G424 Service Manual Base Engine Service Procedure156
7EN0475
7EN0476
1EN0246
Inspection
1. Piston Ring
(1) Check for the clearance between the piston ring and ring
groove. If the limit is exceeded, replace the ring or both
piston and ring.
(2) Install the piston ring into the cylinder bore. Force it
down with a piston, its crown being in contact with the
ring, to correctly position it at right angles to the cylinder
wall. Then, measure the end gap with a feeler gauge.
If the ring gap is excessive, replace the piston ring.
Standard value:
No.1 0.25 to 0.40 mm (0.0098 to 0.0157 in.)
No.2 0.45 to 0.60 mm (0.0177 to 0.0236 in.)
Oil 0.20 to 0.60 mm (0.0079 to 0.0236 in.)
Limit:
No.1, No.2 0.8 mm(0.031 in.)
Oil 1.0 mm (0.039 in.)
2. Crankshaft Pin Oil Clearance (Plastic Gauge
Method)
(1) Remove oil from the crankshaft pin and the connecting
rod bearing.
(2) Cut the plastic gauge to the same length as the width of
the bearing and place it on the crankshaft pin in parallel
with its axis.
(3) Install the connecting rod cap carefully and tighten the
bolts to the specified torque.
(4) Remove the bolt and carefully remove the connecting
rod cap.
(5) Measure the width of the plastic gauge at its widest part
by using the scale printed on the plastic gauge package.
Standard value: 0.02 to 0.05 mm (0.0008 to 0.0020 in.)
Limit: 0.1 mm (0.004 in.)
Press down ring
with piston
Piston ring
End gap
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