Rocker Arm Studs - Chevrolet 1980 Light Duty Truck Service Manual

GRIND OUT THIS PORTION
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Fig. 6A4-24--Cutaway Scale
5. Check the installed height of the valve springs, using
a narrow thin scale. A cutaway scale will help (fig. 6A4-24).
Measure from the top of the shim or the spring seat to the
top of the oil shedder (fig. 6A4-25). If this is found to exceed
the specified height, install a valve spring seat shim
approximately 1/16" (1.6mm) thick. At no time should the
spring be shimmed to give an installed height under the
minimum specified.
Installation
• The gasket surfaces on both the head and the block
must be clean of any foreign matter and free of nicks or
heavy scratches. Cylinder bolt threads in the block and
threads on the cylinder head bolts must be clean as dirt will
affect bolt torque.
1. If using a STEEL gasket, coat both sides of a new
gasket with a good sealer. Spread the sealer thin and even.
One method of applying the sealer that will assure the
proper coat is with the use of a paint roller. Too much sealer
may hold the gasket away from the head or block.
• Use no sealer if using a composition STEEL
ASBESTOS gasket.
2. Place the gasket in position over the dowel pins with
the bead up.
3. Carefully guide the cylinder head into place over the
dowel pins and gasket.
4. Coat threads of cylinder head bolts with sealing
compound, # 1052080 or equivalent, and install bolts finger
tight.
5. Tighten each cylinder head bolt a little at a time in
the sequence shown in the torque sequence chart until the
specified torque is reached.
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Fig. 6A4-26--Removing Rocker Arm Stud
6. Install exhaust manifolds as previously outlined.
7. Install intake manifold as previously outlined.
8. Install and adjust valve mechanism as previously
outlined.
ROCKER A R M STUDS
Replacement
Rocker arm studs that have damaged threads or are
loose in cylinder heads should be replaced with new studs
available in .003" and .013" oversize. Studs may be installed
after reaming the holes as follows:
1. Remove old stud by placing Tool J-5802-1 over the
stud, installing nut and flat washer and removing stud by
turning nut (fig. 6A4-26).
2. Ream hole for oversize stud using Tool J-5715 for
.003" oversize or Tool J-6036 for .013" oversize (fig. 6A4-
27).
Fig. 6 A 4 -2 7 --R ea m in g Rocker Arm Stud Bore
SM ALL BLOCK 6A 4-17
LIG H T T R U C K S ER V ICE M AN UAL