Camshaft and Tappet Inspection
Camshaft and Tappet Inspection
Camshaft and Tappet Removal and Installation
Cam Height
Using a micrometer, measure cam height "a". If measured height is out of standard values, replace camshaft.
Cam Height (IN)
Standard: 47.023 - 47.183 mm (1.8513 - 1.8576 in.)
Limit: 46.890 mm (1.8461 in.)
Cam Height (EX)
Standard: 46.543 - 46.703 mm (1.8324 - 1.8387 in.)
Limit: 46.420 mm (1.8276 in.)
Camshaft Runout
Set camshaft between two "V" blocks and measure its runout using a dial gauge.
If measured camshaft runout exceeds limit, replace camshaft.
Camshaft runout limit
0.015 mm (0.00050 in.)
Camshaft Journal
- Check camshaft journals and camshaft housings for pitting, scratches, wear or damage.
If any defective is found, replace camshaft or cylinder head with camshaft housings.
Camshaft Journal Clearance
1) Clean camshaft housings and camshaft journals.
2) Remove all tappets.
3) Install camshafts and lower bearing half to cylinder head.
4) Place a piece of gauging plastic to full width of camshaft journal (parallel to camshaft).
5) Install camshaft housing referring to steps 5) to 6) in "Installation" under Camshaft and Tappet Removal and Installation Camshaft and Tappet Removal and Installation.
NOTE:
Do not rotate camshaft while gauging plastic is installed.
6) Remove housings, and using scale (2) on gauging plastic envelop, measure gauging plastic (1) width at its widest point.
Camshaft journal clearance (intake side of camshaft housing No.1)
Standard: 0.020 - 0.072 mm (0.00079 - 0.00283 in.)
Limit: 0.10 mm (0.0039 in.)
Camshaft journal clearance (except intake side of camshaft housing No.1)
Standard: 0.020 - 0.062 mm (0.00079 - 0.00244 in.)
Limit: 0.095 mm (0.00374 in.)
If measured camshaft journal clearance exceeds limit, recheck camshaft journal clearance according to the following procedure.
a) Install camshaft upper bearing half and camshaft housings without camshafts to cylinder head.
b) Tighten camshaft housing bolts referring to Step 6) in "Installation" under Camshaft and Tappet Removal and Installation Camshaft and Tappet Removal and Installation.
c) For intake camshaft journal No.1, measure journal outside diameter at positions shown in figure.
If measured diameter is out of standard values, replace camshaft and recheck camshaft journal clearance.
If measured diameter is within standard values, replace camshaft bearings and recheck camshaft journal clearance.
d) For all other camshaft journals, measure camshaft journal outside diameters and camshaft housing inside diameters.
If measured diameters are out of standard values, replace corresponding camshaft or cylinder head and camshaft housings.
Camshaft journal outside diameter
Camshaft housing inside diameter
7) Install intake and exhaust camshaft without tappet, and then measure intake and exhaust camshaft housing thrust clearance using a dial gauge.
If measured clearance exceeds limit, replace camshaft or cylinder head and camshaft housings.
Camshaft housing thrust clearance
Standard: 0.10 - 0.35 mm (0.0040 - 0.0137 in.)
Limit: 0.50 mm (0.020 in.)
Wear of Tappet
Check tappet for pitting, scratches, or damage.
If any defective condition is found, replace tappet.
Measure tappet bore of cylinder head inside diameter, and tappet outside diameter, and then determine cylinder head-to-tappet clearance. If clearance exceeds limit, replace tappet or cylinder head.
Cylinder head to tappet clearance
Standard: 0.025 - 0.066 mm (0.0010 - 0.0025 in.)
Limit: 0.10 mm (0.0039 in.)
Tappet outside diameter
Standard: 32.459 - 32.475 mm (1.2780 - 1.2785 in.)
Cylinder head tappet bore
Standard: 32.500 - 32.525 mm (1.2796 - 1.2805 in.)
Exhaust Camshaft Timing Sprocket
Check exhaust camshaft timing sprocket for wear and damage.
If any defective condition is found, replace exhaust camshaft timing sprocket.
CMP actuator
- Check CMP actuator for wear or damage.
If any defective condition is found, replace CMP actuator.
- Install CMP actuator to intake camshaft and hold hexagonal section of intake camshaft stationary using wrench or the like.
Check that CMP actuator (1) cannot be turned by hand.
If it can be turned by hand, replace CMP actuator.
