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Perkins 900 Series — To check and to adjust valve tip clearances

Adjustments · Valve train

For the Perkins 900 Series, from the Perkins service manual.

Applies to: Perkins 900 Series CP/CR engine

Procedure

  1. Check clearance with feeler gauges between top of valve stem and rocker lever, engine hot or cold.
  2. Rotate crankshaft until inlet valve of number 1 cylinder has just opened and exhaust valve has not closed completely.
  3. Check/adjust clearance of valve number 3 and number 6.
  4. Set valves of number 2 cylinder as above, check/adjust valve number 2 and number 5.
  5. Set valves of number 3 cylinder, check/adjust valve number 1 and number 4.
  6. Fit rocker cover and tighten cap nuts to 30 Nm metal cover or 20 Nm plastic cover.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Inlet 0,20 mm (0.008 in)
  • Exhaust 0,45 mm (0.018 in)

Source: Perkins 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.

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