Specifications

(30) Remove the engine cylinder heads and gasket.
NOTE: A single steel head gasket is used for 4 cyl-
inder heads (Fig. 33).
(31) Stuff clean lint free shop towels into the cyl-
inder bores.
CYLINDER HEAD GASKET
NOTE: If cylinder wall liners have not been
removed; the same thickness head gasket removed,
may be used.
CAUTION: Piston protrusion must be measured, to
determine cylinder head gasket thickness, if one or
more cylinder wall liners have been replaced.
Cylinder head gaskets are available in three thick-
ness. The different thicknesses are marked with
identification holes (one, two or none) (Fig. 33). The
gasket is to be installed DRY. DO NOT use a gas-
ket sealing compound on the gasket.
(1) Use special tool VM-1010 with dial indicator
special tool VM- 1013 (Fig. 31).
(2) Bring the piston of cylinder no. 1 exactly to top
dead center.
(3) Zero the dial indicator on the cylinder block
mating surface.
(4) Setup the dial indicator on the piston crown
(above the center of the piston pin) 5mm (1/8 in.)
from the edge of the piston and note the measure-
ment (Fig. 32).
(5) Repeat the procedure with the rest of the cyl-
inders.
(6) Establish the thickness of the gasket for all
four cylinder heads on the basis of the greatest pis-
ton protrusion (Fig. 33).
INSTALLATION CYLINDER HEAD
(1) Remove the shop towels from the cylinder
bores. Coat the bores with clean engine oil.
(2) Install cylinder head alignment studs
(VM-1009).
(3) After determining the correct head gasket
thickness, clean the block and head mating surfaces,
place the engine cylinder head gasket over the dow-
els.
(4) Place the engine cylinder head over the dowels.
CAUTION: Engine cylinder head bolts can be
reused up to three times.
Fig. 31 Measuring Piston Protrusion
Fig. 32 Piston Protrusion Chart
Fig. 33 Head Gasket Identification
NS/GS ENGINE 9 - 51
REMOVAL AND INSTALLATION (Continued)