Inspection Of Camshaft

1. MEASURE CAMSHAFT THRUST CLEARANCE

Using a dial gauge, measure the camshaft thrust clearance.

(0.0020 - 0.0098 in.} Maximum clearance: 0.30 mm (0.0118 in.)

If clearance is greater than maximum, replace the camshaft and/or camshaft housing.

2. REMOVE CAMSHAFTS FROM CAMSHAFT HOUSINGS

(aI Remove camshaft housing rear covers by loosening the bolts.

(b) While turning the camshaft, slowly pull it out so as not to damage the camshaft housing.

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3. INSPECT CAMSHAFTS AND CAMSHAFT HOUSINGS

(a) Using a micrometer, measure the cam lobes. Standard lobe height

Intake 35.660 - 35.670 mm (1.4039 - 1.4043 in.) Exhaust 35.662 - 35.672 mm (1.4040 - 1.4044 in.) Minimum lobe height Intake 35.465 mm (1.3963 in.) Exhaust 35.467 mm (1.3963 in.)

If the lobe height is less than the minimum allowable, the camshaft is worn and must be replaced.

(b) Place the camshaft on V-blocks and measure the runout at the center journal.

Maximum circle runout: 0.04 mm (0.0016 In.)

If the runout is greater than maximum allowable, replace the camshaft.

(c) Using a micrometer, measure the journal diameter.

Standard

journal tfameter:

No.

1

37.959

37.975 mm

(1.4944 -

1.4951 in.I

No.

2

42.959

42.975 mm

(1.6913 -

1.6919 in.)

No.

3

43.459

43.475 mm

(1.7110 -

1.7116 In.)

No.

4

43.959

43.975 mm

(1.7307 -

1.7313 In.)

No.

5

44.459

44.475 mm

(1.7504 -

1.7510 In.)

No.

6

44.959

44.975 mm

(1.7700 -

1.7707 In.)

No.

7

45.459

45.475 mm

(1.7897 -

1.7904 In.)

(d) Using an inside micrometer, measure the housing bore.

(e) Subtract the journal diameter measurement from the housing bore measurement.

Standard clearance: 0.025 — 0.066 mm

(0.0010 - 0.0026 In.) Maximum clearance: 0.1 mm (0.004 in.)

If the clearance is greater than maximum, replace the camshaft and if necessary, the housing.

Mk2 Celica Supra Type

INSPECT CAMSHAFT HOUSINGS FOR FLATNESS

Using a precision straight edge and feeler gauge, check the surfaces contacting the cylinder head for warpage.

Maximum cylinder head surface warpage:

If warpage is greater than maximum, replace the housing.

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