Camshafts, Chain and Sprockets

CAMSHAFT, CAM CHAIN, AND CAM SPROCKET

Camshaft

1. Measure:
• Large cam lobe length 1
• Small cam lobe length 2

 Use a micrometer. Replace if out of specification.

 

	Intake [Limit]	Exhaust [Limit]
1	32.45 mm (1.2776 in)	32.30 mm (1.2727 in)
2	24.85 mm (0.9783 in)	24.85 mm (0.9783 in)

 

Camshaft/Cap Clearance Measurement 

1. Install:
• Intake camshaft
• Exhaust camshaft

2. Position a strip of Plastigage® (YU-33210) 1 onto camshaft.

3.  Install the camshaft caps 1

4.  Tighten the camshaft cap bolts

Camshaft Cap Bolts: 10 Nm (1.0mkg, 7.2ft-lb)

NOTE:
Do not turn the camshaft when measuring clearance with Plastigage.

5. Remove the camshaft caps

6. Measure the width of Plastigage® 1
 Out of specification -> Follow step 7 .

Camshaft-to-cap Clearance: 0.050 - 0.084 mm (0.0020- 0.0033 in)

7. Measure the camshaft bearing surface diameter 1. Use a micrometer.

Out of specification ->  Replace camshaft. 
Within specification ->  Replace cylinder head.

Camshaft Bearing Surface Diameter:

Standard: 24.437~24.450mm (0.9621-0.9626 in) 
Cam Cap Inside Diameter: Standard: 2 4 .500-24.521 mm (0.9646-0.9654 in)

Cam Chain Tensioner

 

1   One way cam
2   End plug
3   Washer
4   Spring
5   Tensioner body
6   Tensioner rod
7   Gasket

1.  Check the one-way cam operation.  Replace if operation is not smooth.

2.  Inspect: all parts for damage and wear. Replace as necessary.

Cam Chain

1. Inspect: 
• Cam chain 
Chain stretch/Cracks->  Replace

Cam Sprockets

1. Inspect the cam sprockets for wear/damage. Replace worn sprockets.

Chain Guide

1. Inspect:

• Upper chain guide 1
• Exhaust side chain guide 2
• Intake side chain guide 3  

Replace worn parts.