Perkins 900 Series — Valve tip clearances (hot or cold):

For the Perkins 900 Series.

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Procedure

1. Inlet ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,20 mm (0.008 in)
2. Exhaust . ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,45 mm (0.018 in)

Source: manual:903 Workshop Manual TPD1345E3.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.