Perkins UA Workshop Manual page 82

4
To check length and to inspect
Cautions:
l The big-end bolts are fitted to the connecting rod by a special process and must not be removed. As the
connecting rod, and the bolts will be damaged.
l It is important that the piston does not contact the cylinder head.
l Ensure that the piston height above the cylinder block is correct.
l Ensure that the connecting rods are fitted in the correct cylinder.
l Record the position of the connecting rod and its relevant cylinder when it is removed from the engine.
A concentric small end bush, that can be fitted to the original connecting rod and machined to obtain the correct
length grade is available. Specialist equipment and personnel with the correct training are needed to machine
the partially finished small end bush.
Connecting rod kits are also available with the small end bush fitted and machined to give the correct
connecting rod grade.
To ensure that the piston height above the cylinder block is correct, the engine may have up to three length
grades (B, D and F) of connecting rods fitted.
Identification of the length grade is by a letter, that is marked on the left side of each connecting rod.
The cylinder number is marked on the left side of the connecting rod and cap. The letter B is the longest grade
of connecting rod and letter F is the shortest grade. The difference between each grade is 0,06mm (0.002 in).
The letter that is marked on the right side of the connecting rod is the manufacturer's reference number.
The dimensions for the service grades are listed in the table below.
Production grade
letters
A and B
C and D
E and F
70
This document has been printed from SPI². Not for Resale
Service grade
letters
B
D
F
Workshop Manual, TPD 1392E, issue 3
700 Series
Operation 4-11
Length
(mm)
132,05/132,0
131,99/132,02
131,93/131,96
Continued