Inspection

1. INSPECT BALANCESHAFT THRUST CLEARANCE

(a) Install the balanceshafts (See page EM-149).

(b) Using a dial indicator, measure the thrust clearance while moving the balanceshaft back and forth. Standard thrust clearance:

0.05 to 0.09 mm (0.0020 to 0.0035 in.) Maximum thrust clearance:

0.09 mm (0.0035 in.) If the thrust clearance is greater than the maximum, replace the balanceshaft housing and bearings. If necessary, replace the balanceshaft.

2. INSPECT BALANCESHAFT OIL CLEARANCE

(a) Clean each bearing and journal.

(b) Check each bearing and journal for pitting and scratches.

If a bearing or journal is damaged, replace the bearings. If necessary, replace the balanceshaft.

(c) Place the No. 1 and No. 2 balanceshafts onto the crankcase.

Lay a strip of Plastigage across each journal. Install the balanceshaft housing (See page EM-149). NOTICE:

Do not turn the balanceshafts.

Remove the balanceshafts (See page EM-127).

(g) Measure the Plastigage at its widest point. Standard oil clearance:

0.004 to 0.049 mm (0.0002 to 0.0019 in.) Maximum oil clearance: 0.049 mm (0.0019 in.) NOTICE:

Remove the Plastigage completely after the measurement.

If the oil clearance is greater than the maximum, replace the bearing. If necessary, replace the balanceshaft.

(h) If replacing a bearing, select a new one with the same number.

Standard balanceshaft housing journal bore diameter

Item

Specified Condition

Mark 1

26.000 to 26.006 mm (1.0236 to 1.0239 in.)

Mark 2

26.007 to 26.012 mm (1.0239 to 1.0241 in.)

Mark 3

26.013 to 26.018 mm (1.0241 to 1.0243 in.)

Standard bearing center wall thickness

Item

Specified Condition

Mark 1

1.486 to 1.489 mm (0.05850 to 0.05862 in.)

Mark 2

1.490 to 1.492 mm (0.05866 to 0.05874 in.)

Mark 3

1.493 to 1.495 mm (0.0588 to 0.0589 in.)

Standard balanceshaft journal diameter

Item

Journal diameter

Mark 1

22.985 to 23.000 mm (0.9049 to 0.9055 in.)

Mark 2

22.985 to 23.000 mm (0.9049 to 0.9055 in.)

Mark 3

22.985 to 23.000 mm (0.9049 to 0.9055 in.)

l n

r

Length

A131575E01

(i) Inspect the balanceshaft housing bolts.

(1) Using vernier calipers, measure the length of the bolts from the seat to the end. Standard bolt length:

58.3 to 59.7 mm (2.295 to 2.350 in.) Maximum bolt length:

60.3 mm (2.374 in.) If the bolt length is greater than the maximum, replace the balanceshaft housing bolt.

Measuring Area

Measuring Area

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Measuring Area

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12 3 4 5 6

A135727E01

3. INSPECT CHAIN SUB-ASSEMBLY

(a) Pull the chain with a force of 140 N (14.3 kgf, 31.5 lbf) as shown in the illustration.

(b) Using vernier calipers, measure the length of 15 links.

Maximum chain elongation:

Perform the measurement at 3 random places. Use the average of the measurements.

If the elongation is greater than the maximum, replace the chain.

4. INSPECT NO. 2 CHAIN SUB-ASSEMBLY

(a) Pull the chain with a force of 140 N (14.3 kgf, 31.5 lbf) as shown in the illustration.

(b) Using vernier calipers, measure the length of 15 links.

Maximum chain elongation:

Perform the measurement at 3 random places. Use the average of the measurements.

If the elongation is greater than the maximum, replace the No. 2 chain.

5. INSPECT OIL PUMP DRIVE GEAR

(a) Wrap the chain around the sprocket.

(b) Using vernier calipers, measure the sprocket diameter with the chain wrapped around. Minimum gear diameter (with chain):

The vernier calipers must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain and sprocket.

6. INSPECT OIL PUMP DRIVE SHAFT GEAR

(a) Wrap the chain around the sprocket.

(b) Using vernier calipers, measure the sprocket diameter with the chain wrapped around. Minimum gear diameter (with chain):

The vernier calipers must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain and sprocket.

7. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

(a) Wrap the chain around the sprocket.

(b) Using vernier calipers, measure the sprocket diameter with the chain wrapped around. Minimum gear diameter (with chain):

The vernier calipers must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain and sprocket.

8. INSPECT CAMSHAFT TIMING SPROCKET

(a) Wrap the chain around the sprocket.

(b) Using vernier calipers, measure the sprocket diameter with the chain wrapped around. Minimum gear diameter (with chain):

The vernier calipers must be in contact with the chain rollers when measuring.

If the diameter is less than the minimum, replace the chain and sprocket.

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A053035E01

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