REPAIR INSTRUCTIONS

Valve Seat Insert Removal

Refer to Figure 219.

Valve seat extractor kit PT6391 and collet PT6390-4 are used to remove inlet and exhaust seat inserts.

Collet PT6390-4 is not included in basic kit PT6391.

Refer to Figure 220.

1.Using depth measurement tool (1), measure

This point should be approximately 0.060 inch (1.524 mm) below any angular face on valve seat insert.

Repair Instructions

Use care not to damage any machined surface of the cylinder head.

5.Attach collet to T-handle and shaft assembly.

6.Position collet in valve seat insert so ridge of collet will be inside groove. Turn T-handle to fully expand collet. Refer to Figure 222.

7.Position lifting bridge (3) under crank handle (2). Turn crank handle clockwise to remove insert.

8.Release insert from collet (4) by slightly turning T-handle (1). 222

Refer to Figure 221.

2.Install grinding wheel (2) into grinder (4) and set depth of grinder base (1) to dimension found in preceding step.

3.Secure