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post #11 of 25 Old 04-04-2016
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Re: old engine, new engine

What kind of engine is it?

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post #12 of 25 Old 04-04-2016 Thread Starter
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Re: old engine, new engine

Its a Bukh 10 HP, currently 40 years old. Seems to be in good condition, starts fairly well, but I need to be sure I can depend on it more or less. So these discussions are very helpful for me as it guides me into what to look into that of course at this point I am overlooking and additional things to try and do.

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post #13 of 25 Old 04-04-2016
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Re: old engine, new engine

Is is raw water or fresh water cooled?

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post #14 of 25 Old 04-04-2016 Thread Starter
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Re: old engine, new engine

When you say raw water I presume you mean the engine is seawater cooled and not through a closed system?

Then yes, it is raw water cooled, when the engine is on I am constantly checking that the water is circulating and it does.
The overheating was not just my imagination because after like 30 min of motoring there is a red light coming up indicating that and a beeping sound too, like an alarm.
Once more, I am not a mechanic, so trying to figure it out and I could be wrong of course of a lot of things about it.

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post #15 of 25 Old 04-04-2016
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Re: old engine, new engine

Red light, beeping alarm, rpm to high.

Check the oil, and compression test the cylinders. Oil may be passing through defective rings and combusting producing higher rpm than would be produced at the throttle setting.
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post #16 of 25 Old 04-04-2016
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Re: old engine, new engine

A raw water system cools the engine directly with sea water.

A fresh water system still uses sea water, but there is a separate fresh water system circulating through the engine, and a heat exchanger between the two. The obvious advantage is that you are not circulating corrosive sea water through the engine block. If you've seen the inside of a 10-year-old heat exchanger, you'd see why that's not good for the engine internals.

A 40 year old fresh water engine has a chance of still having some life left, a raw water one is probably done due to extensive internal corrosion of the cooling passageways.

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post #17 of 25 Old 04-04-2016 Thread Starter
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Re: old engine, new engine

Ok, I guess I should book a diesel engine course as well.

I didnt know you can have both cooling systems at the same time. I will check about the separate fresh water system too.
Thank you!

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post #18 of 25 Old 04-04-2016
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Re: old engine, new engine

InThe small RWC Buhks are tough little engines. Is the boat in salt water? Has it always been? If so it may well have corrosion issues relating to overheating but check the simple things like the impeller and exhaust elbow first.

A friend spent $3500 on a new head to replace a corroded one on the same engine years back. That's a good down payment on a new engine if that's where you end up.

That engine is a bit anemic and may partly explain your perceived difficulty stopping.

Ron

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post #19 of 25 Old 04-05-2016
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Re: old engine, new engine

Well, I sailed a Catalina 27 with 11hp engine, and I don't mind telling you, it didn't stop on a sixpense, and stopping took a lot of revving. Small engine, small prop equals high rpm.

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post #20 of 25 Old 04-05-2016 Thread Starter
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Re: old engine, new engine

@Faster
The boat was with the first owner in Holland for majority of its life on sea water, then the next owner, an Austrian got the boat to Austria on the Danube, then came down to the Black Sea along the Danube (sweet water), then the boat was on the marina right on the Black Sea, and me third owner, I moved it less than half a mile inland on a lake (sweet water) that overflows into the Black Sea.
There is a good point about the costs of possible repairs and new parts, if that costs even half of what a new engine would be, I might as well go for a new engine. Truth be told, this boat really deserves a new chance to some glory days, like reviving her in every way I can. Hull intact, no mold nor rust anywhere on her inside or outside, perfect rigging. And because the Austrian owner was planning a long Med sailing she is fully equipped with a lot of things for long time/distance cruising, and with spare parts of pretty much everything, so plenty of things for me to learn about and practice. She just needs a really good cleaning and refurbishing all her wood, and removing a heater thats linked directly to the diesel tank, that one for some reason freaks me out. And oh yes, the chain of her anchor sits on a box tied down to the bow, weird, I need to rethink that.

I am getting the boat ready now to move aboard for the summer, and for me that means sailing that boat a lot and not just for leisure (ie, only when the weather is good), which means often taking her in and out of her slip. So the engine worries me. But a good mechanic is coming soon and I will know more, you gave me a good overview on what to look for.

@Mark
Working with a lazy engine must be a learning curve in itself, that must have gotten you quite experienced to maneouvre your boat.

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