Removal and Installation
CYLINDER HEADCAUTION:
^ When installing camshafts, chain tensioners, oil seals, or other sliding parts, lubricate contacting surfaces with new engine oil.
^ Apply new engine oil to threads and seat surfaces when installing cylinder head, camshaft sprocket, crankshaft pulley, and camshaft bracket.
^ Attach tags to valve lifters so as not to mix them up.
Removal
^ This removal is the same procedure as that for timing chain. Refer to Timing Chain.
^ Apply paint to camshaft sprockets for alignment during installation.
Installation
1. Before installing rear timing chain case, remove all traces of liquid gasket from mating surface using a scraper.
^ Also remove traces of liquid gasket from mating surface of cylinder block.
^ Remove old liquid gasket from the bolt hole and thread.
2. Before installing cam bracket, remove all traces of liquid gasket from mating surface using a scraper.
3. Remove 0-rings from cylinder block.
4. Turn crankshaft until No. 1 piston is set at approximately 240° before TDC on compression stroke to prevent interference of valves and pistons.
5. Install cylinder heads with new gaskets.
^ Do not rotate crankshaft and camshaft separately, or valves will strike piston heads.
CAUTION: Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between dl and d2 exceeds the limit, replace them with new ones.
Limit (d1 - d2): 0.11 mm (0.0043 inch)
^ Lubricate threads and seat surfaces of the bolts with new engine oil.
^ Tightening procedure:
a. Tighten all bolts to 98 Nm (10 kg-m, 72 ft. lbs.).
b. Completely loosen all bolts.
c. Tighten all bolts to 34 to 44 Nm (3.5 to 4.5 kg-m, 25 to 33 ft. lbs.).
d. Turn all bolts 90 to 95 degrees clockwise.
e. Turn all bolts 90 to 95 degrees clockwise.
^ Tighten in numerical order shown in the figure.
6. Install cylinder head outside bolts.
7. Install camshaft chain tensioners on both sides of cylinder head.
8. Install exhaust and intake camshafts and camshaft brackets.
^ Intake camshaft has a drill mark on camshaft sprocket mounting flange. Install it on the intake side.
^ Identification marks are present on camshafts.
^ Position camshaft
RH exhaust camshaft dowel pin at about 10 o'clock
LH exhaust camshaft dowel pin at about 2 o'clock
9. Before installing camshaft brackets, apply sealant to mating surface of No. 1 journal head.
^ Use Genuine RTV silicone sealant Part No. 999MP-A7007 or equivalent.
^ Refer to "POSITION FOR APPLYING LIQUID GASKET".
^ Install camshaft brackets in their original positions.
^ Tighten camshaft bracket bolts gradually in two or three stages.
^ If any part of valve assembly or camshaft is replaced, check valve clearance according to reference data. After completing assembly check valve clearance. Refer to Valve Clearance.
Reference data valve clearance (Cold):
Intake: 0.26 - 0.34 mm (0.010 - 0.013 inch)
Exhaust: 0.29 - 0.37 mm (0.011 - 0.015 inch)
^ Lubricate threads and seat surfaces of camshaft bracket bolts with new engine oil before installing them.
^ Align stamp mark as shown in the figure.
Tightening procedure
Tighten the camshaft brackets in the following steps.
^ Tighten in numerical order shown in the figure.
10. Install O-rings to cylinder block.
11. Apply sealant to the hatched portion of rear timing chain case.
^ Apply continuous bead of liquid gasket to mating surface of rear timing chain case.
^ Before installation, wipe off the protruding sealant.
12. Align rear timing chain case with dowel pins, then install on cylinder head and block.
13. Tighten rear chain case bolts.
1. Tighten bolts in numerical order shown in the figure.
2. Repeat above step (1).
^ This installation is the same procedure as that for timing chain. Refer to Timing Chain.