Running in?

[jimh]

anybody know if a new diesel engine requires running in ? My previous boat's outboard needed 20 hours at progressive rev's (never full throttle) didn't know if the same applied for inboard's, afer all car's don't.??

TIA

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[dignity]

I've recently installed a Daewoo marine diesel, the manual basically advised no more than 2/3rds throttle for first 20 hours, but also keep varying your revs, after that use has normal, then after 50hrs an oil change. But having said that the engine is a commercial unit, I dare say each engine will have it's own requirement. If in doubt check with supplier.

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[charles_reed]

I'd not exceed 2/3rds of revs for the first 40 hours, then tighten down the cylinder head studs (using a torque wrench) and change the oil and filter.

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[tr7v8]

Be careful with this, most modern head gaskets shouldn't be retightened. So unless this is specifically requested as part of the first service it shouldn't be done.
Keeping the revs varied as well as not over revving also helps the rings bed in, so you shouldn't run at a continuos throttle setting for hours on end.

<hr width=100% size=1>Jim

Draco 2500

 

[oldsaltoz]

G'day Jim,

At a Terrotechnology (Oils aint oils) course I attended, they advised that a bog standard oil is best for new (and reconditioned) engines for the first 20 or so hrs, this allows proper bedding in.

Some oil additives coat high spots and deposit in lows, this leads to uneven wear. Might be worth following up.

Avagoodweekend Old Salt Oz /forums/images/icons/cool.gif

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[vyv_cox]

Correct and valuable advice. The running-in period is one of controlled wear, intended to take off high-points remaining from machining. Top tier oils, and some additives, contain substances that are designed to prevent wear by coating the hottest points with sulphide or phosphide films. So these additives function in a way contrary to requirements. The most effective way to run in is to use a fairly simple oil and, as others have said, no more than about 2/3 power and no extended periods of tick-over.

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[Plum]

good advice from tr7v8 regarding head gasket (nm)

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