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post #1 of 8 Old 10-06-2012 Thread Starter
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Yanmar not starting

Hi all. Just want check my assumptions. The engine (2YM15) initially started, and I didn't hear the cheerful gurgle from the stern and a quick check confirmed there was no water coming out. Turned the engine off immediately, and no alarms sounded. Strainer was fine, impeller checked out, so it's not that. In the engine compartment, dirty water (black) had sprayed around - not oily to the touch. Also, on a second try the engine turned over, but would not start. Also, diesel(?) vapor appeared to be coming out of the air filter.

What I think happened is the mixing elbow clogged completely and probably blew out. There is still sufficient back pressure to keep the engine from starting. I'll be checking on this tomorrow but is this a reasonable hypothesis, and most importantly, is there any possible major damage to look for? Thanks.
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post #2 of 8 Old 10-06-2012
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Re: Yanmar not starting

Well, sprayed blackish water = blown exhaust hose due to blockage or hole after the riser. Blockage could be in anti-siphon riser. That doesn't explain why it won't start now however. Find the leak and it will probably lead you to the problem.

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post #3 of 8 Old 10-07-2012
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Re: Yanmar not starting

There is no harm in shutting off the salt water (cooling supply) sea **** and working strictly on the starting issue first ( no need to run long once fixed). Very basic on a deisel, fuel at injector pump. Then address the (no gurgling) sea water issues. Bear in mind that an impeller can look fine and even appear to spin with pump cover off yet still not work when the pressure from the cover is applied or rpms increase. I have had hands on experience with the impeller hub spinning inside the rubber. If you feel you have water in the combustion chambers turn the motor over back-wards by hand a couple of revolutions to prevent hydraulic damage. Check for water in oil also.
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post #4 of 8 Old 10-08-2012 Thread Starter
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Re: Yanmar not starting

Thanks all. The exhaust riser blew out before the mixing elbow, so that explains part of the problem. Should have made sure (asked) the PO if he cleaned the elbow regularly. Water in the combustion chambers has come to mind.
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post #5 of 8 Old 10-08-2012
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Re: Yanmar not starting

One thing I've noticed over the years in colder climates and passing cold fronts..diesel fuel thickens or condensation builds with drop in temps..try changing your filters more often and change to a slightly larger micron size and bleed your fuel system..
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post #6 of 8 Old 10-08-2012
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Re: Yanmar not starting

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Originally Posted by doug1957 View Post
Thanks all. The exhaust riser blew out before the mixing elbow, so that explains part of the problem. Should have made sure (asked) the PO if he cleaned the elbow regularly. Water in the combustion chambers has come to mind.
Yo Doug Vinigar twice a year thru the engine will help beat down the build up.
1)Start the engine,
2) Put a gal on Vinigar in somthing you can fit your suction hose into.
3) take your suction side hose off the water strainer and let it draw the vinigar thru your engine.
4) when all the vinigar has been pulled thru the engine, hook your hose back to the raw-water strainer.
It should help some. You will still need to do a good exhaust riser cleaning once a year. Good luck. I have a 2GM 13 yanmar and Its a great little engine. A little maintenance and they will last a lifetime.
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post #7 of 8 Old 10-08-2012
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Re: Yanmar not starting

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ltgoshen
Re: Yanmar not starting
Quote:
Originally Posted by doug1957 View Post
Thanks all. The exhaust riser blew out before the mixing elbow, so that explains part of the problem. Should have made sure (asked) the PO if he cleaned the elbow regularly. Water in the combustion chambers has come to mind.
Yo Doug Vinigar twice a year thru the engine will help beat down the build up.
1)Start the engine,
2) Put a gal on Vinigar in somthing you can fit your suction hose into.
3) take your suction side hose off the water strainer and let it draw the vinigar thru your engine.
4) when all the vinigar has been pulled thru the engine, hook your hose back to the raw-water strainer.
It should help some. You will still need to do a good exhaust riser cleaning once a year. Good luck. I have a 2GM 13 yanmar and Its a great little engine. A little maintenance and they will last a lifetime.
Are you saying that sucking the vinegar through the engine in a single pass is enough residence time to clean the exhaust riser or do you need to start the motor, suck the vinegar in, shut the motor down, wait 10 minutes or so for the vinegar to break up the scale, and then blow the vinegar out on the restart? I have also heard that you can use oxalic acid diluted about 1:1.

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post #8 of 8 Old 10-09-2012
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Re: Yanmar not starting

Might be easier to remove riser and mixing elbow for thorough cleaning. I'm sure your mixing elbow has foulup some.

Ken
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