1
CYLINDER HEAD
CRACK
CYLINDER HEAD
GASKET
PISTON
RING
SEALING
VALVE
SEALING
2
TM 9-4940-568-34
5-45
This task covers:
a. Piston Ring Sealing
b. Valve Sealing
c. Head Gasket Sealing
d. Follow-On Maintenance
INITIAL SETUP
Equipment Condition
FRS unloaded, (TM 9-4940-568-10)
Remove front panel, (TM 9-4940-568-10)
Tools and Special Tools
Tool Kit, General Mechanic’s
(Item 67, Appendix F)
Tester, Cylinder Compression
(Item 63, Appendix F)
5-8. ENGINE COMPRESSION CHECK.
Materials/Parts
Oil, Lubricating (Item 17, Appendix B)
Soap Solution (Item 33, Appendix B)
NOTE
If the air and fuel system are
functioning correctly, perform a
compression check to determine
whether the problem is piston
ring sealing, valve sealing and/or
cylinder head gasket sealing or a
crack in the cylinder head.
a.
Piston Ring Sealing.
If the compression is low but can be increased
significantly by squirting lubricating oil into the
cylinder (1), the cause of low compression is
inadequate sealing between the piston rings (2)
and the cylinder walls, notify GS Maintenance.
