Perkins New 1000 Series, Руководство по ремонту, Страница: 71 / 290

Workshop Manual, TPD 1350, issue 3 71
13
New 1000 Series
Piston rings
To remove and to fit 13-5
The pistons have two compression rings and an oil
control ring. All the piston rings are above the
gudgeon pin. To ensure that the correct type is
obtained always use the engine identification number
to order new parts.
Caution: Only expand the ring gaps enough to
ensure that the ends of the rings do not damage the
piston when the ring is removed or put into position.
To remove
Remove the piston rings with a suitable ring
expander. Keep the rings with their relevant piston.
To fit
Use a suitable piston ring expander to fit the piston
rings.
1 Fit the spring of the oil control ring in the bottom
groove with the latch pin (A1) inside both ends of the
spring (A). Fit the oil control ring over the spring (B3)
or (C3). Ensure that the ring gap is at 180° to the latch
pin.
2 Fit the cast iron ring with the taper face into the
second groove, with the word "TOP" towards the top
of the piston.
New second rings have a green identification mark
which must be on the left of the ring gap when the ring
is fitted and the piston is upright.
The second ring has a step (B2) or (C2) at the bottom
of the tapered face.
3 Fit the tapered, top ring (B1) or (C1) with the word
'TOP' towards the top of the piston.
Note: The top ring (C1) of engine types AR and AS is
parallel.
New top rings have a red identification mark which
must be on the left of the ring gap when the ring is
fitted and the piston is upright.
4 Ensure that the ring gaps are 120° apart.
1
2
3
C
A
A0353
1
A1447
1
2
3
B
A1447/1
Purchased from www.WorkshopManuals.co.uk