Home›Engines›Yanmar 3TN75E-RK

Yanmar 3TN75E-RK Engine

The Yanmar 3TN75E-RK is a natural aspiration engine rated at 1800 rpm. It powers generator sets from Kohler, including the 10RFOY, 10ROY, 6RFOY and 6ROY. It holds 3.4 L (0.9 gal) of oil and 7.6 L (2.0 gal) of coolant.

Also known as: Yanmar 3TN75E-RK

1800 rpm

Rated speed

3.4 L

Oil capacity

On this pageService parts Specs Generator sets Maintenance Filter cross-reference FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Service parts for the 3TN75E-RK

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Air intake

1 required

P533597Air filterfind

Fuel system

1 required

11981055650Fuel filter$10.99eBay

Oil system

1 required

11900535170Oil filter$30.91eBay

Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.

Engine specifications

Oil capacity	3.4 L
Coolant capacity	7.6 L
Aspiration	Natural Aspiration
Rated speed	1800 rpm

Generator sets powered by this engine

Kohler 10RFOY Kohler 10ROY Kohler 6RFOY Kohler 6ROY

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 3TN75E-RK.

Maintenance schedule

Item	Spec	Part #
Air filter		46452	FridayParts $107.00
Fuel filter		11981055650	Amazon Amazon eBay $10.99 eBay $17.99 KuduParts $11.00
Oil filter		11900535170	eBay $30.91 KuduParts $28.00 FridayParts $29.99
Battery	12 Volt, negative ground, 500 Cold Cranking Amps minimum	—
Belt	Fan belt deflection 0.4-0.6 in. (10-5)	—
Coolant	50% ethylene glycol / 50% clean, softened water	—
Oil	CC or CD (API)	—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

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)
Injection timing	Timing (B.T.D.C.)	16 +/- 1	degrees	B.T.D.C.
Other	Fuel solenoid current, pull-in / hold	50 Amps pull-in; 1.0 Amp hold	Amps
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
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	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	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
Resistance	Water temperature sender resistance at 160 degrees F (71 degrees C)	130 +/-10%	ohms
Resistance	Water temperature sender resistance at 220 degrees F (104 degrees C)	47 +/-10%	ohms
Speed	Governor speed, 50 Hz models	1500 rpm full load; 53 Hz (1590 rpm) no load	rpm
Speed	Governor speed, 60 Hz models	1800 rpm full load; 63 Hz (1890 rpm) no load	rpm
Speed	Overspeed shutdown	70 Hz (2100 rpm)	Hz/rpm	50 and 60 Hz models
Speed	Volts/Hz knee frequency (PowerBoost IIIE factory setting)	57.5 Hz (60 Hz models); 47.5 Hz (50 Hz models)	Hz
Temperature	Anticipatory High Engine Temperature switch closes	above 218 +/-7	degrees F (103 +/-4 degrees C)
Temperature	Anticipatory Low Water Temperature switch closes	below 60 +/-5	degrees F (16 +/-8 degrees C)
Temperature	Anticipatory Low Water Temperature switch opens	above 80 +/-5	degrees F
Temperature	High Engine Temperature shutdown	230	degrees F (110 degrees C)
Torque	Cylinder head tightening torque Step 1	24-26	ft. lbs (3.4-3.6 Nm)
Torque	Cylinder head tightening torque Step 1	25-31	ft. lbs (3.5-4.3 Nm)
Torque	Cylinder head tightening torque Step 2	49-52	ft. lbs (6.8-7.2 Nm)
Torque	Cylinder head tightening torque Step 2	54-61.5	ft. lbs (7.5-8.5 Nm)
Torque	Drive disc to flywheel bolt torque	168	in. lbs (19 Nm)
Torque	Drive disc to flywheel nut torque	168	in. lbs (19 Nm)
Torque	Drive disc to rotor bolt torque	540	in. lbs (61 Nm)
Torque	Fan to rotor bolt torque	260	in. lbs (29 Nm)
Torque	Generator adapter to flywheel housing bolt torque	300	in. lbs (34 Nm)
Torque	Generator adapter to flywheel housing bolt torque	324	in. lbs (37 Nm)
Torque	Magnetic pickup actuator to rotor bolt torque	96	in. lbs (11 Nm)
Torque	Overbolt torque	216	in. lbs (24 Nm)
Valve clearance	Valve clearance, exhaust	0.008	in. (0.2 mm)
Valve clearance	Valve clearance, intake	0.008	in. (0.2 mm)
Voltage	Controller TB1 test point voltage	slightly less than 12 Volts DC	Volts DC	FASTCHECK toggle in prescribed position
Voltage	Megohmmeter insulation test voltage (rotor and stator)	500 Volts DC; reading of approx. 500K ohms (1/2 megohm) and higher indicates good	Volts DC / ohms
Voltage	Speed Sensor supply voltage at sensor (wire 24 to wire 2)	9-5 Volts DC (as printed); approx. 7 Volts DC with set running	Volts DC	master switch OFF/OFF-RESET; running

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	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.
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
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 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 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 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

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.

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.

