MULTI
CYLINDER
ENGINES
OIL
PICKUP
(2GM,
2GM20,
3GM
AND
3GM30
MODELS)
When installing the valve guides, the grooved end must
be toward the top
of
the cylinder head. The groove must
be flush with the head surface as shown in
Figure
25.
PUSH
RODS
1. Remove the rocker arms as previously described.
2. Remove the push rods and mark them so they can be
reinstalled in their original positions.
3. Inspect the push rod ends for damage. Maximum al-
lowable runout is 0.03 mm (0.0012 in.).
113
4. Reinstall the push rods by reversing the removal pro-
cedure. Adjust valve clearance as described in Chapter
Three.
PISTON/CONNECTING
ROD
ASSEMBLY
Piston/Connecting
Rod
Removal
1. Remove the engine as described in this chapter.
2. Place a suitable containerunder the oil pan and remove
the drain plug. Let the crankcase oil drain, then reinstall
the drain plug.
3. Remove the cylinderhead as described in this chapter.
4. Remove the oil pan.
5. On 2GM, 2GM20,
3GM
and 3GM30
models-Loosen
the oil pickup
jam
nut
(Figure
26) and remove the oil
pickup.
6. Rotate the crankshaft until the piston is at bottom dead
center. Pack the cylinder bore with clean shop rags. Re-
move the carbon ridge at the top
ofthe
cylinder bore with
a ridge reamer. These can be rented for use. Vacuum out
the shavings, then remove the shop rags.
7. Rotate the crankshaft until the connecting rod is cen-
tered in the bore. Measure the clearance between the con-
necting rod and the crankshaft journal flange with a flat
feeler gauge
(Figure
27).
If
the clearance exceeds specifi-
cations (Tables 1-3), replace the connecting rod during re-
assembly.
8. Remove the connecting rod bolts. Lift
off
the cap, to-
gether with the lower bearing insert.
9. Use a wooden hammer handle to push the piston and
connecting rod from the bore.
10. Remove the piston rings with a ring remover
(Figure
28).
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