1D
Camshaft and Tappet Inspection
Reference: Camshaft and Tappet Removal and Installation:K9K
Camshaft
• Check teeth of sprocket for wear or damage.
• Check journals and cam faces for wear or damage.
If any malcondition is found, replace camshaft.
• Using a micrometer, measure cam height “a”.
If measured height is out of specification, replace camshaft.
Cam height “a”
In: 43.985 – 44.045 mm (1.73170 – 1.73405 in.)
Ex: 44.565 – 44.625 mm (1.75453 – 1.75688 in.)
Camshaft Journal Wear
• Check camshaft journals and camshaft housings for pitting, scratches, wear or damage.
If any malcondition is found, replace camshaft or cylinder head with housing. Never replace cylinder head without replacing housings.
• Check clearance between camshaft and camshaft journal using gauging plastic as follows.
NOTE:
Do not rotate camshaft while gauging plastic is installed.
a. Clean housings and camshaft journals.
b. Remove all tappets.
c. Install camshaft to cylinder head.
d. Place a piece of gauging plastic to full width of journal of camshaft (parallel to camshaft).
e. Install camshaft housing to cylinder head as follows.
i. Fit camshaft housing to cylinder head.
ii. Tighten camshaft housing bolts temporarily by hand.
iii. Tighten camshaft housing bolts in numerical order as indicated in the figure a little at a time till they are tightened to specified torque.
Tightening torque
Camshaft housing bolt ( a ): Tighten 10 N·m (1.0 kgf-m, 7.5 lbf-ft) by the specified procedure
f. Remove housing, and using scale (2) on gauging plastic (1) envelop, measure gauging plastic width at its widest point.
Camshaft journal clearance:
0.049 – 0.171 mm (0.00193 – 0.00673 in.)
g. If measured camshaft journal clearance exceeds limit, measure journal (housing) bore and outside diameter of camshaft journal. Replace camshaft or cylinder head assembly whichever the difference from specification is greater.
Camshaft journal outside diameter [A]
No.6: 27.979 – 27.999 mm (1.10154 – 1.10232 in.)
Other: 24.979 – 24.999 mm (0.9835 – 0.98421 in.)
Camshaft journal bore diameter [B]
No.6: 28.040 – 28.060 mm (1.10394 – 1.10472 in.)
Other: 25.040 – 25.060 mm (0.98583 – 0.98661 in.)
Camshaft Thrust Play
1) Clean housings and camshaft journals.
2) Remove all tappets.
3) Remove all valves referring to Valves and Cylinder Head Assembly Removal and Installation:K9K .
4) Install camshaft to cylinder head.
5) Install camshaft housing to cylinder head as follows.
a) Fit camshaft housing to cylinder head.
b) Tighten camshaft housing bolts temporarily by hand.
c) Tighten camshaft housing bolts in numerical order as indicated in the figure a little at a time till they are tightened to specified torque.
Tightening torque
Camshaft housing bolt ( a ): Tighten 10 N·m (1.0 kgf-m, 7.5 lbf-ft) by the specified procedure
6) Measure camshaft thrust play using special tool, dial gauge (1) and magnetic stand (2) as shown in the figure.
If measured thrust play out of its specification, replace camshaft or cylinder head.
Special Tool
(A) : 09917–68110
Camshaft thrust play:
0.080 – 0.178 mm (0.00315 – 0.00700 in.)
Wear of Tappet
• Check tappet for pitting, scratches or damage.
If any malcondition is found, replace.
• Measure cylinder head bore and tappet outside diameter to determine cylinder head-to-tappet clearance. If clearance exceeds specification, replace tappet or cylinder head.
Cylinder head to tappet clearance:
0.015 – 0.075 mm (0.00059 – 0.00295 in.)
Tappet outside diameter [A]:
34.965 – 34.985 mm (1.37658 – 1.37736 in.)
Cylinder head tappet bore [B]:
35.000 – 35.040 mm (1.37796 – 1.37952 in.)