FE290 ENGINE
Piston and Connecting Rod
Page 13-26 2000 FE290 Gasoline Vehicle Maintenance and Service Supplement
13
Piston and Connecting Rod Separation
1. Remove two retaining rings holding the piston pin in place.
2. Remove the piston pin.
Piston Inspection and Repair
1. Remove all deposits from the piston.
2. Clean the carbon from the piston ring grooves. See following CAUTION.
3. Be sure the oil return passages in the ring grooves are open.
4. Visually inspect the piston rings and ring grooves for uneven wear or damage. Replace the piston and/
or piston rings if uneven wear or damage is present or if they exceed the wear limits.
5. Using a new piston ring and a feeler gauge, measure the clearance between the grooves and ring at
several points around the grooves (Figure 13-52, Page 13-27).
6. If the top groove has a clearance greater than 0.0063 inch (0.16 mm), replace the piston.
7. If the second groove has a clearance greater than 0.0055 inch (0.14 mm), replace the piston.
8. The oil ring is made of three pieces: upper and lower rails and expander. It is difficult to measure the
ring groove clearance and thickness. Inspect visually for wear or damage.
Piston Ring Inspection
1. Insert the ring squarely into the cylinder bore to a point approximately 1 inch (25 mm) down from the
top the cylinder. See following NOTE.
2. Using a feeler gauge, measure the ring end-gap (Figure 13-53, Page 13-28).
• NEVER CLEAN THE PISTON HEAD WITH THE ENGINE ASSEMBLED. CARBON PARTICLES
WILL FALL BETWEEN THE PISTON AND CYLINDER WALL AND MAY CAUSE SEVERE
CYLINDER WEAR.
Figure 13-51 Connecting Rod Cap Bolts
Figure 13-52 Measure Piston Ring and
Groove Clearance
• USE THE TOP OF THE PISTON TO PUSH THE RING INTO THE BORE TO BE SURE IT IS
SQUARE.
CAUTION
1
2
NOTE
