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.
P0007834
10
9
2
6
3
4
5
7
1
8
P0007835
6
2
4
5
1
3
20-0 Engine Information, General
36
47701798 05-2013 © AB VOLVO PENTA
Summary of Contents for D1-13
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Page 133: ...References to Service Bulletins Group No Date Refers to 131 ...
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