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1 - SIDE RAIL UPPER
2 - NO. 1 RING GAP
3 - PISTON PIN
4 - SIDE RAIL LOWER
5 - NO. 2 RING GAP AND SPACER EXPANDER GAP
5. Position piston ring end gaps.
6. Position oil ring expander gap (5) at least 45° from the side rail gaps (1,4) but not on the piston pin (3)
center or on the thrust direction. Staggering ring gap is important for oil control.
ROD, PISTON AND CONNECTING
Description
DESCRIPTION
CAUTION: DO NOT STAMP the connecting rods during identification. The use of a
scribe or a paint mark is acceptable.
NOTE:
The connecting rods in this engine are a cracked cap design. The cracked cap
design is easily identified by the connecting rod cap bolts rather than the
traditional forged connecting rod cap nuts. The connecting rod caps must be
paint marked or scribed to identify the accompanying connecting rod.
Connecting rod caps ARE NOT interchangeable between connecting rods.
The pistons are made of cast aluminum alloy and are a strutless, short skirt design. The piston rings consist of
two compression rings and a three piece oil ring. Piston pins connect the piston to the forged steel connecting
rods. The piston pins are a press fit into the connecting rod small bore. The piston, pin and connecting rod are
serviced as an assembly.
Standard Procedure
FITTING CONNECTING RODS
Fig. 158: Checking Cylinder Head Bolts
Courtesy of CHRYSLER LLC
viernes, 1 de octubre de 2021 05:18:31 p. m.
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
Page 127
© 2011 Mitchell Repair Information Company, LLC.
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