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Old 26 June 2015, 17:53   #1
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Overheating Yanmar Diesel Inboard

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Hi guys, am after some advice please. Firstly what oil is best for a 24V Yanmar Diesel inboard and would low oil cause engine to overheat? Today coming back from IOW to Southampton the engine overheated and as well as low oil the white canister in pik was spirting out liquid? When I bought boat a couple of weeks ago I was told engine had just been serviced....?!? Thanks!
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Old 26 June 2015, 18:06   #2
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I would take it back! Also I would contact yam man who is the dude in your area.
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Old 26 June 2015, 18:09   #3
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I'm no expert on inboard engines. But in my car experiences overheating in the example shown I'd be immediately assuming that leaking liquid was coolant. That system looks to be under a decent bit of pressure. While coolant will have pressure that looks more than normal. There is two possibilities that come to mind: the coolant is hot and building up a head of steam as a result OR the cylinder head is leaking causing pressure in the coolant.

Low oil if it was genuinely low would reduce lubrication causing the engine to heat up. However a head gasket leak could also cause a loss of oil.

In short the two may well be related. Neither are good. Did you carry on running the engine back?

What is the white can? It clearly needs replaced. But I'm sceptical that sorting that coolant leak alone is going to sort your oil alarm.

(As an aside on a car the Red Oil Light is usually Oil Pressure rather than Oil Level - although a really low level will give low pressure. Orange Oil light on modern car is level... ...not sure which the Yanmar uses but suspect pressure - that being on is NOT GOOD...)
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Old 26 June 2015, 18:16   #4
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"Yam man" (Graham) on here (local to you as well) is an expert in these engines, and has done a lot of the hard work on mine for me! I can highly recommend him if you want a professional to take a look.

From the pics I can't quite tell what the white thing is - a fuel pre filter that has rusted through at the top? Certainly stuff shouldn't be coming out of it…! Looks like it needs to be replaced.

Were you getting steady cooling water out the exhaust, any blockages in the water intake pipework or water filter unit? I assume the water inlet seacock is fully open? If overheating (or running warmer than usual on the gauge) I would check those first.

Did you dip the oil before setting off and know if the level changed significantly during your passage, or was if it fairly low to begin with?
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Old 26 June 2015, 18:18   #5
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Quote:
Originally Posted by m4gu1re View Post
Hi guys, am after some advice please
I seem to remember Beamishken advising you to not buy that engine

Please don't take this personally, but you're way in over your head. That poor thing needs professional attention and you need someone to talk you through the entire (working) system.

Why do you think the oil level was low? Did it dip low or was it a warning lamp? Overheating: Was there raw cooling water flow? Was there sufficient coolant? Was there a coolant leak? The possibilities are legion and you risk wrecking the engine (if it isn't already). BTW, how do you know the engine was serviced? Did you see receipts?
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Old 26 June 2015, 19:14   #6
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Cheers guys. I have gone halves with original owner who's currently away. It's only the second time I've taken boat out and always had outboards before. Advice is appreciated before I speak to him about it.
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Old 26 June 2015, 20:11   #7
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Comes as no surprise that that thing is overheating the white canister looks like a fuel filter so presumably leaking diesel
Possible causes of overheating one or more of the following:-
Blocked oil cooler
Blocked intercooler
Blocked heat exchanger
Worn or damaged raw water pump
Low water level in header tank / exhaust manifold
Blown head gasket
Cracked block
Colapsed intake hose
Blocked raw water intake
Plus a few I've probably missed
A service wouldn't show up a overheating problem unless it included an extended sea trial which they usually don't
You need expert advice which unfortunately doesn't come cheap
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Old 26 June 2015, 20:13   #8
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Cheers. It was supposedly a Yanmar engineer that did the service, a friend of the now part owner. The things mentioned give me a head start when bringing it up with him. Appreciated.
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Old 26 June 2015, 20:59   #9
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perhaps not what you want to hear but the only thing you need to bring up with him is i want out and get your wedge back. seriously, that has not been looked after that motor. if the motor hasn't been looked after then what else hasn't!?!

i do hope you didn't trust the owners friend that the motor has been serviced and you paid for your own due diligence before buying it?

cheers
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Old 27 June 2015, 02:00   #10
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Looks like a fuel filter is peeing out diesel. Judging by the picture of the engine compartment, it's taken a knock with the engine cowl or lid, rusted through, etc. That still wouldn't explain the overheating.
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