Gemini 105Mc Owner’s Manual
58
Copyright © 2004 Performance Cruising Inc.
Westerbeke Engine 30B Quick Notes
This addendum is intended as a FAQ (Frequently
Asked Questions) resource for new Gemini owner’s.
For complete instructions on maintenance and care
of your new Westerbeke 30B Diesel Engine, please
read the included manual thoroughly.
Breaking in Your Diesel Engine
Although current technology provides the means of
manufacturing engine parts with unimaginable preci-
sion, the manufacturer still falls far short of achieving
the near perfect fit that a proper break-in will pro-
vide. “Break-in,” for the most part, is the allowance
of the machined cylinder and ring surfaces to conform
to each other’s shape during engine operation. This
conforming or “mating” of ring and cylinder surfaces is
the ultimate goal of a proper break-in. “Mating” these
two specific parts will produce a very tight seal in
each cylinder. A tight seal is very important because it
prevents the escape of unburned fuel and pressurized
gasses into the crankcase, while further preventing
crankcase oil from entering the cylinder above the top
compression ring.
1. Start engine and run at fast idle, approximately
1500 RPM, and check the oil pressure. Run the engine
for 30 minutes even though coolant may rise to oper-
ating temperature in a few minutes. If the coolant
should "boil over," stop engine and allow to cool. Then
start again and proceed as above.
2. Start engine again and make a test run, on the wa-
ter at 1500 to 2000 rpm’s, and rapidly accelerate to
3500 and decelerate to 1500 rpm's 10 times. Applying
loads to the engine for short periods of time causes
increased ring pressure against the cylinder walls and
helps to seat the rings. This is especially important
because you are "breaking-in" the engine with heavy-
duty oils. The rapid deceleration increases vacuum and
gives extra lubrication to the piston and ring assem-
blies.
3. When you have accumulated 25 to 50 hours of op-
eration, change the engine oil and filter according to
manufacturer’s recommendations for oil type and fil-
ter number.
4. When required as per your manual, re-torque cylin-
der heads and manifolds to engine manufacturer's
specifications in proper sequence. Readjust tappets if
necessary. This job is typically performed by a quali-
fied mechanic.
Westerbeke Spare Parts Kit
Performance Cruising does resell the Westerbeke
Spare Parts Kit - (A) - please make checks payable to
Performance Cruising for a total of $170.00 The kit
includes:
x
Kit A Zinc (2)
x
Heat Exchanger Gasket
x
Fuel Elements (2)
x
Oil Filter
x
Belt
x
Fuel Hardware Kit
x
Impeller and Gasket Kit
Changing The Oil
Westerbeke recommends replacing the oil filter (Part
36918) with only the Westerbeke supplied oil filter.
There is little price difference between the Wester-
beke filter and off-the-shelf filters, but a major differ-
ence in the quality of the filter. For your engine’s
sake, use only the Westerbeke filter.
As for oil, the best choice is a heavy duty SAE 30 single
grade oil for our all around operating conditions in the
mid-Atlantic region. . The oil should be changed after
the initial 50 hour break-in period and every 100 hours
of operation or once a season which ever comes
first. Synthetics oils are acceptable, but should not be
used during the break-in period. Check your manual
for exact instruction on how to replace the oil.
Transmission Fluid
The Westerbeke transmission is filled with the same
SAE 30 single grade oil as used in the engine. There is
approximately 1 quart.
Fuel Filters
Your Westerbeke 30B comes installed with one exter-
nal fuel filter and an additional internal fuel filter.
Westerbeke recommends changing the filters annually
except if you have contaminated fuel, in which case
you will need several filters. The external filter is a
Racor Model 120AS. We recommend using a 30 micron
filter for replacement—part #R12P. Additional replace-
ment filters are part #R12S (2 micron) or R12T (10
micron).
CAUTION: IN THE EVENT OF ENGINE TROUBLE:
If you encounter engine trouble and cannot start the
engine, do not continue attempting to crank the en-
gine without taking a precaution. Prolonged cranking
