Kubota — Valve Seat Tightness
Testing & diagnosis · Injection nozzle
From a Kubota service manual — check it applies to your exact model before use.
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Procedure
- Set the injection nozzle to a nozzle tester.
- Raise the fuel pressure and keep at 12.75 MPa (130 kgf/cm2, 1849 psi) for 10 seconds.
- If any fuel leak is found, replace the nozzle piece.
Tools required
- Nozzle tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve seat tightness: no fuel leak at 12.75 MPa (130 kgf/cm2, 1849 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.