Clean and Inspect Camshaft

1. Remove camshaft. Using a punch and hammer, remove the rear camshaft plug, if not removed previously, by driving it inward.
2. Measure the camshaft thrust (end play). Install the camshaft, thrust plate, and camshaft timing sprocket. Using a dial indicator SA9179NE (or equivalent), measure the thrust clearance while moving the camshaft back and forth. If clearance is greater than maximum, replace the thrust plate and/or camshaft.
Thrust Clearance:
Standard: 0.070 - 0.200 mm (0.028 - 0.0079 inch)
Service Limit: 0.250 mm (0.0098 inch) max.





3. Remove camshaft from camshaft housing:
a. Remove the timing chain sprocket and thrust plate.

IMPORTANT: If the camshaft is not removed through the rear of the cylinder head, an impact driver and T-40 TORE must be used to loosen the thrust plate retaining screws. TORX screws (are usually damaged during removal and) should be replaced.





b. Turn the camshaft slowly while removing it in order to prevent damage to the camshaft housing.





4. Inspect camshaft:
a. 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: 0.05 mm (0.0020 inch) max.
Service Limit: 0.07 mm (0.0028 inch) max.





b. Using a dial indicator, measure the cam lobe lift rise. Place the camshaft in V-blocks located next to the lobe being measured. If the cam lobe lift rise is less than minimum, replace the camshaft.
Cam Lobe Lift Rise (Intake and Exhaust):
Standard: 6.428 - 6.493 mm (0.2531 - 0.2556 inch)
Service Limit: 6.400 mm (0.2520 inch) min.





c. Using a micrometer, measure the journal diameter.
Journal Diameter:
Standard: 44.399 - 44.424 mm (1.748 - 1.749 inch)
Service Limit: 44.375 mm (1.747 inch) min.





d. Using an inside micrometer or gauge ball set SA91102NE (or equivalent), measure the housing bore diameter.
Bore Diameter:
Standard: 44.475 - 44.500 mm (1.751 - 1.752 inch)
Service Limit: 44.513 mm (1.753 inch) max.
e. 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 - 0.101 mm (0.0020 - 0.0040 inch)
Service Limit: 0.138 mm (0.0054 inch) max.





f. Inspect camshaft bore for flatness. Using a precision straight edge SA 9177NE (or equivalent) and feeler gauge SA 91101 NE (or equivalent), 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 inch) max.
Service Limit: 0.064 mm (0.0025 inch) max.