Inspection

CAMSHAFT

Check the cam and journal surfaces of the camshaft for scoring, scratches or evidence of insufficient lubrication.

Check the oil holes in the camshaft for clogs.

Support both ends of the camshaft with V-blocks and check the camshaft runout with a dial gauge.

Using a micrometer, measure each cam lobe height.

SERVICE LIMITS: IN: 36.5 mm (1.44 in) EX: 35.3 mm (1.39 in)

CAMSHAFT HOLDER

Inspect the bearing surface of the camshaft holder for scoring, scratches, or evidence of insufficient lubrication.

Inspect the oil orifices of the holders for clogs.

CAMSHAFT HOLDER

CAMSHAFT HOLDER

CAM CHAIN GUIDE B

Inspect the cam chain slipper surface of the cam chain guide for wear or damage.

CAM CHAIN GUIDE B

CAMSHAFT OIL CLEARANCE

Remove the cylinder head and valves (page 8-11).

Wipe any oil from the journals of the camshaft, cylinder head and camshaft holders.

Lay a strip of plastigauge lengthwise on lop of each camshaft journal.

Do nor roiaio it\g Install the camshaft holder onto the camshafts.

camshet* when Apply engine oil to the threads and seating surfaces usingplastigauge 0f camshaft holder bolts.

Install the twenty holder bolts with the eight sealing washers.

In case the valves in cylinder head:

The camshaft holder have lire number "1 thru 20".

Temporarily tighten the four bolts of the center area gradually in the sequence 6 5 8- 7 until the dowel pins on the camshaft holder inserts into the pin holes in the cylinder head properly. (The clearance between the holder and head is 1 - 5 mm)

Next tighten the all holder bolts in numerical order cast on the camshaft holder (1 thru. 20) in several steps, then tighten them to the specified torque.

Remove the camshaft holders and measure the width of each plastigauge.

The widest thickness determines the oil clearance.

When the service limits are exceeded, replace the camshaft and rcchcck the oil clearance. Replace the cylinder head and camshaft holders as a set if the clearance still exceeds the service limit.

PLASTIGAUGE

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