Petter mini twin 12HP engine

It's not just how well the engine has been maintained (important though that is), but with an older engine the robustness of the particular design and the availability of the spares count for a lot.

I was put off buying a boat some years ago by it having a Petter, having searched the forums and found various adverse comment on them in those terms, and little or none in their favour. (That's not to say there might be some out there still running fine.) I saw the same boat advertised a few years later with a replacement engine, suggesting the purchaser found the Petter unsatisfactory.

When recently considering buying another older boat, where the cost of replacing or rebuilding the engine (a reputable brand with most spares readily available) was a nigh on the value of the boat, I did consider getting a formal engineer's report on the condition of the motor before committing myself. I came to the view, though, that it would be quite expensive to do so, and that all the written advice in the report would be so hedged with qualification it wouldn't give me commensurate assurance.

Having satisfied myself that the engine appeared well looked after to my amateur eyes, I paid a local engineer (recommended by a friend in the boat trade), to come and run it (ashore) and give me his verbal comments on it. He was able to bring to bear his far greater experience and familiarity with the particular model.

He spotted that the exhaust manifold and alternator had been changed at some point, said he thought the model was a good one but pointed out a potential weakness of which I was unaware even after trawling the net, and said the engine seemed good for its age as far as he was able to tell without running it under load or dismantling parts. This gave me sufficient confidence to proceed with the purchase. Only time will tell whether the engine is as good as it seems, and the risk is all mine, but for the modest sum it cost me I am very glad I took this route and would do so again.
 
Thanks for the input LittleSister, it certainly makes sense to do as much research as you can especially were original or old engines are concerned regarding condition, replacement and spares etc.
 
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I agree Sailorman, but as this will be my first sailing yacht I was looking for something I could build experience from but would be more forgiving during my learning curve. Maybe I'm being over cautious.
 
Carl,
You might consider another boat type to better meet your needs. Over 2,500 26 foot Westerly Centaurs were made. The advantage of this small yacht is that there is a vast selection to choose from, many of which have been re-engined in the last few years. Also bilge keels so the harbours near you would be less of a problem. You can buy a decent one for about the all up cost of replacing the engine. Ignore asking prices when making your offer in the £4-6k range.
The downside, not at all fast !

Andrew
 
Thanks Andrew, I've looked at the Centaurs and they do seem a popular bilge keel. I don't mind a slower boat for this year to build up experience and confidence then move up to a faster one next year.
 
Carl,
Just bear in mind that boats are easy to buy and difficult to sell ! you are bound to lose money every time you change boats, not just in terms of depreciation and teh costs associated with changing, but all the inevitable trips to the chandlery or online to replace/ improve things. You need to decide if you want a comfortable small cruising boat Westerly Centuar, Merlin, Konsort ( the extra three feet make a lot of difference) or a Sunday racer, which will be less comfortable for longer trips ( less space for one thing)

Regards
 
Is it direct seawater cooled or a heat exchanger?...makes a difference as one has salty seawater running through the block..better is a heat exchanger engine should last longer.
 
I have had a petter mini twin in my boat for fifteen years. it has had for most of that time a heat exchanger fitted ,that is up until last year when it overheated on high revs , I just slowed the revs and all was well for the rest of that passage. on arrival at destination (Conway) investigation howed up poor pressure from my jabsco pump and it wasn't pumping enough water through the heat exchanger to cool the engine water. I removed the heat exchanger and ran it with raw water cooling which worked ok as the water did not have to pump so high and kept the engine cool enough for my return journey. I have no rebuilt the jabsco pump refaced the cover plate .a new back plate .new impellor . and new cam. and will be refitting the heat exchanger this year. I have made a lot of trips in my boat to the Isle of man Conway and Menai often having to motor all off the way on one leg or the other and would happily set off again tomorrow with my Petter to any of my usual haunts. Not all petters are bad nor all Volvos good. Kieron
 
Thanks to everyone who shared their knowledge with me. I appreciate the time spent. It's certainly gave me a lot to consider.
 
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