Crankshaft; Transmission; Main And Big-End Bearings; Con Rods - Volvo Penta D1-13 Workshop Manual

20-0 Engine Information, General
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Crankshaft

The crankshaft (1) is supported by main bearings (2).
The thrust bearing is integrated in the rear main bear-
ing cap (3). The crankshaft is statically and dynamically
balanced, and has induction hardened bearing surfa-
ces. At the front end, where the gear wheel (4) for the
timing gear and the pulley (5) for the alternator and
coolant pump are located, the crankshaft has a groove
for a Woodruff key. At the rear of the crankshaft, there
is a flange (6) to which the flywheel is attached.

Main and big-end bearings

The main and big-end bearings (7) comprise steel
shells lined with bearing metal. The bearings are pre-
cision made and are ready to be installed.

Con rods

The connecting rods (8) are of I-section. The small end
is drilled for piston pin lubrication.
Pistons
The pistons (9) are made of light metal alloy. They
have three piston rings (10). Two piston rings are com-
pression rings and one is an oil ring.

Transmission

The timing gear comprises cylindrical gear wheels with
helical cogs and is located at the front of the cylinder
block. A timing gear cover (1) provides complete pro-
tection for the timing gear.
The camshaft (2) and raw water pump (3) are driven
by the crankshaft gear (4), via an idler wheel (5). The
engine lubrication pump is integral with the idler gear,
and is driven by it. The governor weights (6) are sus-
pended at the front of the camshaft drive and adjust
the injection pump via a mechanism in the timing gear
cover.
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