Valve Clearance; Oil Pressure - Westerbeke BTG 8.5 Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends
that
the following engine adjust-
ments be performed
by
a competent engine mechanic. The information
below is provided to assist the mechanic.
VALVE CLEARANCE ADJUSTMENT
After the initial break-in period (approximately 50 hours),
the
valve clearances should be adjusted.
NOTE:
Retorque the cylinder head bolts before adjusting the
engines valves (see TORQUING THE CYUNDER HEAD
BOLTS).
1. Remove the rocker cover and gasket
2. Position the No.I piston at Top Dead Center
('IDC)
of its
compression stroke and adjust
the
#1 and #3 exhaust
valves. While facing the front of the engine, rotate the
crankshaft 360" clockwise and adjust the remaining
valves.
CLEARANCES: VALVE SIDE INTAKE 0.010 in (0.25mm)
EXHAUST .0012 in (0.30mm)
CAM SIDE INTAKE 0.007 in (0.18mm)
EXHAUST 0.009 in (0.23mm)
VALVE CLEARANCE
VALVE
CLEARANCE
3. Replace the rocker cover and rocker cover gasket.
ROCKER COVER TIGHTENING TORQUE: 2.6-4.0 Ft-lb (4.11-6.0 Kg-m)
CYLINDER HEAD
BOLTPAnERN
1
TORQUING THE CRINDER HEAD BOLTS
After the initial break-in period (approximately 50 hours), the
cylinder head bolts should be re-torques. ·
Loosen the cylinder head bolts one half
turn
in the order
shown. (The engine should be cold). Then tighten the bolts in
the sequence shown beiow. One bolt at a time. Tighten the
rocker cover stud securely.
8
6
CYLINDER HEAD BOLTS TIGHTENING TORQUE:
5&-59 Ft-lb (7.8-8.2 Kg-m)
OIL PRESSURE
The engine's oil pressure, during operation, is indicated
by the oil pressure gauge on
the
instrument panel. During
normal operation, the oil pressure will range between 40 and
· 60 psi (2.8 and 4.2 kglcm2).
NOTE: A
newly
started. cold engine can have an oil pressure
reading up
to
60 psi (4.2 kglcrrf). A warmed engine can have
an oil pressure reading as low as 35 psi (25 kg/em:). These
readings will vary depending upon the temperature of the
engine
and the
TP.l'M.· · ·
TESTING OIL PRESSURE
To test the oil pressure, remove the oil pressure sender, then
install a mechanical oil pressure gauge in it's place. After
warming up the engine, set the engine speed at 1800 rpm
and read the oil pressure gauge.
Oil Pressure 35.0 lblin'
(3.8 kg/em')
or more at
1800 rpm.
Sender and
Switch
Torgue
9 -13 ft-lb (1.2 ·1.8 m
·kg).
1-..IWESTERBEKE
· l
Engines & Generators
20