The Waukesha F1197-GRS1U is a 2.99 L 6-cylinder natural aspiration engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the WC Series.
Also known as: Waukesha F1197-GRS1U
Part of the Waukesha F1197 engine family — 2 variants share parts & fitment.
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
| Displacement | 2.98543 L |
|---|---|
| Cylinders | 6 |
| Aspiration | Natural Aspiration |
| Rated speed | 1800 rpm |
Compiled from service & troubleshooting documentation across every generator set that uses the Waukesha F1197-GRS1U.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | Onan OE Filter | 232AI817 | 400 hr | Amazon eBay | |
| Oil filter | Onan OE Filter | 232AI490 | 400 hr | Amazon eBay PartsGeek $17.97 | |
| Battery | SAE Group 8D (12-volts) | A956 | 400 hr | Amazon eBay | |
| Belt | #18 wire | — | 900 hr | ||
| Coolant | 36.0 gallons | — | |||
| Oil | SAE 20W-50 | 32.0 L | — | 400 hr | |
| Spark plug | Onan OE Spark Plug | — | 1200 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 191B649 | Pulley, Alternator | Alternator |
| 191B690 | Bracket, Alternator Mtg. - Begin Spec 'F' | Alternator |
| 234D70 | Band, Generator - Front Portion (Narrow) | Alternator |
| 332AI89 | Alternator, Charge | Alternator |
| 309A178 | Battery, 24V, 150Ah | Battery |
| 4I6A444 | Positive | Battery |
| 4I6A445 | Negative | Battery |
| A956 | 2-12 VOLT BATTERIES | Battery |
| 232AI808 | Bearing Holder - Anti-Rotation - Begin Spec B | Bearing holder |
| 234D74 | Generator Group (Exciter Portion) | Exciter panel |
| 232AI490 | Engine Oil | Fluid |
| 232AI817 | Onan OE Filter | Fuel filter |
| 505-19 | Bushing, Pipe Reducer (1/2 x 3/8") High Water Temperature Switch (1), Water Temperature Gauge Sender (1) | Oil filter |
| I93A100 | Sender, Water Temp. (Eng. Switch & Sender Unit Only) | Oil filter |
| I93A98 | Sender, Oil Press. (Eng. Unit Only) | Oil filter |
| 204A83 | Ring, Collector | Service part / kit |
| 232AI807 | Rotor Assy., Wound, Inc. Brg., Blower & Drive Assy. | Service part / kit |
| 232AI813 | Spacer, Alternator Mtg. | Service part / kit |
| 232CI394 | Bolt. Place. Gen. Mtg. | Service part / kit |
| 234AI07 | Support, Gen. Mtg. | Service part / kit |
| 321-139 | .0598 " | Service part / kit |
| 321-140 | Holder, Fuse | Service part / kit |
| 332AI817 | Voltage Regulator | Service part / kit |
| 338B242 | Static Exciter | Service part / kit |
| 338B2I3 | Voltage Regulator | Service part / kit |
| 403C575 | Base, Mounting | Service part / kit |
| 4I6A446 | Cable, B a t t . Jpr. | Service part / kit |
| 4I6A96 | Clip. Ene. Cont.Harness | Service part / kit |
| 505-117 | Low Oil Press. Bushing, Rod (1/2 x 3/8") | Service part / kit |
| 505-131 | Bushing, Pipe Reducer (3/4 x 3/8") Radiator Outlet to Drain Valve | Service part / kit |
| 505-98 | Nipple, Close (1/8 x 3/4'') Oil Pressure Tee Mounting | Service part / kit |
| I9IC548 | Regulator, Charge | Service part / kit |
| I9IC550 | Bracket, Alternator | Service part / kit |
| 232AI376 | Rectifier | Rectifier |
| 336AI211 | Lead, Starter ( 14 " Long) | Starter |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
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.
The Waukesha F1197-GRS1U has a displacement of 2.98543 liters with 6 cylinders.
The Waukesha F1197-GRS1U powers 1 generator set(s), including Cummins/Onan WC Series.
The Waukesha F1197-GRS1U uses oil filter part numbers Waukesha 101737A, Donaldson P550117, Wix 51503.
The Waukesha F1197-GRS1U oil change interval is every 400 hours.
A commonly reported issue on generators using the Waukesha F1197-GRS1U is: Generator will not build up voltage. Cause: Circuit breaker in "off" or "tripped" position. Fix: Reset and close breaker.