Kubota — Adjusting Injection Timing
Adjustments · Injection pump
From a Kubota service manual — check it applies to your exact model before use.
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Before you start
- Always use the same number of new gasket shims with the same thickness when replacing.
Procedure
- Remove the injection pipes.
- Set the speed control lever to the maximum fuel discharge position.
- Turn the flywheel until fuel fills up to the hole of the delivery valve holder.
- Turn further and stop when fuel begins to flow over again and check punch mark alignment.
- Readjust the timing with shims if out of adjustment.
Tools required
- Shims 0.20 mm, 0.25 mm, 0.30 mm Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injection timing 0.31 to 0.35 rad (18 to 20 deg) before T.D.C.
- Adding or reducing shim (0.05 mm) delays or advances timing approx. 0.0087 rad (0.5 deg)
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.