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Yanmar 4TN84E-RK Engine

The Yanmar 4TN84E-RK is a natural aspiration engine rated at 1800 rpm. It powers generator sets from Kohler, including the 15RFOY and 15ROY. It holds 5.8 L (1.5 gal) of oil and 17.8 L (4.7 gal) of coolant.

Also known as: Yanmar 4TN84E-RK

1800 rpm

Rated speed

5.8 L

Oil capacity

On this pageSpecs Generator sets FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	5.8 L
Coolant capacity	17.8 L
Aspiration	Natural Aspiration
Rated speed	1800 rpm

Generator sets powered by this engine

Kohler 15RFOY Kohler 15ROY

How to read your Yanmar engine serial & model number →

Common problems

Unit will not crank
Cause: Weak or dead battery, Reversed or poor battery connections, Defective starter/starter solenoid, Defective start/stop switch (local or remote), Fuse blown in controller, Open in wiring, terminals, pin, circuit board, etc., Defective circuit board
Fix: Recharge or replace battery, Check connections, | Rebuild or replace Test function; replace if defective, Replace fuse; if fuse blows again, check circuit and components, Check continuity, Check circuit board operation
Overspeed OS
Overcrank OC
No battery charging output
Cause: Loose or corroded connections Sulfated or worn-out battery Defective battery charging alternator Loose alternator belt
Fix: Retighten alternator belt Rebuild or replace alternator
No AC output
Cause: Circuit breaker open or defective (if equipped) Circuit breaker tripping due to overload on generator set No battery voltage to voltage regulator during cranking + terminals on regulator Blown voltage regulator fuse Open wiring, terminal, or pin in build-up circuit or voltage regulator circuit Brushes sticking in brush holder or broken brush springs Rotor slip rings dirty or corroded Defective rotor (open, shorted, or grounded windings) Defective stator (open, grounded, or shorted windings) Defective or misadjusted voltage regulator (PBIIIE only) Defective circuit board K4 relay (field flashing) (relay controller only) Defective K1 relay (field flashing) (5-Light Controller only)
Fix: Reset circuit breaker to ON position Check for voltage on line side Reduce load Check for DC voltage. at voltage regulator terminals Replace fuse; if fuse blows again, check voltage regulator and/or stator winding Check continuity Check brush position and condition Check slip ring condition Check voltage and continuity Check voltage and continuity Excite rotor separately and check for AC output Readjust voltage regulator Test/replace relay controller circuit board Test/replace K1 relay
Low Water Temperature LOWT
Low Water Level (LWL) Shutdown LWL
Low output or excessive drop in voltage
Cause: Engine speed too low Generator overloaded Defective voltage regulator Voltage regulator improperly adjusted Loose voltage regulator connections (including stator sensing leads)
Fix: Check engine speed Reduce load Test/readjust voltage regulator Test/readjust voltage regulator Test and/or replace Test and/or replace
Low Oil Pressure (LOP) Shutdown LOP
Low Oil Pressure 38
Instrumentation not functioning properly
Cause: LOOSE INPUT OR INSTRUMENT LEAD CONNECTION AT AC FUSE TERMINAL BLOCK (TB3) OR INSTRUMENT?
Fix: SECURE CONNECTION AT AC FUSE TERMINAL BLOCK (TB3)? REPLACE FUSE; IF FUSE BLOWS AGAIN, REFER TO “FUSES” EARLIER IN THIS SECTION
High generator output voltage
Cause: Engine speed too high Defective voltage regulator Voltage regulator improperly adjusted Loose voltage regulator connections (including stator sensing leads)
Fix: Check engine speed Test/readjust voltage regulator Check voltage regulator connections
High Fuel Consumption
Cause: Improper type fuel Clogged or dirty air cleaner element Engine overloaded Improper valve clearance Incorrect fuel injection timing Poor engine compression Fuel leakage
Fix: Use proper fuel Replace air cleaner element Reduce load Check for leakage at fuel tank, fuel lines, connections, etc.
High Engine Temperature (HET) Shutdown HET
High Engine Temperature 36

Compiled from service & troubleshooting documentation across every generator set that uses the Yanmar 4TN84E-RK.

