Flywheel and Damper – Inspect and adjust


Alignment of the Flywheel Face


Set the pointer of the dial indicator to 0 mm (0 inch).
Turn the flywheel. Read the dial indicator for every 45 degrees. During the check, keep the crankshaft pressed toward the front of the engine in order to remove any end clearance.
Calculate the difference between the lowest measurement and the highest measurement of the four locations. This difference must not be greater than 0.03 mm (0.001 inch) for every 25 mm (1.0 inch) of the radius of the flywheel. The radius of the flywheel is measured from the axis of the crankshaft to the contact point of the dial indicator.

Flywheel Runout


Set the pointer of the dial indicator to 0 mm (0 inch).
Turn the flywheel. Read the dial indicator for every 45 degrees.
Calculate the difference between the lowest measurement and the highest measurement of the four locations. This difference must not be greater than 0.30 mm (0.012 inch).

Concentricity and Alignment of the Flywheel Housing


This check must be made with the flywheel and the starter removed and the bolts for the flywheel housing tightened lightly.


Set the pointer of the dial indicator to 0 mm (0 inch).
Check the concentricity at intervals of 45 degrees around the flywheel housing.
Calculate the difference between the lowest measurement and the highest measurement. This difference must not be greater than the limit that is given in Table. Any necessary adjustment must be made on the flywheel housing. Then, recheck the concentricity.

Inspect  the Gear Group

(1) Camshaft gear (2) Idler gear (3) Fuel injection pump gear (4) Crankshaft gear

Inspect the gears for wear or for damage. If the gears are worn or damaged, use new parts for replacement.


Measure the backlash between the camshaft gear (1) and the idler gear (2). 
Measure the backlash between the idler gear (2) and the crankshaft gear (4).
Measure the backlash between the fuel injection pump gear (3) and the idler gear (2). Measure the end play on idler gear (2).

Vibration Damper adjust

The vibration damper is installed on the front of the crankshaft. There are two types of hub assembly that can be installed to this engine. The vibration damper is installed in order to help remove torsional vibration in the engine.

Vibration damper with hub assembly
(1) Crankshaft adapter (2) Pulley (3) Vibration damper (4) Damper setscrews (5) Setscrews for the adapter (6) Hub assembly

Vibration damper with out hub assembly

Replace the vibration damper if any of the following conditions exist:
• There is any impact damage to the outer casing.
• There is leakage of the viscous fluid from the cover plate.
• There is movement of the pulley or the outer ring on the hub.
• There is a large amount of gear train wear that is not caused by lack of oil.
• Analysis of the engine oil has revealed that the front main bearing is badly worn.
• The engine has had a failure because of a broken crankshaft.
Check the areas around the holes for the bolts in the vibration damper for cracks or for wear and for damage. Use the following steps in order to check the alignment and the runout of the vibration damper:
Remove any debris from the front face of the vibration damper. Remove any debris from the circumference of the vibration damper.
Mount the dial indicator on the front cover. Use the dial indicator to measure the outer face of the vibration damper. Set the dial indicator to read 0.00 mm (0.00 inch).
Rotate the crankshaft at intervals of 45 degrees and read the dial indicator.
The difference between the lower measurements and the higher measurements that are read on the dial indicator at all four points must not be more than 0.18 mm (0.007 inch). If the reading on the dial indicator is more than 0.18 mm (0.007 inch), inspect the pulley and the vibration damper for damage. If the pulley or the vibration damper are damaged, use new parts for replacement.
Move the dial indicator so that the dial indicator will measure the circumference of the vibration damper. Set the dial indicator to read 0.00 mm (0.00 inch).
Slowly rotate the crankshaft in order to measure the runout of the circumference of the vibration damper. Use the highest reading and the lowest reading on the dial indicator. The maximum and the minimum readings on the dial indicator should not vary more than 0.12 mm (0.005 inch). If the reading on the dial indicator is more than 0.12 mm (0.005 inch), inspect the pulley and the vibration damper for damage. If the pulley or the vibration damper are damaged, use new parts for replacement.