Table of Contents
Advertisement
Adjustment of Valve Clearances
CAUTION
TIghten the cylinder head
bolts
to the specified torque before making valve adjustnients.
Adjust the valve clearances when the engine is cold.
1. Pull off the air breather
pipe
from
the
rocker cover, and
take off the rocker cover
bolts.
Adjust
the
valve clearan-
ces
at
TOC (Top Dead Center) for each cylinder when
they are on their compression stroke.
2. Adjust all valve clearances attheTop Dead Center
(TDC)
of the compression stroke for each cylinder. Take care
to align
the
TOC timing mark on
the
crankshaft pulley ex-
actly with
the
indicator mark on
the
gear case, as shown
on
the
Dlustration
below.
If these marks are not exactly
aligned,
the
valves may be
pushed
up by
the
piston,
depending on the position of
the
cam lobe.
3. Confirm that
the
valves do no move up or down when the
crankshaft is
turned
slightly in either direction
from
the
TOCmark.
4. Align
the
mark (as shown) for TOC for the No. 1 cylinder
on its compression stroke and adjust
the
valve clearan-
ces for both Intake and exhaust valves for
the
No. 1
cylinder with the engine cold.
5. When setting TOC for the No.2 cylinder (or the No.3
cylinder for the 30B THREE), proceed as follows:
A.
For the lOB TWO engine (2 cylinder)
from
TOe
for the
No .. 1 cylinder, rotate the crankshaft 180 ° clockwise
(as viewed from the front
of
the engine) and adjust the
valve clearances for both intake and exhaust valves for
the No.2 cylinder.
B. For the 30B THREE engine (3 cylinder) from TOC for
the No. 1 cylinder, rotate
the
crankshaft 240° clockwise
(as viewed from
the
front
of
the engine) to position the
No. 3 cylinder at TOC. Adjust the valve clearances for
both intake and exhaust valves for the No.3 cylinder.
Intake 0.010 inches (0.25 mm)
Exhaust 0.010 inches (0.25 mm)
ADJUST VALVES TO 0.010 IICHES
(1.25 MMl
Milk
on
_case
Rotate the crankshaft an additional 240° clockwise to position the No.2 cylinder at TDC. Adjust the
valve clearances for both intake and exhaust valves for the No.2 cylinder.
-..yo
WESTERBEKE
Engines & Generators
53
Advertisement
Table of Contents
