Volkswagen 412 Engine >> COMPRESSION PRESSURE FOR KUBOTA DIESEL ENGINES

Volkswagen 412 Engine >> COMPRESSION PRESSURE FOR KUBOTA DIESEL ENGINES

Compression Pressures For
1970-99 Kubota Diesel Engines

The AERA Technical Committee offers the following information regarding cranking compression specifications for Kubota diesel engines. This information should be referenced anytime the engine is being considered for rebuild or evaluated. To obtain an accurate value of cranking compression, the engine should be operated until normal operating temperature is obtained. If an engine will not start, the cold cranking compression value can be used but it will be 3-10% lower than a hot reading.

Kubota provides seven different adapters to help facilitate the cranking compression test and suggests the following precautions and instructions before testing.

1. Remove the air cleaner and muffler to allow for free flow while spinning engine over.
2. Remove the fuel nozzles from all cylinders and install compression tester of at least 600 PSI.
3. Pull the fuel stop lever, or override the stop solenoid. Turn the engine over with the starter until the maximum pressure is obtained. Crankshaft rotation must be at least 250 RPM.
4. If the pressure is less than the allowable limit, rotate each piston to top dead center (TDC) and inject 1 ml of clean 10W engine oil in each cylinder and retest.
5. If the readings do not improve, suspect the engine valves of leakage, a bent rod or worn pistons and rings.
6. Compression variance between cylinders should be less than 10%.
7. If compression readings are close to the allowable limit specification, the engine may run but it will never develop full horsepower. As much as 25% loss of power should be expected.

Allowable Value
Engine Model(s) Adapter Standard Value Before Rebuild

D600, D640, D662, Z400, Z43
Z482, D722, D905, D1005, V800 E 412- 469 PSI 327 PSI
V1105, V1205, V1305, V1505

Z500, Z600, ZH600, Z751, Z871, D650
D750, D850, D950, D1101, D1102
D1301, D1302, D1402, V1100, V1101 B 412- 469 PSI 327 PSI
V1200, V1501, V1502, V1702, V1902
V2202, S2200, S2600, S2800

ZL600, Z1100 A 412- 469 PSI 327 PSI

A1300 D 412- 469 PSI 327 PSI

D1302DI, D1402DI, V1702DI, V1902DI
V2302DI, F2402DI, F260DI, S2802DI F 412- 469 PSI 327 PSI

D1462DI, D1902DI, F2503DI G or 412- 469 PSI 327 PSI
F2803DI, V2203DI I

D3000, D3200, D3502, V4300
V4302, V4702 C 412- 469 PSI 327 PSI

D1503L-A, D1703A V1903A, F2803 E 512-540 PSI 360 PSI

AC60, OC60, )C95 B 455-469 PSI 360PSI

The AERA Technical Committee

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