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Waukesha L-1616-GSI Engine Engine

Name: Waukesha L-1616-GSI Engine
Brand: Waukesha

The Waukesha L-1616-GSI is a 25.97 L 12-cylinder engine rated at 1800 rpm, producing up to 493.12 kW. It powers generator sets from Cummins/Onan, including the WF series and YB17/1.

Also known as: Waukesha L-1616-GSI

Part of the Waukesha L-1616 engine family — 3 variants share parts & fitment.

25.97 L

Displacement

Cylinders

1800 rpm

Rated speed

493 kW

Gross power

Engine specifications

Displacement	25.97 L
Cylinders	12
Rated speed	1800 rpm
Gross power	493 kW

Generator sets powered by this engine

Cummins/Onan WF seriesCummins/Onan YB17/1

Common problems

Overspeed lamp lights - no fault condition exists.
Fix: Replace overspeed circuit board.
Overcrank fault lamp lights and engine stops cranking after approximately 75 seconds.
Fix: See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset the engine monitor by moving run-stop-remote switch to stop position, and depressing reset switch. PENN STATE. Move and hold run-stop-remote switch to OFF. Press reset, release and move switch to ON.
Overcrank fault lamp lights after engine has run for approximately 75 seconds.
Fix: Replace start-disconnect circuit board.
Low oil pressure lamp lights after engine is running.
Fix: Check: a. Oil level - engine will shut down after approximately 12-1/2 seconds if oil pressure is low.
Low oil pressure fault lamp lights - no fault condition exists.
Fix: Be certain that no fault condition exists. Disconnect lead 30 from T B l l inside control box (refer to wiring diagram). If low oil pressure lamp still lights, remove and replace engine monitor plug-in printed circuit board.
High engine temperature lamp lights as soon as engine starts.
Fix: Check for defective sensor or actual high temperature condition.
High engine temperature lamp lights after engine is running.
Fix: Check for: a. Defective thermostat/thermostats. b. Low coolant level. c. Defective high engine temperature sensor.
Fault lamp lights immediately after engine starts.
Fix: Check for: a. overspeed condition as engine starts. b. high temperature condition. c. faulty high engine temperature sensor or overspeed switch. d. faulty starter disconnect.
Fault lamp lights and engine stops cranking after approximately 75 seconds.
Fix: See engine service manual for troubleshooting fuel system, ignition system, etc. After correcting problem, reset the engine monitor by holding run-stop-remote switch in stop position, and depressing reset switch. Release and return to run position.
Fault lamp lights afterengine is running.
Fix: Check the following: a. Oil level-engine will shut down after approximately 12-1/2 seconds if low oil pressure sensor does not open. b. Oil pressure sensor may be defective. c. High engine temperature - caused by low coolant level, faulty thermostat, etc. d. Faulty high engine temperature sensor. e. Faulty starter disconnect.
Fault lamp lights - no fault condition exists.
Fix: Be certain that no fault condition exists. Disconnect lead 30 and 31 from T B l l inside control box (refer to wiring diagram). If fault lamp still lights with leads disconnected, remove and replace engine monitor plug-in printed circuit board.

Compiled from service & troubleshooting documentation across every generator set that uses the Waukesha L-1616-GSI.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	Onan OE 987-061		987-061	125 hr	PartsGeek
Fuel filter	Onan OE 987-043		987-043	125 hr	PartsGeek
Oil filter			987-060	1000 hr	PartsGeek
Belt	Timing belt		987-125	4000 hr	PartsGeek
Coolant	Glycol-based coolant with rust inhibitor	60.0 L	—	3000 hr
Oil	SAE 30 or SAE 40	21.0 L	—	500 hr

