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FE290 ENGINE
Piston and Connecting Rod
2000 FE290 Gasoline Vehicle Maintenance and Service Supplement Page 13-27
13
3. If the end-gap of any ring is greater than 0.0472 inch (1.199 mm), replace the entire set of rings.
4. Using a micrometer, measure the thickness of both piston rings at several points around the rings
(Figure 13-54, Page 13-28).
5. If either ring thickness is less than 0.0566 inch (1.438 mm), replace the entire set of rings.
Piston Pin Inspection
1. Using a micrometer, measure the outside diameter of the piston pin at several points along its length
(Figure 13-55, Page 13-28).
2. If the pin diameter is smaller than 0.747 inch (18.974 mm), replace the piston pin.
3. Using an inside micrometer or telescoping gauge, measure the inside diameter of the piston pin hole in
the piston at several points (Figure 13-56, Page 13-28).
4. If the inside diameter exceeds 0.7439 inch (18.895 mm), replace the piston.
Figure 13-53 Measure Ring End-Gap
Figure 13-54 Measure Piston Ring Thickness
• IT IS DIFFICULT TO MEASURE EXACTLY THE OIL RING THICKNESS. REPLACE THE OIL RING
WHENEVER THE COMPRESSION RINGS (TOP AND SECOND) ARE REPLACED.
Figure 13-55 Measure O.D. of Piston Pin
Figure 13-56 Measure I.D. of Piston Pin Hole
A
B
C
D
E
NOTE
A
2
A
1
Measure each position
in 2 places 90
°
apart.
A
B
C
D
D
C
B
A
1
1
1
1
1
1
1
1
Measure each
side in 2 places
90
°
apart.
A
1
A
2