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700- 7012mm 102765-02761 in)

7 05 mm 10 278 in)

b To ease guide removal and reinstallation. and to maintain the correct interference fit. heat the head to 100aC (212°F)

If possible, use an oven to avoid any possibility of head warpage due to uneven heating c Use the appropriate shouldered drive (special tool) to drive the old guide out and the new guide in

Sun4*t0 WKflh

I 8 mm 10071 ml

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d After installing the valve guide, use 7 mm (0 276 in) reamer (special tool) to obtain the proper valve clearance e After fitting the valve guide into the cylinder head, be sure to grind the valve seat, and perform valve lapping The valve must be replaced by a new one 6 Grinding the valve seat a The valve seat is subject to severe wear similar to the valve face Whenever the valve face is resurfaced, the valve seat should also be resurfaced at a 453 angle In addition, if a new valve guide has been installed (without any valve repair), the valve seat should be checked to guarantee complete sealing between the valve face and seat

If the valve seat is obviously pitted or worn, it should be cleaned with a valve seat cutter. Use the 45° cutter, and when twisting the cutter, keep an even downward pressure to prevent chatter marks.

If cutting section "A" of the intake valve seat, use "FLAT" cutter (radius cutter) If cutting section "A" of the exhaust valve seat, use "FLAT" cutter (also radiused)

If cutting section "B". use the 30° cutter.

If cutting section "C", use the 45° cutter.

b Measure valve seat width Apply mechanic s bluing dye (such as Dykem) to the valve face, apply a very small amount of fine grinding compound around the surface of the valve seat, insert the valve into position, and spin the valve quickly back and forth Lift the valve, clean off all grinding compound, and check valve seat width The valve seat will have removed the blueing wherever it contacted the valve face Measure the seat width with vernier calipers It should measure approximately 1 1 mm (0.043 in). Also, the seat should be uniform in contact area. If valve seat width varies, or if pits still exist, then continue to cut with the 45° cutter Remove just enough material to achieve a satisfactory seat.

I 8 mm 10071 ml c If the valve seat is uniform around the perimeter of the valve face, but is too wide or not centered on the valve face, it must be altered Use either the "FLAT". 45°, or 30° cutters to correct the improper seat location in the manner described below

Sun4*t0 WKflh c Insert each ring into the cylinder and push it down approximately 20 mm (0 8 in), using the piston crown so that the ring forms the right angles to the cylinder bore Measure the end gap of the ring with a feeler gauge If the gap is beyond tolerance, replace the whole set of rings

The end gap on the expander spacer of the oil control ring is unmeasureable If the oil control ring rails show excessive gap all three components should be replaced

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