Power Solutions International — Engine Compression Test
Testing & diagnosis
From a Power Solutions International service manual — check it applies to your exact model before use.
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Procedure
- Warm up engine until coolant 90°C ±10°C and oil sump 95°C ±10°C.
- Shut off engine and remove all spark plugs.
- Set engine throttle to W.O.T. and secure this position.
- Connect compression gauge to cylinder #1.
- Use engine starter to rotate the engine.
- Release pressure and allow 10 compression strokes until reading stabilizes.
- Record pressure readings.
- Repeat for remaining cylinders.
- Recheck cylinder #1 to verify no change.
Tools required
- Compression gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pressure difference between cylinders should not exceed 14.5 psi
- Oil sump temp should remain above 70°C (158°F) for remainder of test
Source: Power Solutions International service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.