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Cummins/Onan GH-200 Engine

Name: Cummins/Onan GH-200 Engine
Brand: Cummins/Onan

The Cummins/Onan GH-200 is a 1.9 L 1-cylinder naturally aspirated engine rated at 3600 rpm, producing up to 5.18 kW. It powers generator sets from Cummins/Onan, including the G1207bs and Microlite. It holds 0.8 L (0.2 gal) of oil and 0.8 L (0.2 gal) of coolant.

Also known as: Onan GH-200

1.9 L

Displacement

Cylinders

3600 rpm

Rated speed

5 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ

Engine specifications

Oil capacity	0.8 L
Coolant capacity	0.8 L
Displacement	1.9 L
Cylinders	1
Aspiration	naturally aspirated
Rated speed	3600 rpm
Gross power	5 kW

Generator sets powered by this engine

Cummins/Onan G1207bsCummins/Onan GH-200 Cummins/Onan Microlite

How to read your Cummins/Onan engine serial & model number →

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
FAILS TO CRANK	1. Low battery. 2. Poor battery connection. 3. Blown fuse.	1. Check battery electrolyte level. 2. Clean and tighten all battery cable connections. 3. Replace fuse on control panel.
CRANKS SLOWLY	1. Low battery. 2. Poor battery connection. 3. Blown fuse.	1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
CRANKS BUT WONT START	1. Low battery. 2. Poor battery connection. 3. Blown fuse. 4. Electrical load connected.	1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
EXHAUSTING BLACK SMOKE	1. Fuel below genset pickup level in tank. 2. Fuel supply shutoff valve closed. 3. Carbon deposits on spark plug. 4. Low oil level.	1. Check fuel level and open supply valve if necessary. 2. Clean or replace spark plug.
UNIT RUNS THEN STOPS OR STOPS WHEN DRIVING AROUND A CORNER	1. Low on fuel. 2. Low oil level. 3. Excess oil.	1. Check and add fuel if necessary.
UNIT RUNS THEN SURGES	1. Loose or defective spark plug lead. 2. Ignition coil, wiring, or control components defective. 3. Faulty spark plug. 4. Governor out of adjustment. 5. Combustion air preheat malfunction.
CIRCUIT BREAKER TRIPS (GENSET CONTINUES TO OPERATE)	1. Overloaded circuit. 2. Hot weather increasing load.	1. Reduce electrical load.

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

Common problems

UNIT RUNS THEN SURGES
Cause: 1. Loose or defective spark plug lead. 2. Ignition coil, wiring, or control components defective. 3. Faulty spark plug. 4. Governor out of adjustment. 5. Combustion air preheat malfunction.
UNIT RUNS THEN STOPS OR STOPS WHEN DRIVING AROUND A CORNER
Cause: 1. Low on fuel. 2. Low oil level. 3. Excess oil.
Fix: 1. Check and add fuel if necessary.
FAILS TO CRANK
Cause: 1. Low battery. 2. Poor battery connection. 3. Blown fuse.
Fix: 1. Check battery electrolyte level. 2. Clean and tighten all battery cable connections. 3. Replace fuse on control panel.
EXHAUSTING BLACK SMOKE
Cause: 1. Fuel below genset pickup level in tank. 2. Fuel supply shutoff valve closed. 3. Carbon deposits on spark plug. 4. Low oil level.
Fix: 1. Check fuel level and open supply valve if necessary. 2. Clean or replace spark plug.
CRANKS SLOWLY
Cause: 1. Low battery. 2. Poor battery connection. 3. Blown fuse.
Fix: 1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
CRANKS BUT WONT START
Cause: 1. Low battery. 2. Poor battery connection. 3. Blown fuse. 4. Electrical load connected.
Fix: 1. Check battery electrolyte level. 2. Clean and tighten all battery and cable connections.
CIRCUIT BREAKER TRIPS (GENSET CONTINUES TO OPERATE)
Cause: 1. Overloaded circuit. 2. Hot weather increasing load.
Fix: 1. Reduce electrical load.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan GH-200.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			F51757-4	500 hr	Amazon eBay
Fuel filter			FS1756-2	100 hr	Amazon eBay
Oil filter			—	500 hr
Battery	Check the electrolyte level more frequently during hot weather. Maintain the electrolyte level by adding distilled water.		—	150 hr
Belt	Check for any signs of mechanical damage. Start the set and listen for any unusual noises that may indicate mechanical problems.		—	100 hr
Coolant	Check for oil, fuel and exhaust system leaks. Check exhaust system audibly and visually with the genset running.	0.8	—	100 hr
Coolant filter			—
Oil	Change the engine crankcase oil after the first 20 hours of operation. Change the engine oil every 100 hours after the initial oil change.	1.0 quart (0.95 liters)	—	100 hr
Spark plug			—	1000 hr

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

Common questions

What is the oil capacity of the Cummins/Onan GH-200?

The Cummins/Onan GH-200 engine has an oil capacity of 0.8 liters.

What is the displacement of the Cummins/Onan GH-200?

The Cummins/Onan GH-200 has a displacement of 1.9 liters with 1 cylinders.

Which generators use the Cummins/Onan GH-200 engine?

The Cummins/Onan GH-200 powers 3 generator set(s), including Cummins/Onan G1207bs, Cummins/Onan GH-200, Cummins/Onan Microlite.

How often should you change the oil in the Cummins/Onan GH-200?

The Cummins/Onan GH-200 oil change interval is every 100 hours.

What is a common problem with the Cummins/Onan GH-200 engine?

A commonly reported issue on generators using the Cummins/Onan GH-200 is: UNIT RUNS THEN SURGES. Cause: 1. Loose or defective spark plug lead. 2. Ignition coil, wiring, or control components defective. 3. Faulty spark plug. 4. Governor out of adjustment. 5. Combustion air preheat malfunction..