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68 Workshop Manual, TPD 1458E, issue 3 - Perkins Confidential: Green
400 Series
Cylinder bore
To inspect Operation 7-4
1 Visually inspect cylinder bore. There should be no scoring or corrosion.
2 Measure the cylinder bore using a cylinder gauge at the upper, middle and lower areas (piston ring contact
area) in the direction of the crankshaft (1) and at the right angle to the crankshaft (2).
3 The upper area in the cylinder block is where the top ring is in contact with the cylinder bore when the piston
is at T.D.C. (approximately 10 mm below the cylinder block top face). The lower area is where the oil control
ring is in contact with the cylinder bore when the piston is at B. D. C. (about 100 mm from the top face).
Caution: The 400 Series range of engines must not be flexi honed.
If the bore diameter is larger than the service limit for the engine model listed below, renew the cylinder block
with a long engine.
Caution: The fuel adjustment screw must be set by an approved Perkins dealer to ensure that the engine will
comply with emissions legislation.
If the cylinder block is renewed, the engine should be tested on an engine test brake and the fuel adjustment
screw set.
If a suitable engine test brake is not available, a long engine is available as a service part.
Engine Bore diameter new cylinder block Service limit
403C-11 77,000 - 77,019 mm (3.03100 - 3.03200 in) 77,200 mm (3.03900 in)
403C-15
404C-22
404C-22T
84,000 - 84,019 mm (3.30710 - 3.30783 in) 84,200 mm (3.31500 in)
H1085
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