Service intervals

Item	Action	Hours	Months	Notes
Fuel level	Check			First service — Before Starting; schedule column X-marks not legible in source. Columns are: Before Starting / After 50 Hrs.-1 Month / Every 100 Hrs.-3 Months / Every 300 Hrs.-6 Months / Every 500 Hrs.-Yearly

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Fan belt tension (deflection)	0.4-0.6 (10-5)	in. (mm)
Gap	Magnetic pick-up air gap	0.030 in. (0.76 mm) +/-0.010 in. (0.25 mm)	in. (mm)
Gap	Speed Sensor to actuator air gap	0.030 in. (0.76 mm) +/-0.010 in. (0.25 mm)	in. (mm)
Gap	Speed sensor air gap	0.020	in. (0.508 mm)
Gap	Speed sensor air gap between sensor and sensing lobe	0.020	in (0.508 mm)	rotor positioned with lobe below sensor
Injection timing	Timing (B.T.D.C.)	16 +/- 1	degrees	B.T.D.C.
Other	1TS thermal switch timeout	30-60	seconds
Other	Controller fuse (Basic and Meter Box models)	10	amp
Other	Cool-down period	5	minutes
Other	Cranking cycle standard off time	10	seconds
Other	Cranking cycle standard on time	10	seconds
Other	Fuel solenoid current, pull-in / hold	50 Amps pull-in; 1.0 Amp hold	Amps
Other	Fuse protecting CR and 1CR relay contacts	15	amp
Other	High temperature shutdown time (NFPA)	3-5	seconds
Other	High temperature shutdown time (basic/meter box)	10-20	seconds
Other	High water temperature lamp light time (Fast Check test)	3-6	seconds
Other	Low oil pressure lamp light time (Fast Check test)	20-60	seconds
Other	Low oil pressure shutdown time (NFPA)	20-30	seconds
Other	Low oil pressure shutdown time (basic/meter box)	10-20	seconds
Other	NFPA controller fuse	3	amp
Other	Overcrank shutdown time (NFPA)	45-70	seconds
Other	Overcrank shutdown time (basic/meter box)	40-60	seconds
Other	Overcrank shutdown, 5-Light controller	45 seconds continuous cranking or 75 seconds cyclic cranking; 15 seconds if locked rotor	seconds
Other	Overcrank shutdown, relay controller	30-60 seconds continuous cranking	seconds
Other	Preheat switch duration	15-20	seconds
Pressure	Anticipatory Low Oil Pressure switch closes	below 8	psi (55 kPa)
Pressure	Engine oil pressure	43-57	psi (294-392 kPa)
Pressure	Fuel injection pressure	2844	psi (19609 kPa)
Pressure	Low Oil Pressure shutdown	7.1	psi (49 kPa)
Resistance	Cold exciter field resistance (RZ)	35	ohms ±10%	cold
Resistance	Cold rotor resistance (RY)	19.2	ohms ±10%	cold
Resistance	Cold rotor resistance (RZ) 22.5kW	3.3	ohms ±10%	cold
Resistance	Cold rotor resistance (RZ) 32.5kW	2.4	ohms ±10%	cold
Resistance	Cold rotor resistance (RZ) 47.5kW	2.9	ohms ±10%	cold
Resistance	Cold rotor resistance — 22.5 kW (Brushless RZ)	3.3	ohms	cold, ±10%
Resistance	Cold rotor resistance — 32.5 kW (Brushless RZ)	2.4	ohms	cold, ±10%
Resistance	Cold rotor resistance — 47.5 kW (Brushless RZ)	2.9	ohms	cold, ±10%
Resistance	Exciter armature winding AC1 to AC2	0.5-0.75	ohms
Resistance	Exciter armature winding AC1 to AC3	0.5-0.75	ohms
Resistance	Exciter armature winding AC2 to AC3	0.5-0.75	ohms
Resistance	Exciter armature winding resistance (AC1-AC2, AC2-AC3, AC1-AC3)	.5-.75	ohms
Resistance	Exciter field resistance (ohmmeter across F1 and F2)	35	ohms	cold exciter field, ±10%
Resistance	Fuel solenoid hold coil (black-red leads)	11-13	ohms	solenoid disconnected from engine harness
Resistance	Fuel solenoid pull-in coil (black-white 14P leads)	0.12-0.26	ohms	solenoid disconnected from engine harness
Resistance	K1, K2, K3, K4 relay coil (controller circuit board)	approx. 400	ohms	R x 10 scale
Resistance	K20 relay coil (starter solenoid)	3-4	ohms
Resistance	Oil pressure sender resistance at 0 psi/kPa	227-257	ohms
Resistance	Oil pressure sender resistance at 100 psi (690 kPa)	21-50	ohms
Resistance	Rotor resistance	2.5-3.1	ohms	room temperature
Resistance	Rotor resistance	3.5-4.3	ohms	room temperature
Resistance	Rotor resistance	5.1	ohms	room temperature
Resistance	Rotor resistance (Static RY, ohmmeter across slip rings)	19.2	ohms	cold rotor, ±10%
Resistance	Stator resistance leads 1-2, 3-4	0.07	ohms	cold, room temperature
Resistance	Stator resistance leads 1-2, 3-4	0.13	ohms	cold, room temperature
Resistance	Stator resistance leads 1-2, 3-4	0.17	ohms	cold, room temperature
Resistance	Stator resistance leads 33-44	0.17	ohms	cold, room temperature
Resistance	Stator resistance leads 55-33	1.1	ohms	cold, room temperature
Resistance	Stator resistance leads 55-33	1.3	ohms	cold, room temperature
Resistance	Stator resistance leads 55-33	2.2	ohms	cold, room temperature
Resistance	Water temperature sender resistance at 100 degrees F (38 degrees C)	450 +/-10%	ohms

