TM 5-3810-300-24&P-3
1.2.2 EXHAUST VALVES
used, install them in the same relative
location from which they were removed.
3. Hold the valves in place with a strip of masking
tape and turn the cylinder head right side up on
the work bench. Place a board under the head
to support the valves and to provide clearance
between the cam followers and the bench.
4. Install the valve spring seats.
5. Install the valve guide oil seal, if used, on the
valve guide as follows:
a. Place the plastic seal installation cap on
the end of the valve stem. If the cap
extends more than 1/16" below the groove
on the valve stem, remove the cap and cut
off the excess length.
Fig. 17. Grinding Wheel Dressing Tool of Set J 8165
b. Lubricate the installation cap and start the
seal carefully over the valve stem. Push
When a valve seat insert runout within the desired limits
the seal down slowly until the seal rests on
is obtained, determine the position of the contact area
the top of the valve guide.
between the valve and the valve seat insert in the
following manner:
c. Remove the installation cap.
1. Apply a light coat of Prussian blue, or a similar
paste, to the valve seat insert.
2. Lower the stem of the valve in the valve guide
and bounce, but do not rotate, the valve on the
insert. This procedure will indicate the area of
contact on the valve face. The most desirable
area of contact is at the center of the valve face.
After the valve seat inserts have been ground and
checked, thoroughly clean the cylinder head before
installing the valves.
Install Exhaust Valves and Springs
After the valve guides have been checked or replaced,
the valves and valve seat inserts replaced or
reconditioned, and the proper valve spring caps and
seats selected, install the exhaust valves as follows:
1. Clean the valve guides.
2. Lubricate the valve stems and slide the valves all
the way into the guides.
Fig. 18. Determining Concentricity of Valve Seat
Insert with Dial Indicator J 81PAGE 6PAGE 5-2
NOTE:
If reconditioned valves are
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