TM 5-3895-360-13
6-5. ENGINE
TOOLS:
COMPRESSION TEST
General mechanic’s tool kit . . . . . . . SC 5180-90-N26
Cylinder compression tester . . . . . . SC 4910-95-A31
NOTE
The VR11C and VR11 engine compression
tests are performed the same way. VR11C Is Il-
Iustrated.
COMPRESSION TEST
a. Remove spark plug (see paragraph 9-3).
NOTE
Refer to Figure 6-19, Engine Compression
Test, for steps b through d.
b. Insert tip of compression tester into cylinder (1).
c. Set throttle to wide open position.
d.
e.
Crank engine (see paragraph 2-4) several times to
ensure that cylinder comes up for the compression
portion of its stroke. Note reading on compression
tester. Reading must be 90-110 psi (621-756 kPa). If
compression pressure is not within specification, in-
spect cylinder (see paragraph 6-3) and replace as
required.
Install spark plug (see paragraph 9-3).
Figure 6-19. Engine Compression Test.
6-16
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