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TM 10-4130-239-14
6-2.
CYLINDER BLOCK ASSEMBLY REPAIR (CONT)
19.
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29.
Drive in replacement bushing(s) to same depth as original
bushing.
Ream bushing with bushing guide pilot.
Lubricate reamer
liberally as necessary with oil.
Clean engine of any reaming
debris and other foreign matter.
Obtain exhaust valves and intake valves.
Spread fine lapping compound around all valve faces.
Pull valves
into valve seats very slowly, one valve at a time.
Once each is
fully seated, turn it slowly left to right until it makes several
complete turns.
Push valve out of valve chamber.
Inspect valve seat to ensure valve face has seated uniformly in
valve seat.
If valve or valve seat is worn beyond usable limits or uniform
wear pattern is not present, replace valves and valve seats.
Remove valve seats.
Place crankcase on left cylinder assembly.
Install new intake valve seat(s).
NOTE
Make sure chamfered edge of valve seat goes down
into cylinder.
Using driver, drive new seat until it bottoms.
Seat will be
slightly below cylinder head gasket surface.
6-11
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