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

Parts cataloged across the Waukesha L-1616 family

110

Part #	Description	Category
302P640	Ammeter, AC (Check Ammeter Scale - Select According to Rating)	ammeter
302P641	Ammeter, AC (Check Ammeter Scale - Select According to Rating)	ammeter
302P642	Ammeter, AC (Check Ammeter Scale - Select According to Rating)	ammeter
308PI38	Ammeter, Charge (30-0-30)	ammeter
332A795	Ammeter, Charge (30-0-30)	ammeter
A956	2-12 VOLT BATTERIES	battery
332AI006	Block, Terminal	block
332AI009	Block, Terminal	block
I93AI12	Block, Terminal (20-Place)	block
301D2903	Box, Control	box
130-0465	Brace	brace
130-0466	Brace	brace
301A2393	Bracket, Relay Mounting	bracket
322P69	Resistor. Fixed 50-Ohm, 10 Watt	bracket
110-1168	Bracket & Nipple Assembly	bracket_nipple
505-0270	Bushing, Reducer (2 x 1-1/4")	bushing_reducer
503-0059	Clamp	clamp
330A5	Cover - BOI	cover
505-0453	Elbow (90° )	elbow_90
130-0740	Flange Assembly	flange_assembly
301C2906	Frame. Control Panel Mounting	frame
A955	Fill pipe for underground fuel tank	fuel_tank
193B112	Gauge, Water Temperature	gauge
193B194	Gauge, Oil Pressure	gauge
302A6I	Gauge, Oil Pressure	gauge
502-0391	Adapter, Hose	hose
503-0359	Hose (1-5/8" I.D. x 3 ' )'	hose
503-0512	Hose (2-7/8" I.D. x 18" )	hose
322P74	Knob, Rheostat	knob
322-17	Relay, Emergency Latch	lamp
322-81	Lamp, Panel	lamp
322P73	LAMP, FAULT	lamp
307A655	Limiter, Cranking	limiter
309-0243	Valve, Marsh (1-1/4" )	marsh_valve
302B213	Meter, Frequency (60 Hertz)	meter
302B234	Meter, Frequency (50 Hertz)	meter
302P465	RUNNING-TIME METERS 120-240V (1PH)	meter
302P466	For 220/380-V, 3-Ph, 60-Cycle (Model H)	meter
302P467	For 277/480-V, 3-Ph, 60-Cycle	meter
302P468	For 120/208-V,120/240-V, & 347/600-V 3PH. 50 Cy!. (825-Ohm, 75-Watt)	meter
302P469	For 220/380-V, 3Ph. 50-Cycle	meter
302P470	For 277/480-V, 3-Ph, 50-Cyclo (5-P!)	meter
304A262	Relay, Start-Disconnect	monitor
402A70	Mount, Rubber - Control Box.Frame	mount
307-0844	Valve, Solenoid	nipple
505-0328	Nipple ( 3 x 6 " )	nipple
505-0604	Nipple (3 x 9-3/4" )	nipple
505-0615	Nipple (3 x 24" )	nipple
505-0437	Nipple, Half (1-1/4 x 4")	nipple_half
130-0687	Standpipe	other_service
232A90	Shim (0.020 inch thick, 2 x 3 gauge metal)	other_service
232AI489	As Is	other_service
232AI817	Onan OE Filter	other_service
301A1914	Bracket, Panel Stop	other_service
302P421	AC VOLTAGE RESISTOR METERS 600V	other_service
302P422	302P423	other_service
307-0839	Valve, Solenoid	other_service
30ID2I24	Panel Only, Lower Control Bracket, Time Delay Relay Mounting Switch (Run-Stop-Remote)	other_service
323-52	Breaker, Safety - 12 Volt 45 Second 3 Terminal	other_service
501-0186	Line, Flexible	other_service
501-0187	Line, Flexible	other_service
504-0003	Screw, Self-locking (5/16-18 x 1-1/4“)	other_service
504-0062	504-005 I	other_service
505-0004	Nipple, Pipe (1.0 x 1.50)	other_service
505-0041	Elbow, Pipe ( 1 " x 90°)	other_service
505-0088	Nipple, Pipe (1 x 4-1/2")	other_service
505-0178-	Nipple; Half	other_service
505-0258	Nipple (1-1/4 x 3")	other_service
505-0394	Bushing, Reducer (2 x 1")	other_service
505-0669	Tee	other_service
505-0679	Nipple (3 x 12" )	other_service
800-0091	3 Pole	other_service
850-0040	Base, Oil	other_service
850-0060	Washer, Lock - Spring	other_service
862-0001	Stud (1/4-20x3.12)	other_service
862-0005	Nipple, Pipe - Close Plug, Pipe - Square Head Clamp	other_service
F-115	Parts and Service Center Folder	other_service
TB12	Level 2 Power Module	other_service
TB21	TERMINAL BLOCK	other_service
301C2908	Panel. Control	panel
301C2915	Panel, Control	panel
304A305	Panel Only, Lower Cont.	panel
301A2905	Plate. Control Box - Side	plate
301B2904	Plate. Control Box - Top	plate
308-3	Plate, On-Off Switch	plate
322-73	Receptacle, Panel Lamp	receptacle
332AI005	Strip, Terminal Block Marker	receptacle
307A899	Relay, Oil Pressure	relay
307B904	Relay, Time Delay, Low Oil Pressure Switch	relay
307P820	Relay, Adjustabe Start Disconnect & Crankshaft Limiter	relay
320B259	Relay, Cranking	relay
304A446	Resistor. 150-Ohm, lOWatt	resistor
304A66	Harness Assembly, Engine to Control	resistor
322-65	Resistor. Adjustable - 45,000 Ohm, lOWatt (277/480 V o l t )	resistor
308-13	Rheostat, Voltage Adjustment	rheostat
302A61	Ammeter, Charge	sensor
308-2	Switch, Panel Light	sensor
307P778	Spring, Relay Holddown	spring
337-44	Strap, Ground	strap
332AI134	Strip,. Terminal Block Marker	strip
I93BI94	Strip, Marker (Ground. B-t-, Remote)	strip
308P138	Switch, Remote-Stop-Engine Run - Begin Spec "M".	switch
308P139	Switch, Voltage & Current Selector	switch
30IAI685	Switch, Panel Light	switch
309P253	THEHCOSTAT	thehcostat
333PI3B	TheHCostat	thehcostat
302B645	Transformer, Current (Check Transformer Nameplate - Select According to Rating)	transformer
302P643	Transformer, Current (Check Transformer Nameplate - Select According to Rating)	transformer
302P644	Transformer, Current (Check Transformer Nameplate - Select According to Rating)	transformer
315B292	Transformer, Potential (120/208 V o l t Plants)	transformer

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the displacement of the Waukesha L-1616-GSI?

The Waukesha L-1616-GSI has a displacement of 25.97 liters with 12 cylinders.

Which generators use the Waukesha L-1616-GSI engine?

The Waukesha L-1616-GSI powers 2 generator set(s), including Cummins/Onan WF series, Cummins/Onan YB17/1.

How often should you change the oil in the Waukesha L-1616-GSI?

The Waukesha L-1616-GSI oil change interval is every 500 hours.

What is a common problem with the Waukesha L-1616-GSI engine?

A commonly reported issue on generators using the Waukesha L-1616-GSI is: Overspeed lamp lights - no fault condition exists.. Fix: Replace overspeed circuit board..