Speed Sensor Test Procedure diagnostic

Tools: DC voltmeter, 12 Volt DC power supply

Remove Speed Sensor from end bracket.
Connect Speed Sensor, voltmeter, and DC voltage source as shown.
Touch sensing surface with a flat piece of iron or steel at least 1/4 cubic inch.
Voltmeter test reading should equal source voltage.
Remove iron or steel from sensing surface; voltmeter should indicate no voltage.
Reinstall Speed Sensor to end bracket using all original hardware.

Resetting Procedure - Fault Shutdown (Relay Controller) maintenance

⚠ See Safety Precautions before proceeding.

Move generator master switch to OFF/RESET until fault lamp goes out.
Disconnect generator set from load with line circuit breaker or transfer switch.
Correct cause of fault shutdown.
Move generator master switch to normal position (RUN or AUTO) for start-up.

Storage Procedure maintenance

Drain oil while still warm from crankcase and refill with proper viscosity oil.
Drain fuel from fuel tank to prevent accumulated moisture.
Check engine coolant protection.
Disconnect battery (negative lead first) and place in storage.
Seal all openings in engine with non-absorbent adhesive tape.
Clean exterior of generator and apply light film of oil to unpainted metallic surfaces.

5-Light Controller Starting (Local and Auto) operation

⚠ Alarm horn will sound whenever generator master switch is not in AUTO position.

For local starting, move generator master switch to RUN position.
For auto starting, move generator master switch to AUTO position.
For cyclic cranking leave TB1-9 open; jumper TB1-2 to TB1-9 for continuous cranking.

5-Light Controller Stopping operation

Disconnect load from generator set and allow it to run without load for 5 minutes.
Move generator master switch to the OFF/RESET position; engine stops.

Emergency Stopping (5-Light Controller) operation

⚠ Emergency Stop Switch(es) are to be used for emergency shutdowns only.

Move generator master switch to OFF/RESET or activate remote emergency stop for immediate shutdown.
LOW WATER TEMPERATURE/AUXILIARY lamp lights and unit shuts down.

Relay Controller Starting Procedure operation

Move controller or remote Start/Stop switch to RUN position until engine starts.
If engine fails to start after cranking 30 seconds, unit stops on overcrank.
Wait for complete stop before attempting restart.
Place switch in RESET/OFF then to RUN position.

Relay Controller Stopping Procedure operation

Run generator set at no load for 5 minutes to allow engine cooldown.
Move controller or remote Start/Stop switch to Off/Reset position.

Resetting Procedure - Remote Emergency Stop operation

⚠ Low Water Temp/Auxiliary lamp lights if master switch is in RUN or AUTO during resetting.

Investigate cause of emergency stop and correct problem(s).
Reset remote emergency stop switch by replacing glass face on switch.
Toggle generator master switch to OFF/RESET and then to RUN or AUTO to resume operation.

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.

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

121250-44901 Amazon eBay $10.17 FridayParts $13.50 719810-23100 FridayParts $92.93 719810-21700 FridayParts $689.99 119810-32000 FridayParts $85.00 129795-49551 Amazon eBay $14.95 FridayParts $29.26 119625-11880 Amazon FridayParts $14.00 119625-11900 Amazon eBay FridayParts $35.56 3TN86 FridayParts $35.56 26106-080602 Amazon eBay $19.42 FridayParts $28.35 129795-01800 Amazon eBay $39.95 FridayParts $26.00 119810-14580 FridayParts $213.64 119810-01730 FridayParts $138.27 119810-01780 Amazon eBay $39.95 FridayParts $32.55 3TN82E FridayParts $9.70 3TN82L FridayParts $14.00 3TNC78E FridayParts $16.99 3TNC80L FridayParts $18.00 4TN82E FridayParts $9.70 SinoCMP $99.00 4TN82L FridayParts $24.35 FP-XP-0020734

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

Filters for this engine

Air filter: Donaldson P533597 Wix 46452 Baldwin PA3557-FN
Fuel filter: Yanmar 11981055650 Donaldson P502166 Wix 33263 Baldwin PF981
Oil filter: Yanmar 11900535170 Donaldson P502051 Baldwin B161-S

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Also used in

John Deere F1145 — Lawn Equipment

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 3TN75E-RK?

The Yanmar 3TN75E-RK engine has an oil capacity of 3.4 liters.

Which generators use the Yanmar 3TN75E-RK engine?

The Yanmar 3TN75E-RK powers 4 generator set(s), including Kohler 10RFOY, Kohler 10ROY, Kohler 6RFOY, Kohler 6ROY.

What oil filter does the Yanmar 3TN75E-RK use?

The Yanmar 3TN75E-RK uses oil filter part numbers Yanmar 11900535170, Donaldson P502051, Baldwin B161-S.

What fuel filter does the Yanmar 3TN75E-RK use?

The Yanmar 3TN75E-RK uses fuel filter part numbers Yanmar 11981055650, Donaldson P502166, Wix 33263.

What air filter does the Yanmar 3TN75E-RK use?

The Yanmar 3TN75E-RK uses air filter part numbers Donaldson P533597, Wix 46452, Baldwin PA3557-FN.

What is a common problem with the Yanmar 3TN75E-RK engine?

A commonly reported issue on generators using the Yanmar 3TN75E-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.