Valve Clearance Adjustment - Westerbeke 55B-FOUR Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
The following engine adjustments sTwuld be peiformed by a
competent engine mecTwnic. The information below is provided to
assist the mechanic.
VALVE CLEARANCE ADJUSTMENT
The valve clearance must be adjusted every 500 operating
hours or whenever the valve rocker is abnormally noisy.
Valve adjustment should only be done when engine is cold.
. Cold engine valve clearance is 0.015in (0.40mm).
VALVE CLEARANCE
NOTE: The
Cylinder heGd bolts have been tightened with the '
"Angular TIghtening MetTwd". Therefore, it is not necessary
to retighten the cylinder head bolts before adjusting the valve '
clearances.
ADJUSTMENT PROCEDURE
f
CRANK
PULLEY
.
- -
- ' ;
~
- " . " \
1. Tum the crankshaft clockwise so that the mark groove on '
the crank pulley is aligned with the TDC mark (cast out)
on the timing gear case cover.
i
2. Remove the cylinder head cover and check to see if cylin-
der No.1
is
at IDC in the compression stroke or at IDC
in the exhaust stroke. When the intake imd exhaust valves
are closed, the cylinder is at IDC in the compression
stroke, and when only the exhaust valve is open, it is at
IDC in the exhaust stroke.
CYLINDER NO.1
COMPRESSION·
- 7\ .
~l-J--
.
G . . .
_~
....._"'57\ ;
CYLINDER NO.1,
r ---' \ ",,--,
EXHAUST ,
3. In accordance with tlJe ccmditions of cylinder No.1, mea-
sure and adjust if required the clearance of the valves
marked with either@ or. in the table below.
Cylinder No. 1 2
3 4
Valve ,arra.ngemant
I E I E I
E
I
E
When No.1 cylinder is at TDC
• • •
•
' in the compression stroke
When No.4 cylinder is at TOC
in the cotnpression stroke
I1il © © ©
I: Inlet E .. Exhaust
4. On completion of the valve clearance alignment make a
mark alignment as in 1 by giving a
turn
to the crankshaft
in the normal direction. Then measure and adjust the
clearance of the other valves.
A
CAUTION:
The rocker arm is made
of
die-cast
aluminum. Therefore, be careful not
to
tighten the
adjusting screw to excess.
Adjustment of Injection Timing
The injection timing may not be re-adjusted. Take care not to
forget to insert a shim in the mounting surface when
reassembling the injection pump after disassembly.
IDLE SPEED
(OPERATING RPMS)
Engine idles speed
950 - 1000 rpm
(All models in this manual)
Idle speed should be adjusted with the engine in its normal
operating temperature range.
Cruise RPM
Models 55BIFour and 55CIFour
Model 55DIFour
2000-2500 rpm
2000-2400 rpm
Maximnm RPM (propeller loaded)
Models 55BIFour and 55C/Four 2950-3000 rpm
Model 55DIFour 2550-2600 rpm
~ WESTERBEKE
Engines & Genera/ors
37