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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 05-11-2012
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Used Motor for a "New" Repower?

Hi all,

I have an offer accepted on an older (1979) CSY 44 with a Perkins 4-154. Great motor I'm told, and it will be checked with a mechanical survey. However, the possibility of having to repower at some point does exist.

While cruising the net I came across a site like boat trader, but for diesel engines, Diesel Engine TRader. It has a lot of used, reconditioned, and rebuilt motors of all sizes and uses. Most of these come with 1-2 year guarantees.

So instead of forking out $20k+ on a repower, a motor could be had for $6-8K, bring the repower cost to a managable level. It seems that a new motor would never be used enought to recoup some of your investment.

Thoughts?

Cheers, Bill
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Old 05-11-2012
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Re: Used Motor for a "New" Repower?

We just had to do a repower. We considered getting a rebuilt engine but after getting nickel and dimed with the original engine, we didn't want to take the chance that rebuilt wasn't going to be any better after the first year or so.
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Old 05-11-2012
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Re: Used Motor for a "New" Repower?

Re-built?, to what extent? by whom?, on and on. Pretty hard to tell by just looking. Oil analysis, compression test, and an engine "survey" could help but until it is put in the boat and run hard for a long period of time, no way to know for sure what the real condition may be. One or Two year warantee? What does it cover, probably just parts and not labor for a remove and replace? Probably the "average" boater doesn't put a whole lot of time on the engine in that time frame. Overall, if you have a problem a new engine may not be all that much more costly. Unless you know the history of the engine first hand I guess you would just have to ask yourself "Do I feel lucky"?

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Re: Used Motor for a "New" Repower?

Mont :

The motor you have may well be OK. You may not have to repower. It might be OK.
Time will tell if it is using oil.
I trust it is easy to start when stone cold and doesn't smoke much?
Both are very good signs for an unknown motor.
Take the boat out on the water and work the motor hard. See how it performs.

Watch carefully for every vital sign.
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Re: Used Motor for a "New" Repower?

Quote:
Originally Posted by Rockter View Post
Mont :

The motor you have may well be OK. You may not have to repower. It might be OK.
Time will tell if it is using oil.
I trust it is easy to start when stone cold and doesn't smoke much?
Both are very good signs for an unknown motor.
Take the boat out on the water and work the motor hard. See how it performs.

Watch carefully for every vital sign.
Good point, unless you can't get parts and if there is nothing "fatal" with the existing engine, you could just re-build it if necessary. That way you would know exactely what has been done. All this is assuming the existing engine is big enough.

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Old 05-13-2012
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Re: Used Motor for a "New" Repower?

Hi all,

Thanks for the replies. "Rebuilt by who?", indeed. Just the kind of opinions I was looking for. I do the survey and sea trial tomorrow, as well as the mechanical engine survey. We will ride the motor as hard as they will allow, and I will see how easy it starts from dead cold.

I'm also going to get an oil analysis, but due to the fact that it has been sitting, not sure what it can tell me. Anything I should be looking for as far as the oil, besides obvious color anomalies?

BTW, the motor is a Perkins 4-154, 62 hp I think, rebuilt in 1988. The boat weighs 37,000 lbs.

Thanks as always for the help.

Cheers, Bill
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Old 05-13-2012
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Re: Used Motor for a "New" Repower?

Even if the oil has been sitting, as long as it has some hours on it the oil analysis should show any abnormalities. My experience is that not too long after changing the oil turns black and has kind of an acrid smell to it. If it smells like diesel fuel, unburnt fuel, caused by bad injectors, may be washing down into the crankcase? Carefully removing the oil filler cap when running may show excessive crankcase blow-by pressure, but a compression test is the best measure to check rings and valves. If the engine is tired, rebuilding the existing engine, if possible, would be easier and less costly than changing to a different engine, assuming that it is big enough to get the job done.

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Old 05-13-2012
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Re: Used Motor for a "New" Repower?

Rebuilt can mean almost anything, and usually means the minimum was done to make it run. I would explore having the existing engine rebuilt at a reputable shop and replacing all the extras (starter, alternator(s), injection pump, raw and coolant pumps, etc. If this doesn't' make financial sense then go for new unless you can find a "remanufactured" Perkins.
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Old 05-14-2012
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Re: Used Motor for a "New" Repower?

Quote:
Originally Posted by montenido View Post
Hi all,

Thanks for the replies. "Rebuilt by who?", indeed. Just the kind of opinions I was looking for. I do the survey and sea trial tomorrow, as well as the mechanical engine survey. We will ride the motor as hard as they will allow, and I will see how easy it starts from dead cold.

I'm also going to get an oil analysis, but due to the fact that it has been sitting, not sure what it can tell me. Anything I should be looking for as far as the oil, besides obvious color anomalies?

BTW, the motor is a Perkins 4-154, 62 hp I think, rebuilt in 1988. The boat weighs 37,000 lbs.

Thanks as always for the help.

Cheers, Bill
Would be interested in what you find in the trial run?

Paul T
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Re: Used Motor for a "New" Repower?

FWIW, the PO of my boat re-powered with a "second hand" engine just before I bought it... and what a PITA that has been!!

My advice: If you can't afford new, by all means buy "used" (2nd-hand, refurbished, whatever) - but expect it to be a "used" engine and have all the normal maintenance issues that come with a used engine. At least that way, if they've done a good job re-building it, you won't be as disappointed as I was.
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