Installation manual
DIESEL 
FUEL, 
ENGINE 
OIL 
AND 
ENGINE 
COOLANT 
DIESEL 
FUEL 
Use fuel that meets the requirements 
or 
specification 
of 
Class 2-D (ASTM), and has a cetane rating 
of 
#45 
or 
better.  . 
Care 
Of 
The 
Fuel 
Supply 
Use only clean diesel fuel! The clearance 
of 
the compo-
nents in your fuel injection pump is very critical; invisi-
ble dirt particles which might pass through the filter can 
damage these finely finished parts. 
It 
is important to buy 
clean fuel, and keep it clean. The best fuel can 
be 
ren-
dered unsatisfactory by careless handling 
or 
improper 
storage facilities. 
To 
assure that the fuel going into the 
tank for your engine's daily use is clean and pure, the 
following practice is advisable: 
Purchase a well-known brand 
of 
fuel. 
Install and regularly service a good, visual-type filterl 
water separator between the fuel tank and the engine. 
Raycor 500 
FG 
or 
900 FG is a good example 
of 
such 
a filter. 
ENGINE 
OIL 
Use a heavy duty engine oil  with an  API classification 
of 
CF or CG4 or better. Change the engine oil after an 
initial 50 hours 
of 
break-in operation, and every 200 hours 
of 
operation thereafter.  For recommended oil viscosity, 
see  the  following  chart: 
Operating 
Temperature 
Oil 
Viscosity 
Above 
68°F 
(20°C) 
SAE 
30 
or 
10W-30 
41°-68°F 
5-20°C) 
SAE 
20 
or 
10W-30 
Below 
41°F 
(5°C) 
SAE 
10W-30 
A 
CAUTION: 
00 
not 
allow 
two 
or 
more 
brands 
of 
engine 
oil 
to 
mix. 
Each 
brand 
contains 
its 
own 
additives; 
additives 
of 
different 
brands 
could 
react 
in 
the 
mixture 
to 
produce 
properties 
harmful 
to 
your 
engine. 
6 
ENGINE 
COOLANT 
The use 
of 
an antifreeze mixture 
of 
50/50 is recom-
mended for year-round use. Use antifreeze that is com-
patible with aluminium components, and never mix 
different brands 
of 
antifreeze. Do not use straight water, 
this can 
be 
detrimental to the cooling system compo-
nents. 
NOTE: 
Lookfor 
the new environmentally-friendly long 
lasting antifreeze that is now available. 
Antifreeze mixtures will protect against an unexpected 
freeze and they are beneficial to the engine's cooling 
system. They retard rust and add to the life 
of 
the circu-
lating pump seal. 
ANTIFREEZE 
PROTECTION 
Antifreeze 
concentration 
23% 
35% 
50% 
60% 
Freezing 
Temperature 
14°F 
-4°F 
-40°F 
-58°F 
(-5°C) 
(-20°C) 
(-40°C) 
(-50°C) 
COOLANT 
RECOVERY 
TANK 
A coolant recovery tank kit is supplied with each 
WESTERBEKE diesel engine. The purpose 
of 
this re-
covery tank is to allow for engine coolant expansion 
and contraction during engine operation, without the loss 
of 
coolant and without introducing air into the cooling 
system. 
COOLANT 
RECOVERY 
TANK 










