Heat the cylinder head to 130-140°C (275-290°F) with a hot plate or oven. Do not heat the cylinder head beyond 150°C (300°F). Use temperature indicator sticks, available from welding supply stores, to be sure the cylinder head is heated to the proper temperature.
Wear insulated gloves to avoid burns when handling the heated cylinder head.
Notice. Using a torch to heat the cylinder head may cause warpage.
Support the cylinder head and drive out the old guides from the combustion chamber side of the cylinder head.
Tools:
- IN: Valve guide driver, 6.6 mm — 07942-6570100
- EX: Valve guide driver, 8 mm — 07ZMD-MCHA100
Drive the new guides in from the camshaft side of the cylinder head while the cylinder head is still heated.
Tools:
- IN: Valve guide driver, 6.6 mm — 07942-6570100
- EX: Valve guide driver, 8 mm — 07ZMD-MCHA100
Valve guide projection above cylinder head:
- IN: 16.4-16.6 mm (0.646 - 0.654 in)
- EX: 17.7-17.9 mm (0.697 - 0.705 in)
Let the cylinder head cool to room temperature, then ream the new valve guides.
Tools:
- IN: Valve guide reamer, 6.6 mm — 07984-657010D
- EX: Valve guide reamer, 8 mm — 07ZMH-MCHA200
When reaming, do not tilt the reamer or the valve will be slanted after installation. A slanted valve will result in oil leaking past the stem seal. This will cause improper valve seat contact resulting in a valve seat that cannot be refaced.
Insert the reamer from the combustion chamber side of the head and always rotate the reamer clockwise.
Clean the cylinder head thoroughly to remove any metal particles after reaming and then reface the valve seat.
