Basic Engine; Piston Ring Groove - Inspect; Connecting Rod - Inspect - Perkins 1104D NH1 Systems Operation Testing And Adjusting

RENR7967

Basic Engine

Piston Ring Groove - Inspect

Inspect the Piston and the Piston
Rings
1. Check the piston for wear and other damage.
2. Check that the piston rings are free to move in the
grooves and that the rings are not broken.
Inspect the Clearance of the Piston
Ring
1. Remove the piston rings and clean the grooves
and the piston rings.
Illustration 64
(1) Feeler gauge
(2) Piston ring
(3) Piston grooves
2. Fit new piston rings (2) in the piston grooves (3).
3. Check the clearance for the piston ring by placing
a suitable feeler gauge (1) between the piston
groove (3) and the top of piston ring (2). Refer
to Specifications, "Piston and Rings" for the
dimensions.
Note: Some pistons have a tapered top groove and
the piston ring is wedged. The clearance for the top
piston ring cannot be checked by the above method
when this occurs.
Inspect the Piston Ring End Gap
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Illustration 65
(1) Piston ring
(2) Cylinder ring ridge
(3) Feeler gauge
1. Clean all carbon from the top of the cylinder bores.
2. Place each piston ring (1) in the cylinder bore just
below the cylinder ring ridge (2).
3. Use a suitable feeler gauge (3) to measure the
piston ring end gap. Refer to Specifications,
"Piston and Rings" for the dimensions.
Note: The coil spring must be removed from the oil
control ring before the gap of the oil control ring is
measured.

Connecting Rod - Inspect

These procedures determine the following
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characteristics of the connecting rod:
•
The length of the connecting rod
•
The distortion of the connecting rod
•
The parallel alignment of the bores of the
connecting rod
Note: If the crankshaft or the cylinder block are
replaced, the piston height for all cylinders must be
measured. The grade of length of the connecting
rods may need to be changed in order to obtain the
correct piston height.
Testing and Adjusting Section
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