Perkins New 1000 Series, Руководство по ремонту, Страница: 79 / 290

Workshop Manual, TPD 1350, issue 3
79
14
New 1000 Series
Crankshaft assembly
14
General description
The crankshaft is a chrome-molybdenum forging
which has five main journals for four cylinder engines
and seven main journals for six cylinder engines.
End-float is controlled by thrust washers on both sides
of the centre main bearing.
The main bearings have steel backs with a
aluminium/tin bearing material except the centre main
bearing of six cylinder engines, which has a bearing
material of lead bronze with a lead finish. The main
bearing caps are made of cast iron or spheroidal
graphite (SG) iron.
The front and the rear oil seals are Viton lip seals with
a dust lip to the outside of the main lip and with oil
return grooves on the face of the main lip.
Warning! Read the safety precautions for "Viton"
seals on
page 18.
The crankshaft pulley (A3) of the four cylinder engine,
usually fitted without a damper, is held in position by
a plain thrust block (A1) and three setscrews (A2).
The nose of the crankshaft is serrated for location.
The location of the front pulley of six cylinder engines
is by a key in the crankshaft nose and the pulley is
held in position by a tapered rings arrangement (B).
An integral damper, with a rubber insert (B6) is built
into the pulley of six cylinder engines and some four
cylinder engines. Six cylinder engines have a viscous
damper (C2) which is fastened to the front or rear face
of the pulley (C1). All of the dampers are designed for
the suppression of torsional vibrations in the engine
crankshaft.
A balancer unit is fitted to certain four cylinder engines
which have rigid mountings or which are part of the
chassis or frame. The purpose of the balancer unit is
to reduce the effect of the out-of-balance forces.
1 2
3
A
A0357
B
A0093
2 1 4 3
6
5
1
2
C
A0165
Purchased from www.WorkshopManuals.co.uk