Perkins 900 Series Workshop Manual page 79

900 Series
To check the piston height above the cylinder block
Special requirements
Description
Piston height tool
1 Put the piston height tool on the face of the cylinder block and rotate the dial of the gauge to the zero position.
2 Rotate the crankshaft until the piston is just before top dead centre (TDC).
3 Carefully put the tool (A) over the top of the piston with the plunger of the gauge in contact with the piston
above the axis of the gudgeon pin. Rotate the crankshaft to ensure that the piston is at the highest position
and make a note of the gauge indication. The piston height above the face of the cylinder block should be 0,23/
0,35 mm (0.009/0.014 in).
4 If the piston protrusion exceeds 0,35 mm (0.014 in) and the lowest height grade of piston (Y) has been fitted,
remove the piston, see Operation 4-4, from the cylinder block.
5 Machine the piston crown to remove the material in excess of the 0,23/0,35 mm (0.009/0.014 in) protrusion.
Etch the piston grade and the "Front" arrow data (B) on the piston crown and fit the piston into the cylinder
block, see Operation 4-4.
6 Check the piston height again.
Note: If the original piston is used, ensure that it is assembled to the correct connecting rod and is used in the
original cylinder.
A
Workshop Manual, TPD 1345E, issue 3
This document has been printed from SPI². Not for Resale
Special tools
Part number
21825496 Dial gauge
B
C0045
Operation 4-6
Description
Y
4
Part number
21825617
C0052
69