5-101.bk Page 37 Friday, March 17, 2006 11:05 AM
200 BENCH PROCEDURES If valve seat insert widths exceed specifications when grinding inserts, use a 15-degree angle grinding stone to obtain correct width. Refer to Figure 5-48. 4. After grinding is completed, thoroughly clean valve seat insert. 5. Determine concentricity of each valve seat insert relative to valve guide. Valve seat runout is to be held within 0.001 (0.025 mm) FIM (Full Indicator Movement), with finished valve guide ID measurements made from snug-fitting arbor (1) and through-mounted into finished valve guides (2). 6. After valve insert has been ground and cleaned, determine position of contact area between valve and valve seat insert. Apply a dab of Prussian Blue to valve face at four points, 90 degrees apart.
Figure 5-47 — Valve Seat Insert Installation 1. Valve seat insert 2. J 38586
3. J 8092
3. Grind inlet/exhaust valve seat inserts to specification. 앫
Inlet valve inserts before November 1996: 30° –0'/+ 30' angle; November 1996 and later: 20° 30' ± 15' angle
앫
Exhaust valve inserts: 30° –0'/+ 30'
7. Lower stem of valve into valve guide and allow valve face to rest on seat insert. Rotate valve 90 degrees on insert. Carefully remove valve without making contact with valve face. Properly ground inserts should have full pattern on insert.
Thoroughly clean cylinder head after checking valve seat inserts and before installing valves.
Always use 30-degree valves with 30-degree valve inserts and 20-degree valves with 20-degree valve inserts. Excessive wear and possible failure will result if 30-degree parts are matched with 20-degree parts.
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