3-20. CAMSHAFT, CAMSHAFT GEAR, AND CAMSHAFT BUSHING REPLACEMENT
Inspect camshaft bushing and
camshaft bores in cylinder block.
Inspect camshaft bushing (6) and
camshaft (3) bores for burrs, scoring,
grooves, and pitting.
Measure front camshaft bushing (6)
I.D. Acceptable range is 2.1295 -
2.1314 in (54.09 - 54.14 mm).
If intermediate and rear camshaft
bores have service bushings
installed, the I.D. dimension must
be within the tolerance specified
above in Step (b).
Measure intermediate and rear
camshaft bores I.D. Acceptable bore
I.D. range is 2.1295 - 2.1314 in.
(54.09 - 54.14 mm). If bores are
worn beyond this specification, the
cylinder block must be machined
and service bushings installed, or
the cylinder block must be replaced.
Refer to Depot level maintenance.
If new valve tappets are being
installed, the camshaft and
camshaft bushing must be replaced.
Inspect camshaft (3).
Inspect fuel lift pump lobe, valve
lobes and camshaft bearing journal
for cracking, pitting, or other
Measure bearing journal diameter.
Minimum allowable diameter is
2.1245 in. (53.962 mm).