ENGINE MECHANICAL SERVICE MANUAL NUMBER 22
Page 3A-114 90-860074--1 FEBRUARY 2002
8. Using Piston Ring Expander 91-24697, install the second compression ring in the center
piston groove. Scraper side of ring must face bottom of piston
.
70299
a
a-Scraper Side Toward Bottom Of Piston
IMPORTANT: On all engines the word - TOP - appears on the upper surface of the first
compression ring, and MUST FACE UP.
9. Using piston ring expander, install first compression ring in upper piston groove.
Installation
1. Before installing pistons into cylinders, ring gaps must be positioned as follows:
a. First compression ring (trapezoidal) gap, 30 degrees to the right of combustion
chamber recess.
b. Second compression ring gap, directly opposite the combustion chamber recess.
c. Lower (oil control) ring gap, 30 degrees to the left of combustion chamber recess.
a
b
c
78416
Typical
a-First Ring Gap
b-Second Ring Gap
c-Lower (Oil Control) Ring Gap
2. Lubricate cylinder bore and piston rings with SAE 30W engine oil.
3. Each piston and connecting rod assembly must be installed in the cylinder from which
it was removed.
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