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Notes
Coolant	50% ethylene glycol / 50% clean, softened water	Permanent-type coolant meeting specifications		Prevents freezing to -34 degrees F (-37 degrees C). Do not use alcohol or methanol antifreeze. Cooling system capacity: 2 gal. (7.6 L) 6ROY/6RFOY and 10ROY/10RFOY; 4.7 gal. (17.8 L) 15ROY/15RFOY. Maintain level approx. 3/4 to 1-1/2 in. (19-38 mm) below radiator filler neck seat when cold.
Coolant	50% ethylene glycol and 50% clean, soft water		above -37°C	Recommended to inhibit corrosion and prevent freezing to -34°F (-37°C). Maintain coolant level one-half to one inch below top of filler neck.
Engine oil	CC or CD (API)	API CC, CD/CC or CC		Select SAE grade per Figure 3-1 engine oil selection chart (SAE 10W, 20W-20, 30, 40) for operating temperature range -30 to 40 degrees C (-20 to 104 degrees F). Oil capacity with filter: 3.6 qts. (3.4 L) 6ROY/6RFOY; 5 qts. (4.7 L) 10ROY/10RFOY; 6.1 qts. (5.8 L) 15ROY/15RFOY. Avoid mixing different brands.
Fuel	No. 2-D diesel	ASTM D975 (Federal Specification W-F-800a); DIN 51 601; BS2869 Class A1 or A2		Sulphur content less than 0.5%; sediment and water not to exceed 0.1%; cetane number greater than 45; pour point at least 10 degrees F (5.6 degrees C) below lowest outside air temperature. Never store in galvanized containers.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
ANTIC. HIGH WATER TEMP.	Anticipatory High Water Temperature	Lamp lights if engine coolant temperature approaches shut-down level.	Warning	Check coolant level and cooling system.
ANTIC. LOW OIL PRESS.	Anticipatory Low Oil Pressure	Lamp lights if engine oil pressure approaches shut-down level.	Warning	Check engine oil level and oil pressure.
BAT. HIGH VOLTS	Battery High Volts	Lamp lights if battery or charging voltage exceeds normal (about 15 Volts); also lights if overvoltage occurs due to battery charger malfunction while set is not operating.	Warning	Check battery charger and charging system.
BAT. LOW VOLTS	Battery Low Volts	Lamp lights if battery or charging voltage drops below normal (about 11 Volts); also lights if undervoltage occurs due to battery or charger malfunction while set is not operating.	Warning	Check battery and charging system.
EMERG. STOP	Emergency Stop	EMERG. STOP button pushed.	Shutdown	Reset emergency stop.
Emergency Stop	Emergency stop activated	Emergency stop switch activated, or switch disconnected from controller terminals TB1-1 or 1A.	Shutdown	Correct cause, reset emergency stop switch by replacing glass face, toggle master switch OFF/RESET then RUN or AUTO
