Operation 4-8 To Fit - Perkins New 1000 Series Workshop Manual

4
To fit
Use a suitable piston ring expander to fit the piston rings.
Caution: Only expand the ring gaps enough to ensure that the ends of the rings do not damage the piston
when the ring is put into position.
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.
Note: A small taper has been added to the oil control rings for engine types AR and AS. This is to reduce the
oil consumption during the early life of the engine. When new oil control rings are fitted, the blue mark must be
fitted to the left of the piston ring gap. The word 'TOP' will then be toward the top of the piston.
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
A
C
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This document has been printed from SPI². Not for Resale
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Workshop Manual, TPD 1350E, Issue 4
New 1000 Series
Operation 4-8
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