The General Motors GM8.1L is a 8.1 L engine. It powers generator sets from Cummins/Onan, including the GGLA.
Also known as: General Motors GM8.1L
Part of the General Motors GM8.1L engine family — 2 variants share parts & fitment.
| Displacement | 8.1 L |
|---|
This engine also powers 20 machine(s) on Power Equipment Info.
Compiled from service & troubleshooting documentation across every generator set that uses the General Motors GM8.1L.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | Ground Voltage: 12 Volts, Group Number: 31, Minimum Rating (Cold Soak): 455 CCA @ 0° F (-18° C) | — | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | Check the engine oil level. Keep the oil level near as possible to the dipstick high mark without overfilling. | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| A029A407 | Gasket, Mixer to Adapter | gasket |
| LF16109 | Filter, Oil (Fleetguard) (Not Shown) | oil_filter |
| 963-0601 | PowerCommand Control (2100 Series) | other_service |
| A026D979 | Converter, Catalytic | other_service |
| A026E804 | Muffler | other_service |
| A026F055 | Muffler | other_service |
| A026H163 | Regulator, Fuel | other_service |
| A026H167 | Regulator, Fuel / Regulator, Fuel (Vapor NG/LP) | other_service |
| A026H171 | Regulator, Fuel | other_service |
| A026H173 | Regulator, Fuel | other_service |
| A026H951 | Control, Fuel | other_service |
| A026H952 | Control, Fuel | other_service |
| A028Z105 | Sender, Low Coolant | sender |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The General Motors GM8.1L has a displacement of 8.1 liters.
The General Motors GM8.1L powers 1 generator set(s), including Cummins/Onan GGLA.
A commonly reported issue on generators using the General Motors GM8.1L is: If the engine does not start, the starter will disengage after a specified period of time and the control will indicate an overcrank shutdown.. Fix: To clear a Fail to Start shutdown, place the O/Manual/Auto switch in the O position and press the Fault Acknowledge/Reset button. Wait two minutes for the starter motor to cool and then repeat the starting procedure. If the engine does not run after a second attempt, refer to the Troubleshooting section..