41. Camshafts Clean and Inspect

Camshafts Cleaning and Inspection

^ Tools Required
- J 7872 Magnetic Base Dial Indicator
- SA9179NE Dial Indicator

Camshaft Inspection





1. Clean the camshaft and inspect for pitted, scored or excessively worn lobes.
2. Measure the diameter of each bearing journal.





3. Important: In order to properly measure the camshaft journal bores, the rocker arm shafts must be bolted to the cylinder heads.

Remove the rocker arms (215, 218) and springs (219) from the shafts (220, 221).
4. Lubricate the bolt threads and flanges with clean engine oil.
5. Install the rocker arm shafts and bolts to the cylinder heads.





6. Notice: Refer to Fastener Notice in Service Precautions.

Tighten the left cylinder head rocker shaft bolts in sequence.
1 Tighten the bolts a first pass to 12 Nm (106 inch lbs.).
2 Tighten the bolts a final pass to 24 Nm (17 ft. lbs.).





7. Tighten the right cylinder head rocker shaft bolts in sequence.
1 Tighten the bolts a first pass to 12 Nm (106 inch lbs.).
2 Tighten the bolts a final pass to 24 Nm (17 ft. lbs.).





8. Clean the bearing surfaces in the cylinder head and measure the inside diameter (I.D.) of each camshaft bearing surface. Also check for an out-of-round condition.
9. Calculate the camshaft-to-journal clearance.
^ Camshaft-to-journal clearance - new: 0.05 - 0.2 mm (0.002 - 0.008 inch)
^ Camshaft-to-journal clearance - service limit: 0.2 mm (0.008 inch)





10. Install the camshaft into V-blocks and use the J 7872 to measure the runout.
^ Camshaft total runout - new: 0.03 mm (0.001 inch)
^ Camshaft total runout - service limit: 0.04 mm (0.002 inch)





11. Identify the camshaft lobes.
^ Exhaust (1)
^ Intake primary - right cylinder head (2)
^ Intake mid (3)
^ Intake secondary - right cylinder head (4)
^ Intake secondary - left cylinder head (5)
^ Intake primary - left cylinder head (6)
12. Measure the camshaft lobe height. If the measurement is less than the specification, replace the camshaft.
^ Intake primary lobe height: 35.041 mm (1.3796 inch)
^ Intake mid lobe height: 36.445 mm (1.4348 inch)
^ Intake secondary lobe height: 35.284 mm (1.3891 inch)
^ Exhaust lobe height: 36.326 mm (1.4302 inch)

Measuring Camshaft End Play





1. Important: In order to properly measure camshaft end play, the rocker arm shafts must be bolted to the cylinder heads.

Remove the rocker arms (215 and 218) and springs (219) from the shafts (220 and 221).
2. Lubricate the bolt (214) threads and flanges with clean engine oil.
3. Install the rocker arm shafts (220, 221) and bolts (214) to the cylinder heads.





4. Notice: Refer to Fastener Notice in Service Precautions.

Tighten the left cylinder head rocker shaft bolts in sequence.
1 Tighten the bolts a first pass to 12 Nm (106 inch lbs.).
2 Tighten the bolts a final pass to 24 Nm (17 ft. lbs.).





5. Tighten the right cylinder head rocker shaft bolts in sequence.
1 Tighten the bolts a first pass to 12 Nm (106 inch lbs.).
2 Tighten the bolts a final pass to 24 Nm (17 ft. lbs.).





6. Install the camshafts (209), caps (211), and bolts (212).
Tighten the bolts to 22 Nm (16 ft. lbs.).





7. Seat the camshaft by pushing it toward the rear of the cylinder head.
8. Use the SA9179NE in order to measure the end play. Zero the dial indicator against the end of the camshaft. Push the camshaft forward and rearward and measure the end play.
^ Camshaft end play - new: 0.05 - 0.2 mm (0.002 - 0.008 inch)
^ Camshaft end play - service limit: 0.2 mm (0.008 inch)