TM 10-4930-351-14
0109 00
CHECK PISTON PROTRUSION (Refer to Figure 14.)
This procedure applies to both/either cylinder.
INITIAL SET-UP:
Tools:
Materials/Parts Required
Feeler Gauge with 0.004 and 0.008 inch leafs
Gasket, Cylinder (WP 0117 00, Item 51)
(WP 0113 00, Item 3)
Machinists Rule
Equipment Condition:
(WP 0113 00, Item 3)
Piston assembly installed in cylinder
1.
Slowly rotate flywheel to the right until piston (1) is at TDC (highest point).
2
3
1
Figure 14. Piston Protrusion Check
2.
Using a feeler gauge and a machinist's rule (or other straight edge) as illustrated, verify piston (1) is above top of
cylinder (2) by 0.004 to 0.008 in. (0.1-0.2 mm). If measurement is within this range, piston (1) protrusion is satisfactory.
If reading is less than 0.004 in. (0.1 mm) above top of cylinder (2), gaskets (3) must be added between cylinder and
crankcase. If reading is more than 0.008 in. (0.2 mm) above top of cylinder (2), gaskets (3) must be removed between
cylinder and crankcase.
NOTE
When adding or removing cylinder gaskets, measure thickness of gasket(s) to ensure
proper range will be attained.
3.
Remove cylinder (2) from piston (1). Add or remove gaskets (3) as required to obtain piston (1) protrusion of 0.004 to
0.008 in. (0.1-0.2 mm).
4.
Slide cylinder (2) over piston (1) and press into crankcase.
0109 00-18
