Engine Unit (W/ Glow Plug Controller) Inspection

Check that the bearing is not rough or worn.
If necessary, replace the injection gear.

Using a cylinder gauge, measure the inside diameter of the idle gear.

Standard idle gear inside diameter:

44.000 to 44.025 mm (1.732 to 1.734 in.)

Using a micrometer, measure the diameter of the idle gear shaft.

Standard idle gear shaft diameter:

43.955 to 43.990 mm (1.730 to 1.732 in.)

Subtract the idle gear shaft diameter measurement from the idle gear inside diameter measurement.

Standard oil clearance:

0.01 to 0.07 mm (0.000394 to 0.00276 in.)

Maximum oil clearance:

0.20 mm (0.00787 in.)

Using a precision straightedge and feeler gauge, measure the warpage of the surface of the intake manifold that contacts the cylinder head.

Maximum warpage:

0.4 mm (0.0157 in.)

Using a precision straightedge and feeler gauge, measure the warpage of the surface of the exhaust manifold that contacts the cylinder head.

Maximum warpage:

0.4 mm (0.0157 in.)

Inspect the circle runout.

1. Place the camshaft on V-blocks.
   

2. Using a dial indicator, measure the circle runout at the center journal.
   

   Maximum circle runout:

   0.03 mm (0.00118 in.)
   

   If the circle runout is more than the maximum, replace the camshaft.
   

Inspect the cam lobe height.

1. Using a micrometer, measure the cam lobe height.
   

   Standard cam lobe height:

   46.99 to 47.09 mm (1.850 to 1.854 in.)
   

   Minimum cam lobe height:

   46.57 mm (1.833 in.)
   

   If the cam lobe height is less than the minimum, replace the camshaft.
   

Inspect the diameter of the camshaft journal.

1. Using a micrometer, measure the diameter of the camshaft journal for the camshaft bearing.
   

   Standard diameter:

   27.969 to 27.985 mm (1.101 to 1.102 in.)
   

   If the diameter is not as specified, check the oil clearance.
   

Using a dial indicator, measure the backlash.

1. Install the 2 camshafts.
   

2. Using a dial indicator, measure the backlash.
   

   Standard backlash:

   0.035 to 0.089 mm (0.00138 to 0.00350 in.)
   

   Maximum backlash:

   0.189 mm (0.00744 in.)
   

   If the backlash is more than the maximum, replace the 2 camshafts.
   

3. Remove the 2 camshafts.
   

Inspect the circle runout.

1. Place the camshaft on V-blocks.
   

2. Using a dial indicator, measure the circle runout at the center journal.
   

   Maximum circle runout:

   0.03 mm (0.00118 in.)
   

   If the circle runout is more than the maximum, replace the camshaft.
   

Inspect the cam lobe height.

1. Using a micrometer, measure the cam lobe height.
   

   Standard cam lobe height:

   48.31 to 48.41 mm (1.902 to 1.906 in.)
   

   Minimum cam lobe height:

   48.16 mm (1.896 in.)
   

   If the cam lobe height is less than the minimum, replace the camshaft.
   

Inspect the diameter of the camshaft journal.

1. Using a micrometer, measure the diameter of the camshaft journal for the camshaft bearing.
   

   Standard diameter:

   27.969 to 27.985 mm (1.101 to 1.102 in.)
   

   If the diameter is not as specified, check the oil clearance.
   

Clean the bearing caps and journals.

Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.

Place the camshaft on the cylinder head.

Lay a strip of Plastigage across each of the journals.

Install the bearing caps.

NOTICE:

Do not turn the camshaft.

Remove the bearing caps.

Measure the Plastigage at its widest point.

Standard oil clearance:

0.025 to 0.062 mm (0.000984 to 0.00244 in.)

Maximum oil clearance:

0.1 mm (0.00394 in.)

Completely remove the Plastigage.

Remove the camshaft.

Install the camshaft.

Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

Standard thrust clearance:

0.035 to 0.185 mm (0.00138 to 0.0728 in.)

Maximum thrust clearance:

0.25 mm (0.00984 in.)

Remove the camshaft.

Using a vernier caliper, measure the diameter of the most elongated threads in the measurement area.

Standard outside diameter:

11.76 to 11.97 mm (0.463 to 0.471 in.)

Minimum outside diameter:

11.6 mm (0.457 in.)

HINT:

If a visual check reveals no excessively thin areas, check the center of the bolt (see illustration) and find the area that has the smallest diameter.