(a) Measure the clearance between the piston ring and the piston ring
groove with a feeler gauge.
Oil scraper ring
0.400-0.600 mm
Second compression
ring
(3) Turn the bolt 120°±5°.
(2) If the actual clearance is out of tolerance, the piston ring must
be replaced. If necessary, also replace the piston rod.
Rated value (mm):
Piston ring First
compression
(1) Tool: internal micrometer
(2) If the actual diameter is out of range, the piston connecting rod
must be replaced with a part of the same quality and group.
0.035-0.080 mm
0.250-0.400 mm
(a) Tighten the connecting rod cap bolts.
(2) Put a paint mark on the bolt head.
ring
Second compression
Oil scraper ring
(b) Measure the bore diameter of the bottom end of the connecting rod (R)
10. Check piston rings and grooves
ring
(b) Check the piston ring gap (1) Install the piston ring to
a depth of 110 mm from the top edge of the cylinder block, and
measure the piston ring gap with a feeler gauge.
Piston ring First
compression
0.200-0.400 mm
ÿ Nominal value: 50.600-50.615mm
0.040-0.080 mm
Rated value (mm):
11. Checking the bottom end of the connecting rod
0.020-0.060 mm
ring
(1) Tighten the bolts to 20±1.6 N•m.
90
4C20 Gasoline Engine Repair Manual
Machine Translated by Google
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