Camshaft: Service and Repair
REMOVAL
Related Parts
Remove timing belt, camshaft sprockets and related parts.
Camshaft
1) Remove camshaft position sensor (left-hand side only)
2) Remove spark plug cord.
3) Remove rocker cover and gasket.
Intake Camshaft Cap Bolt Removal Sequence:
4) Loosen intake camshaft cap bolts equally, a little at a time in alphabetical sequence shown in figure,
5) Remove camshaft caps and intake camshaft.
Exhaust Camshaft Cap Bolt Removal Sequence:
6) Loosen exhaust camshaft cap bolts equally, a little at a time in alphabetical sequence shown in figure.
7) Remove camshaft caps and exhaust camshaft.
CAUTION: Arrange camshaft caps in order so that they can be installed in their original positions.
8) Similarly, remove right-hand camshafts and related parts.
INSPECTION
Camshaft
1) Measure the bend, and repair or replace if necessary.
Limit: 0.020 mm (0.0008 inch)
2) Check journal for damage and wear. Replace if faulty.
3) Measure outside diameter of camshaft journal. If the journal diameter is not as specified, check the oil clearance.
4) Measurement of the camshaft journal oil clearance
1) Clean the bearing caps and camshaft journals.
2) Place the camshafts on the cylinder head. (Without installing valve rocker.)
3) Place plastigauge across each of the camshaft journals.
4) Install the bearing caps.
CAUTION: Do not turn the camshaft.
5) Remove the bearing caps.
6) Measure the widest point of the plastigauge on each journal.
If the oil clearance exceeds the limit, replace the cam shaft. If necessary, replace the camshaft caps and cylinder head as a set.
Standard oil clearance: 0.037 - 0.072 mm (0.0015 - 0.0028 inch)
Limit: 0.10 mm (0.0039 inch)
7) Completely remove the plastigauge.
5) Check cam face condition; remove minor faults by grinding with oil stone. Measure the cam height H; replace if the limit has been exceeded.
Cam height:
H Standard:
Intake: 42.20 - 42.30 mm (1.6614 - 1.6654 inch)
Exhaust:
Front: 42.50 - 42.60 mm (1.6732 - 1.6772 inch)
Rear: 41.40 - 41.50 mm (1.6299 - 1.6339 inch)
Limit:
Intake: 42.04 mm (1.6551 inch)
Exhaust:
Front: 42.34 mm (1.6669 inch)
Rear: 41.24 mm (1.6236 inch)
Cam base circle diameter A: 28.0 mm (1.102 inch)
6) Measure the thrust clearance of camshaft with dial gauge. If the clearance exceeds the limit, replace caps and cylinder head as a set. If necessary replace camshaft.
Standard: 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Limit: 0.1 mm (0.004 inch)
INSTALLATION
Camshaft
1) Camshaft installation
Apply engine oil to cylinder head at camshaft bearing location before installing camshaft. Install camshaft so that rocker arm is close to or in contact with "base circle" of cam lobe.
CAUTION:
- When camshafts are positioned as shown in figure, camshafts need to be rotated at a minimum to align with timing belt during installation.
- Right-hand camshaft need not be rotated when set at position shown in figure.
Left-hand intake camshaft: Rotate 80° clockwise.
Left-hand exhaust camshaft: Rotate 45° counter-clockwise.
2) Camshaft cap installation
1) Apply fluid packing sparingly to cap mating surface.
CAUTION: Do not apply fluid packing excessively. Failure to do so may cause excess packing to come out and flow toward oil seal, resulting in oil leaks.
Fluid packing:
THREE BOND 1215 or equivalent
Intake Camshaft Cap Bolts Tightening Sequence; Tighten Exhaust Camshaft Cap Bolts Similarly:
2) Apply engine oil to cap bearing surface and install cap on camshaft as shown by identification mark.
3) Gradually tighten cap in at least two stages in alphabetical sequence shown in figure, and then tighten to specified torque.
Torque specification:
T2, 7.2 ft. lbs. +\- 0.5 (10 Nm +\- 0.7)
T3, 14.5 ft. lbs. +\- 1.4 (20 Nm +\- 2)
4) Similarly, tighten cap on exhaust side.
After tightening cap, ensure camshaft rotates only slightly while holding it at "base" circle.
3) Camshaft oil seal installation
Apply grease to new oil seal lips and press onto front end of camshaft by using ST1 and ST2.
CAUTION: Use a new oil seal.
ST1 499587100 OIL SEAL INSTALLER
ST2 499597000OIL SEAL GUIDE
4) Rocker cover installation
1) Install gasket on rocker cover, Install peripheral gasket and ignition coil gasket.
2) Apply fluid packing to four front open edges of peripheral gasket.
Fluid packing: THREE BOND 1215 or equivalent
3) Install rocker cover on cylinder head. Ensure gasket is properly positioned during installation.
5) Install ignition coil.
6) Install cam angle sensor.
7) Similarly, install parts on right-hand side.
Related Parts
Install timing belt, camshaft sprockets and related parts.