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post #1 of 10 Old 12-09-2012 Thread Starter
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Yanmar hoses

Noticed recently that that at least two of my cooling water hoses on Yanmar 54hp engine are "sucked" flat.
The top hose from thermostat to manifold is a short 90 degree job, it is the original Yanmar part; just looks very wrong. Same issue with longer hose under the belt cover.
Any comments?
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post #2 of 10 Old 12-09-2012
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Re: Yanmar hoses

Looks like a hose that wasn't intended for suction/vacuum conditions, The first pic doesn't look 'kinked' so much as 'sucked in', as you say...

It all looks pretty new - is this something that's recently cropped up?

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post #3 of 10 Old 12-10-2012
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Re: Yanmar hoses

Do you have coolant overflow subtank? Maybe something is missing there. Seems like vacuum at work.

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post #4 of 10 Old 12-10-2012
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Re: Yanmar hoses

Quote:
Originally Posted by trantor12020 View Post
Do you have coolant overflow subtank? Maybe something is missing there. Seems like vacuum at work.
This is pretty standard on a cool engine especially if it is a little low on coolant. The coolant overflow is only open to the atmosphere if the engine "pops" the inner seal of the radiator cap.. This is a sealed system thus when it is hot the hoses will be full size and when it cools they get sucked in..

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post #5 of 10 Old 12-10-2012
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Re: Yanmar hoses

A couple of questions
Are these the origina lhoses from when boat was new? or replacements ?
Typically origina hoses have engine paint over spray on them
If replacement hoses were they from Yanmar and how old
If not Yanmar maybe some one used a piece of straight hose to make the replacement when the actual replacement should have been manufactured with a curve
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post #6 of 10 Old 12-10-2012 Thread Starter
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Re: Yanmar hoses

thanks all.
looks like a cool engine sucked in. The expansion tank explanation sounds like the issue. (or non issue).
Hoses are original Yanmar so am confident they are correct.
I am okay on coolant level, but the suck in based on temperature change is most likely the cause.
appreciate the experience.
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post #7 of 10 Old 12-11-2012
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Re: Yanmar hoses

Something about the hose clamps(appear to be a size too large) and the missing Yanmar overlay paint on the hoses makes me think they are not OEM parts...but could have been replaced at a later time. Check your expansion tank's hose and 'T' fitting under the pressure cap..could be clogged
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post #8 of 10 Old 12-17-2012
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Re: Yanmar hoses

Hi Greg,

It seems you have the same engine I do, 4JH5E. I took a pic of one of my coolant hoses after a run then a long period of cooling. Mine does not suck in like yours does. I forgot to get a picture of the other hose, I will do that also.

Sorry for the crappy picture quality.

btw - the first thing I did was to deep six the fan belt cover, it was really annoying to me.
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post #9 of 10 Old 12-17-2012
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Re: Yanmar hoses

I think SaWhet has it right. On my Yanmar one of the coolant hoses must have been formed with a bend in it.

I did not know where you can buy them, I assume from Yanmar but I had to do some fancy bending to get a straight hose on and not have it hit the Vee belt.
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post #10 of 10 Old 12-17-2012
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Re: Yanmar hoses

I believe the Yanmar part number is 129671-49210. I am assuming you have the 4JH5E. I have the PDF parts manual for that motor. Just PM me where I can send it to electronically.
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