ENGINE
3-18
8. VALVE CLEARANCE
Valve clearances should be checked and adjusted
as follows while the engine is still cold.
<4M50>
[Inspection]
Remove the rocker cover.
Bring the No. 1 or No. 4 cylinder piston to the top
dead center (TDC) on the compression stroke by
the following procedure:
This will place either the No. 1 or No. 4 cylin-
der piston at TDC on the compression stroke.
The cylinder in which the rocker arms for
both the intake and exhaust valves can be
pushed down by hand by the valve clearance
amounts has its piston at TDC. Rotate the
engine by one full turn to switch the TDCs of
the No. 1 and No. 4 cylinder pistons.
With the No. 1 or No. 4 cylinder piston at TDC,
measure the clearance of the valves marked
with a circle in the table below.
The thickness gauge cannot be inserted under
the adjusting screw pad without carrying out the
above step, as the pad will block the thickness
gauge as shown in the illustration.
Adjusting intervals
Every 50,000 km (30,000 miles)
Cylinder No.1234
Valve INEXINEXINEXINEX
No. 1 cylinder
piston at TDC on
compression
stroke
OOO– –O – –
No. 4 cylinder
piston at TDC on
compression
stroke
–––OO–OO
P69238E
I
IV
"I, IV"
Pointer
P48701E
Valve clearance
Thickness
gauge
Pad
Thickness
gauge
P30149E
FUSO ASCENT-ALEJANDRO CANTO
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