Kubota — Valve Clearance Adjustment
Adjustments · Cylinder head / valve train
From a Kubota service manual covering: Hurth HBW 100, Hurth HBW 125, Hurth HBW 150, Hurth HBW 250, Hurth HBW 35, Hurth HBW 50, M-25XPB, M-35B, M-40B. Check it applies to your exact model before use.
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Before you start
- Valve adjustments should be performed by an authorized mechanic.
Procedure
- Remove the valve rocker cover and the glow plugs.
- Rotate crankshaft slowly; watch No.1 intake valve open then close.
- Position the TDC mark in alignment with the notch in the timing hole.
- Adjust the valves in Cylinder No.1.
- Three-cylinder: rotate 240 deg, adjust No.2, rotate 240 deg, adjust No.3.
- Four-cylinder: rotate 180 deg, adjust No.3, then No.4, then No.2.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance (cold): 0.0057 - 0.0072 in. (0.145 - 0.185 mm)
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.