Procedure B
PROCEDURE B:Valve Guide Height Correction, Snap Ring Installation
1. Remove the cylinder head using the procedure in the appropriate service manual.
2. Remove all of the valve spring assemblies and valves. Mark the valves so they can be returned to their original position at reassembly.
3. Remove all of the valve stem seals.
4. Check the height on any exhaust valve guides not already checked to determine if height correction will be required on more than one guide.
5. Remove any carbon from the bottom of the exhaust valve guides that need to have their height corrected, especially the face that special tool MD998115 will contact.
6. Using special tool MD998115 and hammer, carefully drive the exhaust valve guides from the combustion chamber side to provide a valve guide height from the top of the guide to the top of the boss for the valve guide on the cylinder head of .453" (11.5 mm). Check the distance using the height gauge that is integrated into the groove cutter (Special tool MD998790). Refer to Figure 1 and Figure 5. If the valve guide is driven up too far and the valve guide height exceeds .453" (11.5 mm) use special tool MD998115 to drive the valve guide from the rocker shaft side of the head until the .453" (11.5 mm) height is achieved.
7. Inspect the valve seats using the prussian blue procedure in the appropriate service manual.
8. Using the groove cutter (Special tool MD998790), make a groove on all of the exhaust valve guides (refer to Fig. 2 and 3).
a. Install the special tool on the exhaust valve guide.
b. Turn the tool clockwise until the force required to turn the tool suddenly decreases.
c. Remove the tool.
9. Use a magnet and shop towel or wash the cylinder head to remove the cuttings.
10. Install a snap ring on each exhaust valve guide (refer to fig. 4).
11. Check the exhaust valve guide height with the .453" (11.5 mm) side of special tool MD998790 and a .040" (1 mm) feeler gauge. If the measurement is .413 (10.5 mm) or more (feeler gauge will not fit between special tool and top of valve guide) install the valve spring seat. Install all of the intake valve spring seats.
12. Install new valve stem seals on the intake and exhaust valve guides using special tool MD998729.
13. Reassemble the cylinder head and install using the procedure in the appropriate service manual. Return to step 8 of the REPAIR PROCEDURE unless this step completed the repair to both heads.
14. Using the procedures in the appropriate service manual, reassemble the engine.
POLICY:
Reimbursable within the provisions of the warranty.