Timing Sprocket Alignment Marks; Installing Timing Chain; Camshaft Bearing Removal - Pontiac TRANS AM 1977 Service Manual

305-350 ENGINE 6A6-15
Fig. 6A6-32 Timing Sprocket Alignment Marks
Fig. 6A6-33 Installing Timing Chain
CAMSHAFT BEARINGS
Removal
Camshaft bearings can be replaced while engine is
disassembled for overhaul, or without complete disassembly
of the engine. T o replace bearings without complete
disassembly remove the camshaft and crankshaft leaving
cylinder heads attached and pistons in place. Before removing
crankshaft, tape threads of connecting rod bolts to prevent
damage to crankshaft. Fasten connecting rods against sides
of engine so they will not be in the way while replacing
camshaft bearings.
1. With camshaft and crankshaft removed, drive
camshaft rear plug from cylinder block.
NOTE: This procedure is based on removal of the
bearings nearest center of the engine first. With this
method a minimum amount of turns are necessary to
remove all bearings.
2.
Using Tool Set
J 6098, with nut and thrust washer
installed to end of threads, index pilot in camshaft front
bearing and install puller screw through pilot.
3. Install remover and install tool with shoulder toward
bearing, making sure a sufficient amount of threads are
engaged.
4. Using two wrenches, hold puller screw while turning
nut. When bearing has been pulled from bore, remove
remover and installer tool and bearing from puller screw (Fig.
6A6-34).
Fig. 6A6-34 Camshaft Bearing Removal
5. Remove remaining bearings (except front and rear)
in the same manner. It will be necessary to index pilot in
camshaft rear bearing to remove the rear intermediate
bearing.
6. Assemble remover and installer tool on driver handle
and remove camshaft front and rear bearings by driving
toward center of cylinder block (Fig. 6A6-35).
Installation
The camshaft front and rear bearings should be installed
first. These bearings will act as guides for the pilot and center
the remaining bearings being pulled into place.
1. Assemble remover and installer tool on driver handle
and install camshaft front and rear bearings by driving
toward center of cylinder block.