Cylinder Head Assembly: Service and Repair

1. Remove timing belt cover, timing belt, rocker assembly and camshaft as outlined previously.
2. Remove exhaust manifold, then disconnect wiring harnesses from intake manifold.
3. Remove air suction valve and pipe, if applicable.
4. Remove intake manifold attaching bolts, then the intake manifold together with carburetor.

Fig. 30 Cylinder Head Bolt Tightening Sequence:

5. Remove cylinder head bolts in reverse sequence as that shown in Fig. 37, then remove cylinder head from crankcase.
6. Using suitable valve spring compressor tool, compress valve springs and remove retainer keys.
7. Remove retainers, springs, valves and valve seals.
8. Coat valve seals with engine oil, then install seals using tool 398852100 or equivalent. Intake and exhaust seals are not interchangeable. Intake seals measure .512 inch high, while exhaust seals are .425 inch high. Ensure seals are installed correctly.
9. Coat valve stems with engine oil, then install valves into guides.
10. Install springs, with close-coiled end facing cylinder head, and retainers, then compress spring and install retainer key. Tap retainer lightly with mallet to seat key.
11. Install cylinder head onto crankcase using new gaskets.
12. Apply engine oil to head bolt threads, then install bolts through cylinder head and into crankcase.

Fig. 30 Cylinder Head Bolt Tightening Sequence:

*** UPDATED BY TSB-02-52-87 AUGUST, 1990.
13. Torque cylinder head bolts in two steps in sequence shown, Fig. 37. First Torque bolts to 29 ft.lbs.Then, tighten to 54 ft.lbs.
14. Back off each head bolt 1/4 turn in reverse order of tightening sequence. Finally re-torque to 54 ft.lbs.
15. Install intake manifold and carburetor assembly and torque attaching bolts to 14-22 ft.lbs.
16. Install air suction valve and pipe, if applicable, then reconnect wiring harnesses at intake manifold.
17. Install exhaust manifold and torque attaching bolts to 14-22 ft.lbs.
18. Install camshaft, rocker assembly, timing belt and timing belt cover as outlined previously.