Yanmar still overheating - Page 4 - SailNet Community
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post #31 of 37 Old 08-22-2013 Thread Starter
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Re: Yanmar still overheating

Yes it is a plug but not for a potential dipstick !

How it popped off is quite a mystery and the consequences could have been really bad considering how much oil comes gushing out!
All my thanks to Niemiec marine . They did not know but made a few calls to Yanmar and came back with the answer.

Plug for a potential additional sensor The recommendation is simply to re insert, maybe with a tiny bit of caulk to make sure it does not come off

The good news is that I do not need to buy anything
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post #32 of 37 Old 08-22-2013
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Re: Yanmar still overheating

I would be concerned about WHY it popped out. Is it a cause, or a symptom? With a recent oil change, there's the possibility that it was over-filled. If it pops out again, you could have a bigger problem (piston rings, e.g.)

I doubt most caulks would do a good job of holding it in place, might be better off using safety wire.

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post #33 of 37 Old 08-22-2013 Thread Starter
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Re: Yanmar still overheating

Same concern Will just re insert with nothing additional to hold it And then keep an eye on it. I think that when engine overheated ...oil came very hot and maybe expanded ? Or just the heat created vapors inside engine ?
Yanmar says its does not mean anything bad ....unless it pops out again without the overheat... Engine run smooth and no smoke of ant color so ...sea trial next Saturday
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post #34 of 37 Old 08-24-2013
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Re: Yanmar still overheating

Frencha, could have been blow-by, in which case it will happen again, and you'll neet a ring job, at least. Hope it's not!

From pouring over the Yanmar engine parts drawings, it doesn't appear to have a crankcase vent, so, like you said, it could simply have been caused by the overheating, so you're back to that. Look forward to a report on your sea trial!

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post #35 of 37 Old 08-24-2013
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Re: Yanmar still overheating

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Originally Posted by Brewgyver View Post
Frencha, could have been blow-by, in which case it will happen again, and you'll neet a ring job, at least. Hope it's not!

From pouring over the Yanmar engine parts drawings, it doesn't appear to have a crankcase vent, so, like you said, it could simply have been caused by the overheating, so you're back to that. Look forward to a report on your sea trial!
all Internal combustion engines have a Crankcase vent. The vent on the Yanmar it is in the valve cover as it is on most engines

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Re: Yanmar still overheating

Oops, duh! on me!

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post #37 of 37 Old 08-26-2013 Thread Starter
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Re: Yanmar still overheating

So now I thanks ou all for your input I think I found what sent wrong and why I got engine overheating.
Not one major problem but couple of minor failures lead to overheating .
lt started with low water flow at exhaust. I thought that a first acid flush was enough and yes it did improve flow but a second flush has again improved the flow. I can see now that it is perfect simply has I connected pump to a bucket of fresh water and got a good sucking.
So it's not only what flow comes out of exhaust but also how much your engine is pumping
A 5 gals bucket is emptied in 2 minutes which seams to be the standard.

I changed the coolant. Level was fine but it was 4 years old and 250 hours on the engine.
Drained the coolant and flushed with fresh water a couple of times before refill.

I now believe that I am a bit over propped . Changed from a 2 blades to 3 blades ( not folding prop) last year and provided the old prop to manufacturer to set same pitching for the new one . I love the 3 blade as it did improve the ability of the boat maneuvering backward .
Which was my problem during winter as we dock the boat stern first.
So now with a bigger prop and I am probably asking more power from the engine .

Anyway I took the boat on a sea trial and all looks fine if I motor cruise under 3000 rpm which is absolutely fine by me At 2800 I reach hull speed so when we pushed it to 3200 last week ( strong tide) I probably pushed it too hard. I usually only use the engine in the winter to get out of marina docks. During the summer it's mostly sailing and this was the first time I had to motor for hours in a row .

So 2800 rpm it is, done with this engine, I feel I have already spent too much time on this problem. it's the end of summer , wind is picking up and lets go sailing !

Engines runs fine , no smoke at all, oil plug stays in place ...all is fine .
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