HIGH TEMPERATURE	High Water Temperature	Shut-down occurs 10-20 seconds after fault (Basic and Meter Box); 3-5 seconds after fault (NFPA).	Shutdown	Activate water temp reset switch to reset 1TS contacts.
High Engine Temperature	HET lamp lights	Engine coolant temperature above 230 degrees F (110 degrees C). Cooling system malfunction.	Shutdown	Check coolant level, fan belt, radiator obstructions; allow engine to cool; reset controller
LOW FUEL	Low Fuel	Lamp lights if fuel tank level approaches empty.	Warning	Check fuel supply.
LOW OIL PRESSURE	Low Oil Pressure	Shut-down occurs 10-20 seconds after fault (Basic and Meter Box); 20-30 seconds after fault (NFPA).	Shutdown	Activate Oil Press. reset switch to reset 1TS contacts.
LOW WATER TEMP.	Low Water Temperature	Lamp lights if optional engine block heater is not working and/or temperature may be too low (below 60°F, 16°C) for 10-second startup.	Warning	Check block heater and coolant temperature.
Low Oil Pressure	LOP lamp lights	Engine oil pressure drops to 7.1 psi (49 kPa).	Shutdown	Check engine lube oil level and oil pressure; correct cause; reset controller
Low Water Temperature/Auxiliary	LWT/AUX lamp lights	Engine coolant below safe range in radiator; also emergency stop, overvoltage, high oil temperature, low coolant level, or customer auxiliary shutdown input.	Shutdown	Add coolant to specified level; reset controller
OVERCRANK	Overcrank	Shut-down occurs if engine does not start after 40-60 seconds of cranking (Basic and Meter Box); 45-70 seconds of cyclic cranking (NFPA).	Shutdown	Activate overcrank reset switch to reset 1TS contacts; check fuel supply and starting system.
OVERSPEED	Overspeed	Unit shuts down immediately; OS contacts on regulator board close and energize SDR shut-down relay.	Shutdown	Activate overspeed reset switch to deenergize SDR relay.
OVERVOLTAGE	Overvoltage	Voltage exceeds nominal by 15% or more for approximately one second.	Shutdown	Activate overvoltage reset switch to deenergize SDR relay.
Overcrank	Overcrank lamp lights	More than 45 seconds of continuous cranking or 75 seconds cyclic cranking (5-light); 30-60 seconds (relay). Locked rotor stops cranking after 15 seconds.	Shutdown	Check engine fuel supply; wait for complete stop; reset controller
Overspeed	Overspeed lamp lights	Governed frequency in excess of 70 Hz (50 and 60 Hz models).	Shutdown	Check governor and engine speed; reset controller
Overvoltage	Overvoltage shutdown (if equipped)	Output voltage 15% above nominal voltage for one second or longer.	Shutdown	Check voltage regulator and connections; reset controller
SWITCH OFF	Switch Off	Generator Main Switch in CENTER OFF position. Lamp flashes.	Info
SYSTEM READY	System Ready	Generator Main Switch in AUTO or TEST and no faults sensed.	Info

