Camshaft: Service and Repair

CAM SHAFT





COMPONENTS

DISASSEMBLY
1. Remove the engine cover and intake manifold.
2. Disconnect the breather hose and the engine harness.
3. Remove the power steering pulley, air conditioner pulley, crankshaft pulley, idler pulley and tensioner pulley.
4. Remove the timing belt cover.
5. Loosen the auto tensioner.
6. Remove the timing belt from the camshaft sprocket.
7. Remove the spark plug cables.





8. Loosen the cylinder head cover bolts and then remove it.
9. Remove the camshaft sprockets.





10. Remove the camshaft bearing caps.





11. Remove the camshafts.

INSPECTION
CAMSHAFTS
1. Check the camshaft journals for wear. If the journals are badly worn out, replace the camshaft.





2. Check the cam lobes for damage. If the lobe is damaged or excessively worn out, replace the camshaft.
Cam height
Standard
Intake: 35.098 - 35.298 mm (1.3818 - 1.3897 inch)
Exhaust: 34.81 - 35.01 mm (1.3705 - 1.3783 inch)
3. Check the cam surface for abnormal wear or damage, and replace if necessary.
4. Check each bearing for damage. If the bearing surface is excessively damaged, replace the cylinder head assembly or camshaft bearing cap, as necessary.
Camshaft end play: 0.1 - 0.15 mm(0.0039 - 0.0059 inch)

OIL SEAL (CAMSHAFT FRONT)
1. Check the lips for wear. If lip threads are worn out, replace the oil seal with new one.
2. Check a contact surface of oil seal lip on camshaft. If there stratified wear, replace the camshaft.

HLA (HYDRAULIC LASH ADJUSTER)








With the HLA filled with engine oil, hold A and press B by hand. If B moves, replace the HLA.

AUTO LASH ADJUSTER
1. Check auto - lash adjusters for free play by inserting a small wire through the air bleed hole in the rocker arm and push the auto lash adjuster check ball down very lightly.





2. While lightly holding the check ball down move the rocker arm up and down to check for free play. If there is no play replace the auto- lash adjuster.

REASSEMBLY
CAMSHAFT AND BEARING CAP
1. Rotate the crankshaft and No. 1 cylinder is in TDC (Compression stroke)
2. Check the position of the rocker arm whether it is exactly installed on the lash adjuster and valve or not.








3. Install the camshaft dowel pin as illustration.





4. The left and right banks of the camshafts are different and you should be careful not to confuse them.
Identification mark
Left bank
Intake (IN): I
Exhaust (Ex): E
Right bank
Intake (IN): J
Exhaust (Ex): H





5. Confirm the identification mark and the number. Bearing caps of No.2 No.3 and No.4 have the front mark and arrange the front mark upon the cylinder head while installing the bearing caps.
Identification mark
Intake: I
Exhaust: E





6. Tighten the bearing cap by 2 or 3 steps.
Tightening Torque
Outer (a) 16EA: 18.6 - 20.6 Nm (1.9 - 2.1 kg-m, 13.7 - 15.2 ft. lbs.)
Inner 24 EA: 9.8 - 11.8 Nm (1.0 - 1.2 kg-m, 7.2 - 8.7 ft. lbs.)
7. Install the cylinder head cover.
1) Install the gasket to the cylinder head cover correctly.
2) Clean sealing surface on camshaft cap.

NOTE: Clean sealing surface with use plastic scraper, to prevent oil leak.





3) Apply sealant to the sealing surface on cylinder head cover and camshaft cap.
Sealant type: LT 5900





NOTE: Be careful of gasket escapement when installing the cylinder head cover. You must use the washer when installing the cylinder head cover bolts.