VALVE SPRINGS - TM-10-3930-607-150043

ENGINE

Figure 16.

Figure 18.

3. Check all refaced or new valves in V-blocks with

indicator to determine if the contact face is true with the

stem within .002". (Fig. 17) If not, repeat the refacing

operation.

Figure 19.

5. After the narrowed-down seat is brought within

specifications, the seat should be retouched lightly with

the original stone to remove burrs or feathered edge.

Coat the valve stem with a light film of engine oil.

Figure 17.

E. VALVE SPRINGS

4. After the valves and seats have been refaced

and reground, coat the seat lightly with "Prussian Blue"

Check all valve springs on the spring tester to make

and drop the valve into position, oscillating it slightly to

sure they meet specifications regarding force and

transfer the blue pattern to the valve face. This should

length. (Fig. 20) Springs, when compressed to the

show a contact width of 1/16" to 3/32" and should fall

"valve open" or "valve closed" length, must fall within

well within the width of the valve face, leaving at least

correct specifications when new, and must not show

1/64" on either side where the blue does not show. If

more than 10% loss in order to re-use. Reassemble the

the valve contact is over 3/32" wide, the seat in the

valves and springs in the block with the retainer and

block may be narrowed by using a 15 stone to reduce

retainer pin.

the outside diameter or using a 60 or 75 stone to

increase the inside diameter. (Fig. 18) Never allow

valves to sit down inside the seat. (Fig. 19)

B-6