Kubota — Measuring Compression Pressure
Testing & diagnosis · Cylinder
From a Kubota service manual — check it applies to your exact model before use.
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Before you start
- Always use a fully charged battery for performing this test.
Procedure
- After warming up the engine, stop it and remove the air cleaner, muffler and all nozzle holders.
- Install a compression tester (Code No. 07909-30204) to the nozzle holder hole.
- Set the speed control lever at the stop position and run the engine at 200 to 300 rpm with the starter.
- Read the maximum pressure; measure more than twice.
- If below allowable limit, apply oil to the cylinder wall and measure again.
Tools required
- Compression tester (Code No. 07909-30204) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Factory spec 29 to 33 kgf/cm2 (2.84 to 3.23 MPa)
- Allowable limit 23 kgf/cm2 (2.25 MPa)
- Variances in cylinder compression values should be under 10 %
Source: Kubota 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.