Kubota — Compression Pressure
Testing & diagnosis · Engine
From a Kubota service manual — check it applies to your exact model before use.
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Before you start
- Variances in cylinder compression values should be under 10 %.
Procedure
- Run the engine until warmed up.
- Stop the engine and disconnect the 2P connector from the stop solenoid.
- Remove the air cleaner, muffler and all injection nozzles.
- Set a compression tester (Code No. 07909-30208) with adaptor to the nozzle hole.
- Keep the engine stop lever at Stop Position.
- While cranking the engine with the starter, measure the compression pressure.
- Repeat steps for each cylinder.
Tools required
- Compression tester 07909-30208 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compression pressure: 3.53 to 3.72 MPa (36 to 38 kgf/cm2, 512 to 540 psi) at 290 min-1 (rpm)
- Allowable limit: 2.55 MPa (26 kgf/cm2, 370 psi)
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.