Gasket - Cylinder Head

Gasket - Cylinder Head

Service Repair No - 12.29.02.01

Disassembly

1. Remove inlet manifold gasket.
2. RH cylinder head: Remove auxiliary drive belt tensioner.
3. RH cylinder head: Remove bolts securing alternator mounting bracket and remove bracket.
4. Noting their fitted order, disconnect HT leads from spark plugs.





5. Progressively remove 4 bolts securing the rocker shaft and remove rocker shaft.
6. Remove push rods and store in their fitted order.





7. Working in the sequence shown remove 10 bolts securing the cylinder head to block. Discard the bolts.
8. Remove cylinder head.





9. Remove cylinder head gasket.

CAUTION: Support both ends of cylinder head on blocks of wood.

Inspect

1. Clean mating faces of cylinder block and head using suitable gasket removal spray and a plastic scraper, ensure that bolt holes in block are clean and dry.

CAUTION: Do not use a metal scraper or machined surfaces may be damaged.





2. Check head and block faces for warping and pitting,
^ Maximum cylinder head warp = 0.05 mm (0.002 in).

NOTE: Cylinder head can be refaced to 0.50 mm (0.02 in) maximum below head height See cylinder head overhaul.

Reassembly

1. Fit cylinder head gasket with the word TOP uppermost.

CAUTION: Gaskets must be fitted dry.

2. Carefully fit cylinder head and locate on dowels.
3. Lightly lubricate new cylinder head bolt threads with clean engine oil.





4. Noting that bolts 1, 3 and 5 are longer than the remainder, fit bolts and tighten in the sequence shown to 20 Nm (15 ft. lbs.) then turn through 90° then a further 90° Do not tighten bolts 180° in one operation.
5. Clean the push rods, Lubricate ends of push rods with clean engine oil, and fit in their removed order.
6. Clean bases of rocker pillars and mating faces on cylinder head.
7. Clean contact surfaces on rockers, valves and push rods.
8. Lubricate contact surfaces and rocker shaft with clean engine oil.
9. Fit rocker shaft assembly and engage push rods.
10. Fit rocker shaft bolts and progressively tighten to 40 Nm (30 ft. lbs.).
11. Connect HT leads to spark plugs in their correct fitted order.
12. RH cylinder head: Position alternator mounting bracket, fit bolts and tighten to 40 Nm (30 ft. lbs.).
13. RH cylinder head: Fit auxiliary drive belt tensioner.
14. Fit inlet manifold gasket.