Piston And Connecting Rod Assembly; General Description - Perkins 900 Series Workshop Manual

900 Series
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Piston and connecting rod assembly

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General description

The pistons used in the 900 Series engines have a special combustion chamber (A1) in the top of the piston
to give an efficient mix of fuel and air. The pistons are available with two height grades to ensure close control
of compression ratio and emission control.
The naturally aspirated (CP) and turbocharged (CR) engines both have two compression rings and an oil
control ring. All the piston rings are above the gudgeon pin. The (CR) engine has a hard metal insert to reduce
wear of the groove and a wedge shaped top ring. Axial location of the fully floating gudgeon pin is by circlips.
Note: Always use the full engine number to order new parts.
The connecting rods (B) are machined from "H" section forgings of molybdenum steel. The big end cap is
retained by two special bolts and nuts. The naturally aspirated (CP) engine big end has aluminium-tin shell
bearings and the turbocharged (CR) engine has lead-bronze shell bearings. Both engines have lead-bronze
small end bushes.
1
A B
C0041 C0112
Workshop Manual, TPD 1345E, issue 3 63
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