C 20 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN C FI (1983)
C.
Prepare the cored hole (see attached illustration) to accept a brass plug by eliminating cast irregularities. Clean the inside edge of the hole
with a wire brush and wash with solvent to prepare surface for sealant.
Repair of Head Gasket Leakage
D.
Coat the sides of the brass plug and the hole with Loctite 271 or equivalent.
E.
Insert the brass plug slowly and squarely using an arbor press, and the plastic plug driver. Press the plug in until it is flush with the head
surface. If the plug deforms or pulls away from the side of the hole, gently tap the sides of the plug to move them back in contact with the side
of the cast hole while the Loctite is still wet. Allow the Loctite to cure with the head resting with the fire deck down while completing the
following items.
F.
Clean out the cylinder head bolt holes in the block with an M12 x 1.75 tap to remove all old sealer.
G.
Clean the block mating surfaces.
H.
Remove any sheared brass and excessive Loctite that may be on the cylinder head surface.
I.
Check engine injection pump static timing. Timing marks should line up according to Chevrolet Bulletin 82-T-126.
3.
Assembly
A.
All gasket surfaces must be free of dirt and foreign material.
B.
Head gaskets are a special composition gasket that must be used without a sealer.
C.
Install a new head gasket over the dowel pins on the cylinder block.
D.
Use gasket, P/N 14066246. This part number is for a head gasket only.
E.
Carefully reinstall head assembly and replace all head bolts with P/N 14077193. Coat the threads and underside of the bolt head with a teflon
type sealant, such as P/N 1052080 or equivalent, and install bolts finger tight.
NOTICE:
Due to clearances on "C/K" vehicles, the left rear cylinder head bolt must be coated with sealing compound and installed into
the head prior to installation. Care should be used to prevent the bolt from damaging the gasket during installation.
F.
NOTICE: It is mandatory that the following items must be done in the order and sequence shown to insure a uniform bolt tension.
