Repair - continued - TM-10-3930-673-340151

TM 10-3930-673-34

NOTE

Grind service seats for only a few

seconds only to avoid making them

too wide.

(d)

Grind service valve seats lightly to

ensure proper seat angle.

Seat Angle

Intake: 30

TR00620

(e)

Install valves in their designated

locations and measure depth I.

Limit

I Depth: 0.039 - 0.060 in.

(1 - 1.52 mm)

TR00623

(f)

Apply a light coat of valve lapping

compound to each valve and lap

valve to its companion service seat.

(g)

Remove valves from cylinder head

and clean grinding compound from

valves and service seats.

TR00624

(h)

Measure width of service seats.

Valve Service Seat Width

Range Limit

Point J: 0.060 in.

(1.52 mm)

Point K: 0.080 in.

(2.03 mm)

TR00625

(i)

If service 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 (h)

above.

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