Westerbeke 5.0KW BCG-60Hz Service Manual page 64

ENGINE ADJUSTMENTS
TORQUING THE CYLINDER HEAD BOLTS
After the initial breal<-in period (approximately
50
hours), the
cylinder head bolts should be re-torqued.
Tighten the cylinde:r head bolts according to the sequence
shown. Make sure the engine is cold when this is done, and
loosen one head bolt one-half tum and then tighten it
between 43 - 51 Ib-ft (60 - 70 Nm). Then proceed to the next
head bolt in the sequence. Tighten the RS (rocker cover stud)
securely.
FRONTOF~
ENGINE ..........-...
6
IGNITION TIMING
4
2
1. Attach a timing light to the #1 spark plug and mark the
front timing pointer to indicate 15°. Locate the timing
mark on the crankshaft pulley and mark it with white
chalk or a crayon.
2. Start the engine and warm it up to its normal operating
temperature. Make sure the generator is operating without
a
loadoni(.
3. Using the timing light, align the timing mark in the front
crankshaft pulley so it is just slightly before the fIrst tim-
ing pointer. Do this by loosening and slowly rotating the
distributor body. Use the following timing specifIcations:
Timing Specifications: 15"
±
.5° BTDC at 1800 rpm
(no load on generator)
IGNITION TIMING
7
VALVE CLEARANCE ADJUSTMENT
NOTE:
Retorque the cylinder head bolts before adjusting the
engine's valves (see TORQUING THE CYliNDER HEAD
BOLTS).
1.
Remove the rocker cover and gasket.
2. Rotate the crankshaft in the normal direction of rotation,
placing the No.1 piston at the top of its compression
stroke with the exhaust and intake valves completely
closed. Adjust the intake and exhaust valves for No.1
cylinder, the exhaust valve for No.2 cylinder, and the
intake valve for NO.3 cylinder (see chart).
3. Rotate the crankshaft 180
0
in its normal direction of
rotation. Locate the piston in No.1 cylinder at the top of
its exhaust stroke. Adjust the intake valve for No.2
cylinder and the exhaust valve for No.3 cylinder (see
chart).
CYLINDER #
CRANK ANGLE
1 2 3
When No. 1 piston is set at top of IN
•
•
compression stroke
• •
EX
When No. 1 piston is positioned IN
•
at top of exhaust stroke
EX
•
4 .. Replace the rocker cover along with a new rocker cover
gasket..
Rocker cover torque: 2.9-5.1 Ib-ft (4 - 7 Nm)
VALVE
CLEARANCE
Valve Clearance: INTAKE .008 inches (O.20mm)
EXHAUST :012 inches (O.30mm)
Engines & Generators
56