5.0l / 305 cid / 5.7l / 350 cid ENGINES
SERVICE MANUAL NUMBER 24
Page 3A-80
90-861327--1 OCTOBER 1999
Removal
1. Remove valve lifters.
2. Remove crankcase front cover.
3. Remove fuel pump and fuel pump push rod.
4. Remove camshaft as follows:
a. Remove timing chain and sprocket or timing gears as outlined. On the 5.7L engine
only, remove camshaft thrust plate.
b. Install two 5/16-18 x 5 in. bolts in camshaft bolt holes and carefully remove camshaft
as shown.
72381
Inspection
Measure camshaft bearing journals with a micrometer for out-of-round condition. If journals
exceed .001 in. (0.025 mm) out-of-round, camshaft should be replaced.
Also check camshaft for alignment with V-blocks and dial indicator which indicates exact
amount camshaft is out of true. If out of true more than .002 in. (0.051 mm) (dial indicator
reading) camshaft should be replaced.
On engines with timing gears, inspect camshaft gear and thrust plate for wear and damage.
72382
Checking Camshaft Alignment
Installation
1. Install camshaft as follows:
a. Install two 5/16-18 x 5 in. bolts in camshaft bolt holes.
b. Lubricate camshaft journals with engine oil and install camshaft. Be careful not to
damage bearings.
c. Lubricate camshaft lobes with General Motors Cam and Lifter Prelube or equivalent.
d. Install camshaft thrust plate (retainer) and bolts. Torque the bolts to 106 lb-in. (12
Nm).
e. Install timing chain or gears as outlined.
2. Install fuel pump push rod and fuel pump.
3. Install crankcase front cover and valve lifters as outlined.
Index
