DESCRIPTION AND OPERATION
Page 27
CRANKSHAFT
The crankshaft is drop forged steel. Bearing
surfaces are induction hardened. It has seven
journals with replaceable bearings. Five
oversized replacement bearing options are
available to accommodate crankshaft regrinding.
The rear main cap (No. 7) includes an attaching
point for the lube pump. Thrust washers to control
axial movement straddle the central journal (cap
No. 4). The remaining caps (Nos. 1–3, 5 and 6)
are numbered to facilitate correct assembly.
Whenever the lower main bearing caps are
installed in the engine block, pay special attention
to ensure the lower main bearing cap is installed
in the same location of the block as removed and
that the alignment boss on the bearing cap aligns
with the boss on the engine block.
15
Figure 15 — Crankshaft
A Teflon
®
seal bearing directly on the crankshaft
flange is used at the front of the crankshaft. The
front seal has an outer felt ring which serves as a
dust cover. At the rear of the crankshaft is another
seal that bears directly on the machined surface
of the crankshaft gear. Additionally at the rear,
there is a groove in the rear crankshaft flange for
an O-ring which forms a seal between the flange
and the gear.
1. Cylinder Block
2. Upper Crankshaft Bearing
3. Crankshaft
4. Lower Crankshaft Bearing
5. Crankshaft Bearing Cap
6. Lower Crankshaft Thrust Washer
7. Cap Aligning Nipple — on Cap
8. Cap Aligning Nipple — on Block
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