Disassembly and Assembly

REMOVAL
1. Remove cylinder head bolts.
2. With cylinder head removed, compress valve springs using valve spring compressor tool No. MD998772, or equivalent.
3. Remove valve retaining locks, valve spring retainers and valve spring.





4. Remove valve stem seal/valve spring seat by using valve seal removal tool No. MB995037, or equivalent.
5. Before removing valves, remove any burrs from valve stem lock grooves to prevent damage to the valve guides. Identify valves to insure installation in original location.

6. Remove all gasket material from cylinder head and block.

CAUTION: Be careful not to gouge or scratch the aluminum head sealing surface.

7. Clean all valve guides, valves and valve spring assemblies thoroughly with suitable cleaning solution before reassembling.

INSTALLATION
1. Coat valve stems with clean engine oil and insert them in cylinder head.
2. If valves or seats have been reground, check valve tip height. Make sure of measurements from cylinder head surface to the top of valve stem.





3. Install valve seal/spring seat assembly over valve guides on all valve stems. Ensure that the garter spring is intact around the top of the rubber seal. Install valve springs, valve retainers.





4. Compress valve springs with a valve spring compressor. Install locks and release tool.
5. Before installing the bolts, the threads should be oiled with clean engine oil.





6. Tighten the cylinder head bolts in the sequence shown.
7. Using the 4 step torque turn method, tighten according to the following values:
Step 1:
Tighten center fasteners 1 thru 6 to 33 Nm (24 ft. lbs.), then outer fasteners 7 thru 10 to 28 Nm (20 ft. lbs.).
Step 2:
Tighten center fasteners 1 thru 6 to 67 Nm (48 ft. lbs.), then outer fasteners 7 thru 10 to 28 Nm (20 ft. lbs.).
Step 3:
Tighten center fasteners 1 thru 6 to 67 Nm (48 ft. lbs.), then outer fasteners 7 thru 10 to 28 Nm (20 ft. lbs.).
Step 4:
Turn all fasteners 1 thru 10 1/4 turn (90°).

NOTE: Do not use a torque wrench for this (4th) step.