Join Date: Apr 2006
Location: Big Horse Creek, NC - Summer
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Running Diesel To Charge Batts = Bad
After this topic was discussed in another thread, I asked the Mack Boring (Yanmar Distributor) the question: why is running a diesel at anchor to charge batteries bad for the engine?
Dear Mr. Leslie,
Prolonged operation of an engine in an "unloaded" condition, such as
when using the engine's alternator to charge the batteries, can result
is a condition known as "glazed" cylinders in the engine. In an
"unloaded" engine, there is very little pressure on the engine's piston
rings which can cause them slide lightly over the surface of the
cylinder walls rather than being pressed firmly against the cylinder
walls. This can "polish" the cylinder walls resulting in low
compression, high oil consumption and excessive smoking. This is
particularly true with engines still in the break-in period.
If necessary to run the engine to charge the batteries at anchor or in
slip, run the engine in-gear and at not less than 1200-1500 rpm to
assure there is a suitable load on the engine.
We hope this information will be helpful to you.
Service and Parts Coordinator
Mack Boring & Parts Company