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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar YSE 8 fuel injection issue?
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Yanmar YSE 8 fuel injection issue? Reply to Thread
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Topic Review (Newest First)
04-26-2013 12:49 AM
sadie anne clawe
Re: Yanmar YSE 8 fuel injection issue?

Hey it has been a while since I posted anything on here.
Anybody still following the thread, the mechanic who recently rebuilt my engine didn't tell me explain the details, just that it was submerged partially and he kicked it back to running. It ran great for a year or so with the exception of the black sooty water out the cooling system. I replaced some of the pipes and this seemed to help a bit. It doesn't seem there is a cracked head gasket as of now because I run it extensively without any explosion. It has spit diesel and oil out from somewhere and its oil leaks do seem to be increasing. I have a few folks take a look at it and nobody has been able to diagnose the issue but could be there is an internal linkage regulator issue.
I'm taking it to a pro tomorrow so we'll see how it goes...
01-29-2013 12:52 PM
casey1999
Re: Yanmar YSE 8 fuel injection issue?

http://sailingboatefaki.gr/Engine%20Manuals.htm

On Zip File 4 (Parts List) of above link (pages 27a and 29b) you will find the diagram of the governor system. Check the external springs for throttle return are all on your engine and working. Could be a problem with the internal governor as shown on the diagram.
01-28-2013 07:48 PM
Faster
Re: Yanmar YSE 8 fuel injection issue?

Good work, casey!
01-28-2013 07:47 PM
casey1999
Re: Yanmar YSE 8 fuel injection issue?

Here is another manual:

http://sailingboatefaki.gr/Engine%20Manuals.htm

Look at page 18. I cannot quite follow what they are talking about but looks like some speed governor parts can fall out or be damaged when removing the fuel pump. Maybe some parts of the governor system are now damaged or even missing.

Note page 39 and 40 of above manual talk about using shims on the fuel injection pump to set the engine timing.
01-28-2013 07:07 PM
casey1999
Re: Yanmar YSE 8 fuel injection issue?

Here is manual (not complete shop manual but has some good info.)
http://www.yanmarmarine.com/theme/ya...-ENG-FR-ES.pdf

To stop the engine the manual seems to indicate you just shut off fuel to the engine by the fuel valve. Is this what you did?

Have you checked the throttle linkage is not sticking? Did the engine run ok after the rebuild and only recently gave you a problem?

Regards
01-28-2013 01:14 PM
PorFin
Re: Yanmar YSE 8 fuel injection issue?

Quote:
Originally Posted by sadie anne clawe View Post
The mechanic who installed the pump didn't really know how to time a marine engine.
I humbly suggest you find another mechanic -- timing has nothing to do with intended application (whether automotive, marine, industrial or agricultural.) If he thinks there is a difference, then he's not the guy you want poking around on your engine.
01-28-2013 12:59 PM
dabnis
Re: Yanmar YSE 8 fuel injection issue?

Quote:
Originally Posted by sadie anne clawe View Post
I tried to Check the oil while my engine was running once and it sprayed in my face. Is this what you mean by excessive pressure? By recently rebuilt I mean in the last two years. The mechanic who installed the pump didn't really know how to time a marine engine. I also agree the pumps not the issue so then what is? Yes it could be timing. My manual suggests installing shims to adjust the timing but I have no idea where to begin in doing this.
If the oil sprayed in your face it is an indication that there is very high pressure in the crankcase. Maybe the engine oil is over filled? You might try blowing back through the crankcase breather hose from where it goes back into the intake manifold. Or if there is a PVC valve blow back from there. There should be littlt to no resistance. If there is, I suggest you replace the hose and PVC valve, if there is one. If there is oil leakage at the fromt or rear main bearing seals that may be another indication of excessive crankcase pressure.

Sounds like the injector pump may be faulty or not timed properly?

Black sooty water in the coolant may be from a blown head gasket? Perhaps another cause of high crankcase pressure?

If you don't have some experience with all of this a GOOD diesel mechanic may be a good investment. I think you said your original mechanic said he didn't know how to time a marine engine? That is a pretty basic skill for ANY diesel mechanic to have. Let us know what you find.

Paul T
01-28-2013 10:31 AM
Faster
Re: Yanmar YSE 8 fuel injection issue?

Quote:
Originally Posted by sadie anne clawe View Post
Also what is blow-by?
"Blow by" is when you don't have a good ring seal, and the high compression in the cylinder leaks by, pressurizing the crankcase. This is why I asked about having the cap off while running.

The crankcase is normally vented via your 'positive crankcase vent (PCV) back into the air intake to keep the smell and fumes down. If you have blowby it's possible that there's enough 'fuel' in the fumes that the engine keeps on running, or 'runs away' despite the governor's best efforts.

The one thing in your scenario that points away from that problem is that you were able to stop the engine with the fuel cutoff - which likely wouldn't have worked if you were in fact running on fumes. In that case the only way to kill the engine is to block the air intake.

Hopefully it was rebuilt by pros, but these are not complicated engines and a good mechanic should be able to sort things out in short order.

Good luck..
01-28-2013 03:22 AM
sadie anne clawe
Re: Yanmar YSE 8 fuel injection issue?

Also what is blow-by?
01-28-2013 03:19 AM
sadie anne clawe
Re: Yanmar YSE 8 fuel injection issue?

I tried to Check the oil while my engine was running once and it sprayed in my face. Is this what you mean by excessive pressure? By recently rebuilt I mean in the last two years. The mechanic who installed the pump didn't really know how to time a marine engine. I also agree the pumps not the issue so then what is? Yes it could be timing. My manual suggests installing shims to adjust the timing but I have no idea where to begin in doing this.
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