Repair - continued - TM-10-3930-673-340148

TM 10-3930-673-34

3-7. CYLINDER HEAD ASSEMBLY REPLACEMENT/REPAIR (CONT)

NOTE

Grind valve seats for only a few

seconds to avoid making the seats

too wide.

(5)

Grind integral valve seats.

Integral (parent metal) valve seats can be

ground once only. Valve seats that have

been previously ground are marked with

one X. If regrinding of X marked seats is

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necessary, service seats must be

installed.

(a)

Install valves in their designated locations and measure valve depth G. Valve depth is the

distance from valve face to cylinder head surface.

(b)

Record depth G for each valve.

(c)

Lightly grind valve seats to proper

angle. Be careful not to remove too

much material and cause excessive

seat width.

Seat Angle

Intake: 30

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(d)

Reinstall valves in their designated

bores. Measure and record depth H.

(e)

Calculate grinding depth (GD) from

G and H measurements as follows:

Maximum Limit

GD = H - G

GD - 0.010 in. (0.25 mm)

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