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Table of Contents
is very important not to turn the crankshaft
while assembled dry. After checking clearance,
remove the crankshaft and clean and lubricate
the journals.
1. Make a note of the bearing size (if any)
stamped on the back of the insert. If the inserts
are color-coded with paint on the edge, note the
2. Check the inside and outside surfaces ofthe
bearing inserts for wear, a bluish tint (burned),
flaking, abrasion or scoring. If the inserts are
good, they may be reused if clearance is
satisfactory. If any insert is questionable,
replace the entire set.
3. Wipe any oil from the crankshaft main
journals and the inserts.
4. Set the upper crankcase upside down on the
workbench. Place it on wood blocks to prevent
damage to the cylinder studs.
5. Install the main bearing inserts in the upper
(Figure 130) and lower (Figure 131) crankcase
halves. Make sure their locking tabs are seated
in the notches (Figure 132).
Ifthe old inserts are reused, be sure the.v
are installed in their original positions to
prevent rapid wear.
6. Install the crankshaft in the upper crankcase
7. Place a strip of Plastigage over each main
bearing journal parallel to the crankshaft.
Do not put Plastigage over the oil holes.
Do not rotate the crankshaft while the
Plastigage strips are in place.
8. Carefully turn the lower crankcase over and
install it on the upper crankcase.
9. Apply oil to the bolt threads and loosely
install the 10 large crankcase bolts (Figure 133).
10. Torque the 10 large bolts in 2 stages, as
specified in Table 2, following the sequence
numbers cast into the bottom of the engine
next to the bolts.
11. Remove the bolts in the same sequence
you tightened them and remove the lower case
12. Measure the width of the flattened
Plastigage according t o manufacturer's
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Table of Contents

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