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Perkins — Bridge Piece Adjustment

A Perkins service procedure — check it applies to your exact model before use.

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Before you start

  • Disconnect the batteries and any other power that can start the engine.
  • The bridge piece must be adjusted before the valve adjustment is made.
  • Check that there is a clearance between the bridge piece and the inlet and exhaust rockers.
  • When the contact is made with the valve, the valve must not move. Only the gap between the valve tip and the bridge piece must be removed.

Procedure

  1. Remove the setscrews (A1). Remove the rocker cover (A2) and discard the cover joint (A3).
  2. Rotate the engine to the required position using the inspection hole (B) in the flywheel housing to find TDC.
  3. Check that there is clearance on both valves.
  4. Loosen the lock nuts on each of the bridge pieces (C2).
  5. Turn the adjuster (C3) out until the fixed side of the bridge piece rests on its valve.
  6. Hold the top edge of the bridge piece (C1) and turn the adjuster screw (C3) down until it contacts the valve.
  7. Tighten the lock nut (C2) to a torque of 50 Nm (35 lbf ft). Do not allow the adjuster screw (C3) to move.

Tools required

  • engine cranking device (part number SE253)

Specs & torque values

  • Lock nut torque: 50 Nm (35 lbf ft)

Source: manual:4006-23 series_TPCD1508-000-en.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.