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

4-Lead Voltage and Frequency Adjustment Procedure adjustment

⚠ Hazardous voltage; do not touch voltage regulator heat sink when testing.

Tools: Voltmeter, Frequency meter

Stop generator set; disconnect engine starting battery, negative lead first.
Select desired voltage connection and connect leads according to the diagram.
Turn voltage, Volts/Hz, and stability pots fully counterclockwise; turn remote rheostat to mid-point.
Reconnect battery; move generator master switch to RUN to start generator set.
Rotate voltage adjustment pot until desired output voltage is achieved.
Rotate stability pot clockwise until minimum light flicker is obtained.
Adjust engine speed to desired cut-in frequency (factory setting 57.5-58 Hz for 60 Hz models).
Rotate Volts/Hz adjustment pot clockwise until voltage level begins to drop.

Fuel Solenoid Linkage Adjustment adjustment

⚠ Improper adjustment may cause burn-out of the pull-in coil.

Remove linkage to allow fuel solenoid plunger to be manually compressed.
With solenoid fully compressed, align linkage and check injection pump lever travel.
Fuel solenoid should fully compress and injection pump lever should be 1/16 in. (1.6 mm) before lever contacts internal stop.
If alignment is not correct, check linkage and mounting brackets.
Loosen locknuts and adjust ball joint length in or out to attain proper alignment.
Tighten locknuts.

Voltage Regulator Board Calibration adjustment

⚠ High voltage is present at regulator board P1 connector and terminal strip when set is running.

⚠ Do not exceed 285 Volts when adjusting Pot. 2; regulator board damage may result.

Tools: AC voltmeter, 0-300 V AC, ±0.5%, Frequency counter, 45-75 Hz, ±1%, Potentiometer adjustment tool or small blade screwdriver, Load bank (for boards with Pot. 4 — Load Shed)

Disconnect generator from load; place main switch OFF and lift enclosure cover.
Check wire jumpers on regulator board and arrange per Table 3-1/3-2 (J1, J2, J3).
For single-phase connection, lift lead V9 from controller board terminal strip and insulate.
Adjust external voltage adjustment potentiometer to approximate midpoint of range.
Connect AC voltmeter and frequency counter between leads V7 and V8.
Break adjustment seals on Pots. 1, 2 and 3.
Turn Pot. 1 full clockwise and Pot. 2 full counterclockwise.
Start generator set with no load.
Adjust Pot. 2 (Volt Adj.) for the specified output voltage.
Observe LED; if flickering, alternately adjust Pot. 3 and Pot. 1 until steady glow.
Perform overvoltage shutdown check and adjustment (Pot. 6) per 50/60 Hz limits.
Perform overspeed shutdown check and adjustment (Pot. 5) per 50/60 Hz limits.
On NFPA models, check voltage adjustment range (at least ±10 Volts).
Seal Pots. 1, 2 and 3 with insulating varnish.

Voltage Regulator Calibration adjustment

⚠ DANGER OF ELECTROCUTION! High voltage present when set is running.

Tools: AC voltmeter 0-300 V, Frequency counter 45-75 Hz, Potentiometer adjustment tool

Disconnect generator from load. Place main switch OFF.
Check wire jumpers on regulator board per Table 3-1.
For single-phase, lift lead V9 and insulate.
Connect AC voltmeter and frequency counter between V7 and V8.
Start generator with no load.
Adjust Pot. 2 for specified output voltage.
Observe LED; adjust Pot. 3 and Pot. 1 for steady glow.
Seal pots with insulating varnish.

Brush, Spring and Holder Checks (Static RY Models) diagnostic

Tools: Ohmmeter

Disconnect V7, V8 and V9 from terminal strip and insulate.
Disconnect load leads and insulate (separately excite under no load).
Disconnect brush leads F1 and F2 at quick disconnect.
Check brush assembly for weak springs, loose holder, sticking brushes or improper alignment.
Check continuity between quick disconnect point on each brush lead and its adjacent slip ring; repair or replace if faulty.

