0B–6 SERVICE INFORMATION
Cooling System
Fan Belt Inspection
Check the drive belt tension.
Depress the drive belt mid-portion with a 100 N (10kg/22
lb) force.
Drive Belt Deflection: 8 – 11 mm (0.31 – 0.43 in)
Check the drive belts for cracking and other damage.
Valve Clearance Adjustment
The following instructions assume that valve clearance is
adjusted beginning with the No. 1 piston at top dead
center (TDC) on the compression stroke.
Check the alignment timing mark between the timing
advancer and the mark line on the injection pump body.
If the timing marks are aligned, the No. 1 piston is at TDC
on the compression stroke.
Valve clearance must be adjusted when the engine is
cold.
When removing the head cover, wipe off spilled oil with a
rag.
1. Bring the piston in the No. 1 or No. 6 cylinder to the
top dead center on the compression stroke by turning
the crankshaft until the T.D.C. line on the damper is
aligned with the timing pointer on the front cover.
Check the rocker arm shaft bracket nuts for looseness
and retighten as necessary before adjusting the valve
clearance.
2. Check that the No. 1 intake and exhaust rocker arms
have play. If they have play, it indicates that the No. 1
piston is at TDC (Top Dead Center) on the
compression stroke. If the No. 1 exhaust valves are
depressed, the No. 6 piston is at TDC on the
compression stroke.
3. Adjust valve clearances for the No. 1 or No. 6 cylinder
which its piston is at TDC on compression stroke.
1. Loosen each adjusting screw on the bridge and
rocker arm.
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