TM 5-3805-258-24-1
A I R I N L E T A N D E X H A U S T S Y S T E M
2. Make an adjustment to the valve clearance on
the intake valves for cylinders 1 and 2. Make
an adjustment to the valve clearance on the
exhaust valves for cylinders 1 and 3.
3.
4.
C Y L I N D E R
A N D
V A L V E
I D E N T I F I C A T I ON
Turn the flywheel 360° in the direction of
engine rot at ion. This will put No.4 piston at
top center (TC) on the compression stroke.
Make an adjustment to the valve clearance on
the intake valve for cylinder 3 and 4. Make an
adjustment to the valve clearance on the
exhaust valves for cylinders 2 and 4.
5. After valve adjustment is correct, tighten the
nuts for the valve adjustment screws to 28 ± 4
N·m (22 ± 3 lb. ft.).
T E S T I N G
A N D
A D J U S T I N G
PROCEDURE FOR MEASURING
CAMSHAFT LOBES
To find lobe lift, use the procedure that follows:
A. Measure camshaft lobe height (B) of one
exhaust and one intake lobe.
B. Measure base circle (C) of one exhaust and
one intake lobe.
C.
D.
Subtract base circle (STEP B) from lobe
height (STEP A). The difference is actual
lobe lift (A).
Specified camshaft lobe lift (A) is 8.382 mm
(.3300 in.).
Maximum permissible difference between actual
lobe lift (STEP C) and specified lobe lift (STEP D) is
0.25 mm (.010 in.).
C A M S H A F T
L O BE
A. Lobe lift. B. Lobe height. C. Bese circle.
V A L V E
A D J U S T M E NT
( T Y P I C A L
E X A M P L E)
4-28
