Valve Guide Seal: Service and Repair
IN-CAR REPLACEMENTNOTE:
- Cylinder head removal is not required in this procedure.
- The procedure shown below applies when using the in- car valve spring compressor (Snap-on YA8845 with YA8845-2A 7/8" attachment or equivalent).
WARNING! Always use approved eye protection when using the in-car valve spring compressor.
1. Turn the crankshaft so that the No. 1 and the No. 4 pistons are in the top dead center (TDC) position.
2. Remove the valve cover and the rocker arm assembly.
NOTE: When removing or installing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the holders, springs and rocker arms on the shaft.
3. Remove the fuel injectors and the wire harness.
Mounting Uprights And Cross Shaft:
4. Using the 8 mm bolts supplied with the tool, mount the two uprights to the cylinder head at the end camshaft holder locations. The uprights fit over the camshaft as shown.
5. Insert the cross shaft through top holes of the two uprights.
INTAKE VALVE SEAL:
6. Select the 7/8 in. diameter long compressor attachment and fasten the attachment to the No. 5 hole of the lever arm with the speed pin supplied.
7. Position the piston at TDC and insert an air adaptor into the spark plug hole. Pump air into the cylinder to keep the valve closed while compressing springs and removing the valve keepers.
Attaching Lever Arm Correctly:
8. Position the lever arm under the cross shaft so the lever is perpendicular to the shaft and the compressor attachment rests on top of the retainer for the spring being compressed. Use the front position slot on the lever as shown.
Plug Oil Passages:
NOTE: Put shop towels over the oil passages to prevent the valve keepers from falling into the cylinder head.
9. Using a downward motion on the lever arm, compress the valve spring and remove the keepers from the valve stem. Slowly release pressure on the spring.
Valve Seal Removal:
10. Install the special tool as shown.
Removing Valve Guide Seal:
11. Remove the valve seals.
Seal I.D. And Replacement:
12. Install the valve seals.
NOTE: Exhaust and intake valve seals are NOT interchangeable.
13. Install the springs, the retainers and the keepers in reverse order of removal.
EXHAUST VALVE SEAL:
Attaching Lever Arm Correctly:
14. Select the 7/8 in. diameter short compressor attachment and fasten the attachment to the No. 4 hole of the lever arm with the speed pin supplied.
15. Position the lever arm under the cross shaft so the lever is perpendicular to the shaft and the compressor attachment rests on top of the retainer for the spring being compressed. Use the front position slot on the lever as shown.
NOTE: Put shop towels over the oil passages to prevent the valve keepers from falling into the cylinder head.
16. Using a downward motion on the lever arm, compress the valve spring and remove the keepers from the valve stem. Slowly release pressure on the spring.
Valve Seal Removal:
17. Remove the valve seals with recommended tool or equivalent.
19. Install the valve seals.
20. Install the springs, the retainers and the keepers in reverse order of removal.
21. Repeat steps 6 to 20 on the other cylinders.