Fast Check Connection (NFPA Controller Tray) diagnostic

⚠ See Safety Precautions before making any battery connections.

Tools: Fast Check and harness (A-291930 and 269955), Variable low voltage DC power supply, 0-50 Volt, 3 amp minimum, Stopwatch

Unplug harness connector inside meter box.
Connect Fast Check Harness to harness connector inside meter box (connectors are keyed).
Push wiring harness connector onto plug at top of Fast Check.
Move Generator Main Switch on controller to OFF.
Move Fast Check engine switch to OFF.
Clip red (+) and black (-) harness leads to 12-Volt battery or DC power supply.

Regulator Board Test diagnostic

⚠ HIGH VOLTAGE! Potential danger of electrocution.

Tools: 208-240 Volt AC power source, On-Off switch, SCR module (pre-tested), 120 or 240 Volt AC light bulb and socket, Jumper wires

Connect regulator board to good SCR module.
Wire 120/240-Volt AC light bulb across (+) and (-) of SCR module.
Wire on-off switch in series with AC power source.
Wire 208-240 Volts to V7 and V8.
Close switch to apply power; lamp should light.
Adjust Pot. 2 clockwise for max intensity, counterclockwise to extinguish.

SCR Module Test diagnostic

⚠ The SCR module may be damaged if the negative (-) lead of the battery is not connected to the POSITIVE (+) pin.

Tools: Ohmmeter (RX1 scale), 12-volt DC source, 100-500-ohm resistor, 12-volt lamp, Momentary jumper

Connect ohmmeter from (+) to (-): high resistance one direction, low the other.
Connect ohmmeter from AC1 to (+): high resistance both directions; repeat for AC2.
Connect ohmmeter from AC1 to (-): high in one direction, low in the other; repeat for AC2.
G1 to (+) should read low one direction, higher the other; repeat for G2.
Replace SCR module if any check is faulty.
Connect negative (-) lead from DC source to positive (+) pin on SCR module.
Connect positive (+) lead from DC source, with lamp in series, to AC1 pin; lamp should not glow.
Momentarily connect jumper with resistor in series from positive of DC source to G1 pin; lamp should glow and continue glowing.
Repeat with lamp connected to AC2 pin and jumper to G2 pin.

Separate Excitation Test diagnostic

⚠ Hazardous voltage; perform electrical service only as prescribed in equipment manual.

Tools: DC ammeter, 12-Volt automotive battery, 10 Amp fuse

Disconnect all leads from voltage regulator.
Connect DC ammeter, 10 Amp fuse, and 12-Volt automotive battery to positive and negative brush leads.
Note and record ammeter reading (battery voltage divided by specified rotor resistance).
Start engine and check ammeter remains stable; increasing or unstable reading indicates rotor fault.
Check for AC output across stator leads and compare to Section 10 Specifications.
If rotor and stator test good, voltage regulator is probably defective.

Separately Excite — Brushless Models (RZ) diagnostic

Tools: Voltmeter, Ammeter

Disconnect and insulate V7, V8, V9, VO and V4 from terminal strip; disconnect and insulate L1, L2 and L3.
Disconnect exciter leads F1 and F2 at quick disconnect.
Place voltmeter across F3 and F4; connect ammeter in series with F3.
Start unit and read battery voltage; ammeter should read 4/10 of 1 amp.
If voltage is not present, problem is in controller; if current is high or low, problem is in the exciter field.
Check L1, L2, L3, V7, V8, V9, VO and V4 with a voltmeter for output (25-35 volts).
If there is output, check the Automatic Voltage Regulation (AVR) circuit.

Separately Excite — RY Models diagnostic

⚠ HIGH OUTPUT VOLTAGE DURING TESTS MAY ENDANGER HUMAN LIFE OR DAMAGE EQUIPMENT!

