Cylinder and Camshaft Inspection SOHC

Tools Required

SA9179NE Dial Indicator

Inspection Procedure

1. Install camshaft and bearing caps. Refer to Cylinder Head Assembly procedure for additional detail.
1. Oil camshaft journals and install camshaft. Install the bearing caps with arrows on caps pointed toward camshaft sprockets, front of cylinder head.

Important

Bolt threads should be lightly oiled prior to installation. Holes must be clean and free from oil and debris.

2. Bolts must be pulled down uniformly.
Tighten

Tighten camshaft bearing cap-to-head (LL0) to 14 N·m (10 lb in)

3. Camshaft should rotate freely. If the camshaft binds, check for burrs in the cylinder head and caps journals.




2. Measure the camshaft thrust, end play. Using a SA9179NE or equivalent, measure the thrust clearance while moving each camshaft back and forth. If clearance is greater than maximum, replace the cylinder head or camshaft.
Camshaft Thrust Clearance
• Standard: 0.006-0.396 mm (0.0002-0.0156 in)
• Service Limit: 0.45 mm (0.018 in) max
3. Remove the camshafts from the cylinder head:
1. Remove the bearing caps.
2. Remove each camshaft.




4. Inspect camshaft bore for flatness. Using a precision straight edge and feeler gauge, measure the surfaces contacting the camshaft for warpage. If warpage is greater than maximum, replace the cylinder head.
Maximum Warpage
• Standard: 0.05 mm (0.0020 in) max
• Service Limit: 0.075 mm (0.003 in) max




5. Inspect camshaft:
6. Place the camshaft ends in V-blocks and, using a dial indicator or service tool SA9179NE or equivalent, measure the total runout at the center journal. If the runout is greater than maximum, replace the camshaft.
Circle Total Runout
• Standard: 0.080 mm (0.003 in) max
• Service Limit: 0.120 mm (0.0047 in) max




7. Using a dial indicator, measure the cam lobe lift rise. Place the camshaft in V-blocks located next to the lobe being measured.




8. If the cam lobe lift/rise is less than minimum, replace the camshaft.
Cam Lobe Lift Rise
• Standard: 5.183-5.263 mm (0.2042-0.2074 in) max
• Service Limit: 5.133 mm (0.203 in) max




9. Using a micrometer, measure the journal diameter.
Journal Diameter
• Standard: 26.950-26.970 mm (1.0638-1.0648 in) max
• Service Limit: 26.925 mm (1.0608 in) max




10. Using an inside micrometer or SA91102NE or equivalent, measure the housing bore diameter.
Bore Diameter
• Standard: 44.475-44.500 mm (1.751-1.752 in) max
• Service Limit: 44.513 mm (1.753 in) max
11. Subtract the journal diameter measurement from the housing bore diameter measurement. If the clearance is greater than maximum, replace the camshaft and/or cylinder head.
Oil Clearance
• Standard: 0.51-1.101 mm (0.0020-0.0040 in) max
• Service Limit: 0.138 mm (0.0054 in) max




12. Inspect camshaft bore for flatness. Using a precision SA9177NE and SA91101NE , measure the surfaces contacting the camshaft for warpage. If warpage is greater than maximum, replace the cylinder head.
Maximum Warpage
• Standard: 0.05 mm (0.0020 in) max
• Service Limit: 0.064 mm (0.0025 in) max