Inspection

INSPECTION

TIMING BELT





Replace the belt if any of the following conditions exist.
1. Hardening of rubber backing.
Back side is glossy without resilience and leaves no indent when pressed with fingernail.





2. Cracks on rubber back.
3. Cracks or peeling of canvas.
4. Cracks on tooth bottom.
5. Cracks on belt.





6. Abnormal wear of belt sides. Normal wear is indicated if the sides are sharp as if cut by a knife. Abnormal wear is indicated if the sides are ragged.





7. Abnormal wear on teeth.
Initial stage:
Canvas worn (fluffy canvas fibers, rubbery texture gone, white discoloration, canvas texture indistinct)
Final stage:
Canvas worn, exposing rubber (tooth width reduced)
8. Missing tooth.

TENSIONER PULLEY AND IDLER PULLEY





Turn the pulley. If it does not rotate smoothly, or develops noise or excessive play, replace the pulley.

AUTO-TENSIONER

[In case that the amount of rod protrusion is 5 mm with the set pin inserted.]





1. Check for oil leaks. If oil leaks are evident, replace the auto-tensioner.
2. Check the rod end for wear or damage and replace the auto-tensioner if necessary.
3. Measure the rod protrusion. If it is out of specification, replace the auto-tensioner.
Standard value: 12 mm (0.5 inch)






4. Press the rod with a force of 98 to 196 N (22 to 44 pounds) and measure the movement of the rod.
If the measured value is out of the standard value, replace the auto-tensioner.
Standard value: 1.0 mm (0.03 inch) or less


AUTO-TENSIONER

[In case that the amount of rod protrusion is 1 mm with the set pin inserted.]





1. Check the auto tensioner for oil leaks from the sealed sections. Replace it if there is a leak.
2. Check the rod end for wear and other wear and other damage. Replace the auto tensioner if necessary.
3. Measure the length of rod protrusion. If it deviates from the standard value, replace the auto tensioner.
Standard value: 13.5 - 14.5 mm (0.532 - 0.570 inch)






4. Measure the amount of the retraction when the rod is pressed with the force of 100 - 200 N (23 - 44 lb). If it deviates from the standard value, replace the auto tensioner.
Standard value: within 1.0 mm (0.04 inch)


AIR BLEEDING PROCEDURE OF AUTO-TENSIONER

[In case that the amount of rod protrusion is 1 mm with the set pin inserted.]

When the auto tensioner is not kept with its rod upward, or when the set pin having dia. 2 mm (0.08 inch) is pulled out before the installation to the engine, carry out the air bleeding as follows.

CAUTION:

- If the lateral type press is used, the appropriate air bleeding is not carried out. Always use longitudinal type press.

- To prevent damage to the auto tensioner, do not apply the load of 5,000N (1,124 lb) or more.

- To prevent damage to the auto tensioner, do not press the rod below the cylinder end plane.





1. Set the auto tensioner to the longitudinal type press as shown in the illustration.
2. Slowly press down the rod, two or three times, to the cylinder end plane.
3. When the rod protrusion has approximately 5 mm (0.20 inch), apply the load of 100 - 200 N (23 - 44 lb). Check whether the auto tensioner has sufficient stiffness.
4. If the auto tensioner does not have sufficient stiffness, replace the auto tensioner.
5. Slowly pressing down the rod, insert the set pin having dia. 2 mm (0.08 inch) through the hole to fix the auto tensioner.

CAUTION:
To prevent the air from being incorporated, keep the auto tensioner with its rod upward after the air bleeding.

VALVE CLEARANCE ADJUSTMENT

Adjust the valve clearance as follows:





1.
CAUTION:
Rotate the crankshaft clockwise at any time.

Rotate crankshaft clockwise and then align the timing mark on the camshaft sprocket with the timing mark on the rocker cover. (Place Number 1 cylinder on the top dead center of compression stroke.)

NOTE:
Align the timing mark, on the right bank, with F.

2. Remove the rocker cover.





3. Measure the valve clearances marked with arrows shown in the illustration.
A: When Number 1 cylinder is on the top dead center of compression stroke.
B: When Number 4 cylinder is on the top dead center of compression stroke.





4. Using a thickness gauge, adjust the clearance between the valve shaft end and the adjusting screw.
Standard value (in cold state): 0.10 mm (0.004 inch)

NOTE:
After the engine assembly is installed on the vehicle, check the valve clearance again with the engine warmed up. Adjust if necessary.

5. Hold the adjusting screw with a screwdriver so it does not rotate then tighten the lock nut.
6. Rotate the crankshaft one time clockwise and then align the timing mark with the timing mark on the crankshaft sprocket. (Place Number 4 cylinder on the top dead center of compression stroke.)
7. Adjust the valve clearance for the rest of the valves.
8. Install the rocker cover.