[213 Cc] Camshaft Bushings - Mack E7 Service Manual

5-101.bk Page 5 Friday, March 17, 2006 11:05 AM

[213 CC] Camshaft Bushings

DESCRIPTION
Lubrication oil is pumped into the cylinder block
main oil gallery. Oil from the gallery flows to each
main bearing bushing bore and then on to the
respective camshaft bushing bore, providing
lubrication for both the crankshaft and camshaft
bushings. Camshaft bushing bores No. 1, 2 and 5
are grooved to supply oil to other components as
well. Oil from the No. 1 camshaft bushing bore
flows on through a drilled passage to lubricate the
front auxiliary driveshaft bushing. Oil from the
No. 2 and 5 camshaft bushing bores flows on
through vertical drilled passages to lubricate the
rocker arm assemblies. Oil from the No. 4
camshaft bushing bore flows through a cast
groove in the cylinder block bushing bore to
lubricate the fuel injection pump, the rear auxiliary
driveshaft bushing, and the air compressor.
INSPECTION
During in-chassis overhaul, check the inside
diameter of the camshaft bushings. If overhauling
out-of-chassis, replace camshaft bushings.
1. Using a telescope gauge or suitable inside
micrometer, measure the ID of each
camshaft bushing in the cylinder block.
Record the dimensions. Refer to Figure 6-4.
Figure 6-4 — Measuring Camshaft Bushing ID
200 ENGINE ASSEMBLY
2. Refer to the Fits and Limits chart for
3. If bore size exceeds tolerance or if there is
REMOVAL
Refer to Figure 6-5.
Use camshaft bushing remover/installer kit
J 37713 (use with J 21428-01 kit) for camshaft
bushing removal.
Camshaft bushings are identified in sequence
from 1 to 7, starting from the front of the engine.
1. Using camshaft bushing remover/installer kit
2. Remove the remaining six bushings in
camshaft bushing measurement
specifications. Check the recorded
dimensions against the specifications.
any evidence of scratching or scoring,
replace the bushings.
J 21428-01 (2), with the correct pilot adapter
(J 37713 kit) and a hammer (3), remove the
No. 1 camshaft bushing (4) from the cylinder
block (1).
sequence.
1
2
4
Figure 6-5 — Camshaft Bushing Removal
1. Cylinder block 3. Hammer
2. Camshaft bushing 4. No. 1 camshaft bushing
remover/installer
(J 21428-01 kit)
3
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