Piston Ring & Valve Seal Replacement Procedure

WARNING: THE ENGINE MUST BE REMOVED FROM THE VEHICLE TO PERFORM THE FOLLOWING PROCEDURE. IT IS IMPORTANT THAT THE ENGINE IS FREE OF EXTERNAL OIL LEAKS WHEN RE-ASSEMBLED.

1. Remove the engine from the vehicle.

2. Place the engine on an engine stand.

3. Remove the upper and lower intake manifolds. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

4. Remove the right hand and left hand cylinder head. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

5. Remove the oil pan and oil pump. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

6. Remove any ridge and/or deposits from the upper end of the cylinder bore with Cylinder Ridge Reamer T64L-6011-EA or equivalent. Follow the instructions furnished by tool manufacture. Never cut into the ridge travel area in excess of 0.74 mm (1/32") when removing ridges.

WARNING: DO NOT BREAK THE GLAZE OR HONE THE CYLINDER BORES. THIS WILL DISTURB THE PRODUCTION BORE FINISH AND COULD CAUSE A MORE SEVERE OIL CONSUMPTION CONCERN.

7. Make sure all the connecting rods are marked so they can be re-installed in their original positions.

8. Remove the piston and rod assemblies from the engine.

9. Remove the existing piston rings and throw them away.

Figure 2:

10. Install new piston ring sets on each piston. Make sure the ring gaps are properly spaced, Figure 2.

11. Remove the intake and exhaust valve stem seals.

12. Inspect the valve stems to make sure that they are free of nicks and burrs. Repair as required.

13. Install new guide mounted intake and exhaust valve stem seals.

NOTE: ON PASSENGER CAR ENGINES, THROW AWAY THE NYLON DISC ON THE VALVE STEMS. THE NYLON DISC WAS USED AS AN AID DURING INITIAL ASSEMBLY AND HAS NO OTHER USEFUL FUNCTION.




NOTE: REFER TO THE GASKET/SEAL APPLICATION CHART THAT FOLLOWS FOR THE CORRECT PART USAGE.

14. Re-install the piston and rod assemblies in the engine in their original locations.

15. Re-install the oil pan and oil pump. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

16. Re-install the right hand and left hand cylinder head. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

17. Re-install the upper and lower intake manifolds. Refer to the appropriate model year Shop Manual, Section 21-21 for service details.

18. Re-install the engine in the vehicle.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage, Powertrain Warranty Coverage
OPERATION DESCRIPTION TIME
900109A Perform External Inspection 0.7 Hr.
900109B Perform Oil Consumption 0.4 Hr.
Test
900109C Install Valve Seals & Piston 18.6
Rings - All Cars Except Hrs.
Thunderbird, Cougar
900109C Install Valve Seals & Piston 18.9
Rings - Bronco, F Series Hrs.
900109C Install Valve Seals & Piston 21.3
Rings - Econoline Hrs.
900109C Install Valve Seals & Piston 17.5
Rings - Thunderbird, Cougar Hrs.
DEALER CODING BASIC PART NO. CONDITION CODE
6148 40
OASIS CODES: 4100, 4101, 4104