Tools: 12-volt battery, DC ammeter

Disconnect and insulate L1, L2, L3, V7, V8, V9, VO and V4.
Connect brush leads in series with 12-volt battery and DC ammeter.
Record ammeter reading.
Start unit and observe ammeter.
Ammeter reading should remain same.
Check L1, L2, L3, V7, V8, V9, VO, V4 for AC output.

Separately Excite — RZ Models diagnostic

⚠ EXPLOSIVE GASES! Locate auxiliary battery at least 18 inches above floor.

Tools: Voltmeter, Ammeter

Disconnect and insulate V7, V8, V9, VO and V4.
Disconnect and insulate L1, L2, L3.
Disconnect exciter leads F1 and F2.
Place voltmeter across F3 and F4.
Connect ammeter in series with F3.
Start unit and read battery voltage.
Check L1, L2, L3, V7, V8, V9, VO, V4 for 25-35 volts output.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
100-120	1	Dual voltage connection	LO-L1, LO-L2	Jumper lead is not used in dual voltage systems; L1 and L2 are different phases and must never be connected together.
100-120	1	Single voltage connection LO-L1	LO-L1	60 Hz and 50 Hz. Jumper lead should be placed on the line side of the circuit breaker; recommended for all straight 100-120 Volt systems to help balance load.
110/190	3	4 wire		50 Hz
110/190	3	50 Hz, 110/190 Volt, 3 Phase, 4 Wire
110/220	1	3 wire		50 Hz
110/220	1	50 Hz, 110/220 Volt, 1 Phase, 3 Wire		Multi-voltage wiring diagram — reconnect output leads according to diagram.
110/220	3	4 wire		50 Hz
110/220	3	50 Hz, 110/220 Volt, 3 Phase, 4 Wire
120/208	3	4 wire		60 Hz
120/208	3	50 Hz, 120/208 Volt, 3 Phase, 4 Wire
120/208	3	60 Hz, 120/208 Volt, 3 Phase, 4 Wire
120/240	1	3 wire		60 Hz
120/240	1	60 Hz, 120/240 Volt, 1 Phase, 3 Wire
120/240	3	4 wire		60 Hz
120/240	3	60 Hz, 120/240 Volt, 3 Phase, 4 Wire
220/380	3	4 wire		50 Hz
220/380	3	50 Hz, 220/380 Volt, 3 Phase, 4 Wire
240	3	3 wire		60 Hz
240	3	60 Hz, 240 Volt, 3 Phase, 3 Wire
277/480	3	4 wire		60 Hz
277/480	3	60 Hz, 277/480 Volt, 3 Phase, 4 Wire
all	1	Single-phase units — reconnect lead V9	V9	For single phase units lift V9 from terminal strip and tape, or connect to open terminal next to V4.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Aftermarket parts that fit this engine

129150-32000 FridayParts $102.00 129400-13201 Amazon eBay $19.17 FridayParts $20.00 55W-V FridayParts $8.93 129550-11310 Amazon eBay $13.01 FridayParts $32.75 4TNA78E FridayParts $32.75

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Also used in

Yanmar B5 — Excavator Compact

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Yanmar 4TN84E-RK?

The Yanmar 4TN84E-RK engine has an oil capacity of 5.8 liters.

Which generators use the Yanmar 4TN84E-RK engine?

The Yanmar 4TN84E-RK powers 2 generator set(s), including Kohler 15RFOY, Kohler 15ROY.

What is a common problem with the Yanmar 4TN84E-RK engine?

A commonly reported issue on generators using the Yanmar 4TN84E-RK is: Unit will not crank. Cause: Weak or dead battery, Reversed or poor battery connections, Defective starter/starter solenoid, Defective start/stop switch (local or remote), Fuse blown in controller, Open in wiring, terminals, pin, circuit board, etc., Defective circuit board. Fix: Recharge or replace battery, Check connections, | Rebuild or replace Test function; replace if defective, Replace fuse; if fuse blows again, check circuit and components, Check continuity, Check circuit board operation.