Repair - continued - TM-10-3930-673-340149

TM 10-3930-673-34

(f)

If GD is equal to or less than given

tolerance, identify valve seat with

an X.

(g)

If GD is greater than 0.010 in. (0.25

mm), a service valve seat must be

installed.

TR00622

(h)

With valves in their designated

bores, measure and record depth I.

Depth Limit

I Depth: 0.039 - 0.060 in.

(1 - 1.52 mm)

(i)

If depth I exceeds tolerance limits,

TR00623

replace the valve and check depth I

again.

(j)

Apply a light coat of valve lapping

compound to each valve and lap

each valve to its companion seat.

(k)

Remove valves and clean grinding

compound from valves and seats.

TR00624

(l)

Measure valve seat width.

Valve Seat Width

Range Limit

Point J: 0.060 in. (1.52 mm)

Point K: 0.080 in. (2.03 mm)

TR00625

(m) If valve seat is too wide after

lapping, grind lower seat surface L

using a 60 seat grinder, and upper

seat surface M with a 15 seat grinder until seat width is centered and within specifications

listed in Step (k) above.

3-47