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Homebrewer -> Engine Break In (1/18/2003 5:40:16 AM)
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Page 8 of the OS 1.60 Owners Manual states;
"Lubricants may be either castor oil or a suitable synthetic oil (or a blend of both) provided they are always of top quality"
Page 10 of the OS 1.60 Owner's Manual states the following procedure to break-in your engine:
RUNNING-IN ("Breaking-in")
All internal-combustion engines benefit from extra care when
they are run for the first few times - known as running-in or
breaking-in. This is because the working parts of a new engine
take some time to settle down after being subjected to high
temperatures and stresses. Therefore, it is vitally important to
complete the break-in before allowing the engine to run
continuously at high speed and before finalizing carburettor
adjustments. However, because O.S. engines are produced
with the aid of the finest modern precision machinery and
from the best and most suitable materials, only a short and
simple running-in procedure is called for and can be carried
out with the engine installed in the model.
The process is as follows.
Install the proper propeller intended for your model. Open
the needle-valve 2-2 to turns from the fully closed position
and start the engine. Run the engine for two to three
minutes with the throttle fully open, but with the needlevalve
adjusted for rich, slow "four-cycle"operation.
Now close the needle-valve until the engine speeds up to
"two-cycle"operation and allow it to run for about 10
seconds, then reopen the needle-valve to bring the engine
back to "four-cycle"operation and run it for another 10
seconds. Repeat this procedure until the fuel tank is empty.
Refer to IDLING ADJUSTMENT section and fix the idling
position where the lowest possible r.p.m., with steady
running, is obtained.
Re-start and adjust the needle-valve so that the engine just
breaks into "two-cycle" from "four-cycle" operation, then
make three or four flights, avoiding successive "nose-up"
flights.
During subsequent flights, the needle-valve can be
gradually closed to give more power.
However, if the engine shows signs of running too lean, the
next flight should be set richer. After a total of ten to fifteen
flights, the engine should run continuously, at its optimum
needle-valve setting, without loss of power.
Coolpower is 17% oil and was for many years recommended by name in OS's owner's manual. However, OS owner's manual now recommend a fuel containing 18% oil. If you wish, 2-3 ounces of castor or synthetic oil wouldn't hurt one bit. I don't think using Coolpower without adding oil would be harmful at all as long as you don't run the engine too lean. Larger engines actually don't need as much oil % in their fuel as smaller engines do.
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