TM 5-3805-281-24-2
Cylinder Head and Valves
Valve Seat--Specification
Angle ........................................................................................ 30 0.50
Exhaust Width ......................................... 2.0--3.8 mm (0.079--0.150 in.)
Intake Width............................................. 1.4--3.8 mm (0.055--0.150 in.)
Maximum Seat Runout........................................... 0.051 mm (0.0020 in.)
RG,RG34710,1093
1923OCT972/2
REMOVE VALVE SEAT INSERTS AND
MEASURE BORES IN CYLINDER HEAD
In some cases the valve seat bore in the cylinder head
may become damaged or oversized and will require
machining. In this case, oversize inserts are available in
0.25 mm (0.010 in.) oversize only.
IMPORTANT: Be careful not to damage cylinder head
when removing seats.
1. Remove valve seat insert (if necessary) with JDE41296
Removing Valve Seat Inserts
Valve Seat Puller (A). Adjusting screw on puller may
need to be retightened during removal of inserts.
Valve seat inserts may be also removed using the
following method:
Carefully heat insert at four points around face until
insert becomes red hot. Allow seat to cool and
carefully pry out the insert(s) with a screwdriver.
2. After removal of inserts, thoroughly clean area around
valve seat bore and inspect for damage or cracks.
Heating Valve Seat Inserts
RG,RG34710,1094
1923OCT971/1
