Saab 95 1967, Service Manual

Page: 158 / 610

CRANKSHAFT BEARINGS
Disassembly
1. Install the engine on a work stand.
2. To prevent oil sludge and impurities from entering the
engine, the oil pan must be removed downwards with
the engine in the normal position.
3. Remove the oil pump with its drive shaft.
4. Remove the crankshaft bearing cap nuts and take off
the bearing caps and bearing inserts.
5. Press the connecting rod away from the crankshaft
and remove the bearing insert.
Reassembly
1. Fit new connecting rod bolts.
NOTE
Fit new connecting rod bolts every time the crank-
shaft has been disassembled.
2.
To ensure that the fitting clearance is correct, the
clearance should be measured.
3. Install the bearing inserts dry in the connecting rods
and then coat them with engine oil.
4. Pull the connecting rod against the crank pin and put
on the bearing cap. Make sure that the marks on con-
necting rod and bearing cap coincide. Tighten the nuts
to the prescribed torque.
mp onto its drive shaft and install it
Tighten the two bolts for the actual
n the suction line bolt.
al in the groove in the rear main
5. Slide the oil pu
with the gasket.
pump first and the
6. Insert the rubber se
bearing cap. . .
7 If a new crankshaft or new bearlng Inserts have been
installed check that the correct fitting clearance is
obtained.
MEASURING THE CLEARANCE, CRANKSHAFT AND
CONNECTING ROD BEARINGS
The clearance is measured with Plastigage. Plastigage is
available under Spare part number 78 60 505.
Plastigage is supplied in three different thicknesses. Type
PG-I (green) must be used, since this type allows measu-
rement of clearances from 0.00098 to 0.00299 in. (0.025_
0.076 mm).
Instructions for the use of Plastigage
1. Position the engine with the cylinder head facing
downwards to prevent the weight of the crankshaft
from influencing the measurement of main bearing
clearance.
The weight of the crankshaft does not influence the
measurement of the connecting rod bearing clearance.
2. Make sure that the parts to be measured are free of
oil and dirt. Install a dry bearing insert in the bearing
cap and position a strip of Plastigage in the insert
about 0.236 in. (6 mm) off center.
3*
'
3’
MARKING OF PISTONS AND CONNECTING RODS
$1233
MEASURING PLACE FOR PLASTIGAGE
mm In “A—