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General Motors 8.1 L Engines Engine Engine

The General Motors 8.1 L Engines is a 8.1 L natural aspiration engine rated at 1800 rpm, producing up to 122.6 kW. It powers generator sets from Kohler and MTU, including the 100REZG and 100-GC6NLT1. It holds 8 L (2.1 gal) of oil and 25.7 L (6.8 gal) of coolant.

8.1 L
Displacement
1800 rpm
Rated speed
122 kW
Gross power
8.0 L
Oil capacity

Engine specifications

Oil capacity8.0 L
Coolant capacity25.7 L
Displacement8.1 L
AspirationNatural Aspiration
Rated speed1800 rpm
Gross power122 kW

Generator sets powered by this engine

2

Shared across brands: Kohler, MTU

Kohler 100REZGMTU 100-GC6NLT1

Troubleshooting

23

Fault codes

CodeMeaning
12Diagnostic Trouble Code (DTC) system operating
DTC 13Oxygen (02) Sensor 1 Circuit Inactive
DTC 14Engine Coolant Temperature (ECT) Sensor Circuit. Low Temperature Indicated.
DTC 15Engine Coolant Temperature (ECT) Sensor Circuit. High Temperature Indicated.
DTC 21Throttle Position (TP) Sensor Circuit. High Signal Voltage Indicated.
DTC 22Throttle Position (TP) Sensor Circuit. Low Signal Voltage Indicated.
DTC 23Intake Air Temperature (IAT) Sensor Circuit. Low Temperature Indicated.
DTC 24Vehicle Speed Sensor (VSS) Circuit Inactive.
DTC 25Intake Air Temperature (IAT) Sensor Circuit. High Temperature Indicated.
DTC 31Governor System Inactive
DTC 32Exhaust Gas Recirculation (EGR) Valve Circuit Inactive.
DTC 33Manifold Absolute Pressure (MAP) Sensor Circuit. High Signal Voltage Indicated.
DTC 34Manifold Absolute Pressure (MAP) Sensor Circuit. Low Signal Voltage Indicated.
DTC 41Ignition Control (IC) H Fault.
DTC 44Knock Sensor (KS) 1 Circuit Inactive.
DTC 51Calibration Checksum Failure.
DTC 54Oxygen (02) Sensor 1 Low Voltage. Lean Exhaust Indicated.
DTC 55Oxygen (02) Sensor 1 Low Voltage. Rich Exhaust Indicated.
DTC 61High Fuel Pressure Indicated.
DTC 62Low Fuel Pressure Indicated.
DTC 63High Fuel Temperature Indicated.
DTC 64Low Fuel Temperature Indicated.
DTC 81Crankshaft Position (CKP) Sensor Circuit Fault.

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

Common questions

What is the oil capacity of the General Motors 8.1 L Engines?

The General Motors 8.1 L Engines engine has an oil capacity of 8.0 liters.

What is the displacement of the General Motors 8.1 L Engines?

The General Motors 8.1 L Engines has a displacement of 8.1 liters.

Which generators use the General Motors 8.1 L Engines engine?

The General Motors 8.1 L Engines powers 2 generator set(s), including Kohler 100REZG, MTU 100-GC6NLT1.