GMC Powertrain 4.3 L, Service Manual, Page: 81 / 196

Engine Marine/Industrial 4.3L 6-71
2000 Marine/Industrial
4969
22934
4976
7. Measure the piston ring-to-piston ring groove side
clearance.
7.1. Insert the edge of the piston ring into the piston ring
groove.
7.2. Roll the piston ring completely around the piston.
• If binding is caused by a distorted piston ring
groove, MINOR imperfections may be removed
with a fine file.
• If binding is caused by a distorted piston ring,
replace the piston ring.
8. Measure the piston ring side clearance with a feeler gauge.
9. If the side clearance is too small, try another piston ring set.
10. If the proper piston ring-to-piston ring groove clearance
cannot be achieved, replace the piston and pin assembly.
11. To determine the proper piston ring side clearance, refer to
Engine Mechanical Specifications.
12. To determine piston pin-to-bore clearance, use a
micrometer and measure the piston pin.