Service manual

181 CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 3A-59
5. Pull camshaft and gear assembly out through front of block.
IMPORTANT: Support camshaft carefully when removing to protect camshaft bear-
ings.
74438
a
b
a-Timing Marks
b-Screw Access Holes
Inspection
1. Measure camshaft bearing journals with a micrometer for out-of-round condition. If
journals exceed .001 in. (0.02 mm) out-of-round, camshaft should be replaced.
2. Also check camshaft for alignment with V-blocks and dial indicator which indicates exact
amount camshaft is out of true. If dial indicator reads more than .002 in. (0.05 mm)
camshaft should be replaced.
72909
Checking Camshaft Alignment
3. Inspect camshaft gear and thrust plate for wear or damage. Measure camshaft end play
.001 - .005 in. (0.03-0.1 mm).
74439
d
a
b
c
a-Feeler Gauge
b-Camshaft Gear
c-Camshaft Thrust Plate
d-Take Measurement Here
Index