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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #31  
Old 05-15-2012
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Re: Runaway Yanmar 2qm15 HELP!

Will, Thanks for the tip. Yes I removed everything from the engine during the rebuild. When I inserted the pump I did make sure the rack ball was inserted in the throttle control assembly. It's hard to say at this point if there are any idle issues or not because I haven't been able to get out there to readjust the timing. However, I lost the position on the stop cable and I'm not sure how to get that in the right position to stop the engine. Also the throttle assembly (spring) seems looser than when I took it off. Not sure if something is screwed up there... Once I get the to the boat I'll have a better idea if I am going to need further help getting the throttle assembly and stop cable adjusted correctly. So I have two shims and will torque to spec but how would I know if the fuel delivery is correct? Thanks for your advice.
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Old 05-16-2012
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Re: Runaway Yanmar 2qm15 HELP!

Quote:
Originally Posted by miamiz View Post
Will, Thanks for the tip. Yes I removed everything from the engine during the rebuild. When I inserted the pump I did make sure the rack ball was inserted in the throttle control assembly. It's hard to say at this point if there are any idle issues or not because I haven't been able to get out there to readjust the timing. However, I lost the position on the stop cable and I'm not sure how to get that in the right position to stop the engine. Also the throttle assembly (spring) seems looser than when I took it off. Not sure if something is screwed up there... Once I get the to the boat I'll have a better idea if I am going to need further help getting the throttle assembly and stop cable adjusted correctly. So I have two shims and will torque to spec but how would I know if the fuel delivery is correct? Thanks for your advice.
Sounds like the re-assembly of the pump/governor assembly is tricky business. Suggest one thing at a time:

1. Re-set timing, if it is off as you suspected. If it still runs away:

2. Take pump assembly to a good shop and have them re-calibrate it

Let us know how it works out.

Paul T
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Old 05-19-2012
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Re: Runaway Yanmar 2qm15 HELP!

Finally got out to the boat today. Took off the gear cover and tried to set cylinder one (Fly wheel side) to TDC. The timing mark lands 180 degrees away from the cam gear. So there is no way that the timing marks on the cam gear could ever align with the drive shaft in this configuration. So i realigned the timing marks "o"s to "o"'s on both the cam and crank shaft. This puts the front gear side to TDC. Put everything back together again. Started the engine and was running at a high RPM. Resolved to loosen the bolts on the fuel pump. I was able to get the RPM to a normal range. However, the RPM was surging up and down and the throttle response seemed sluggish. Might be because fuel pump wasn't sealed and was either loosing vacuum or vibrating too much. It' still seems to have blow by and smoking allot. There was an oil film in the water. So I think I have two problems; first I need to shim the pump and second I need to pull the pistons to see if I have a ring stuck or something. Once again any of your thoughts are appreciated!
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Re: Runaway Yanmar 2qm15 HELP!

Here's a picture
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Runaway Yanmar 2qm15 HELP!-securedownload.jpg  
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Old 05-20-2012
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Re: Runaway Yanmar 2qm15 HELP!

The timing marks appear to be right? Not sure about your description of the "pump". Lift pump or injector pump? Can't figure out what loosening it would do. Is the oil level correct? Is it contaminated with fuel? If the blowby is excessive it may be "feeding" the engine extra fuel. Before pulling the pistons I suggest you do a compression test.
Will it idle down and continue to run? Does the injector pump move to effect fine timing settings? If so, it may be off. If the lift pump is suspect you might try a gravity feed fuel source like an outboard gas can.

Paul T
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Re: Runaway Yanmar 2qm15 HELP!

How about a video of it starting from cold and then up & down the RPM scale?

Paul T
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Re: Runaway Yanmar 2qm15 HELP!

I was referring to the injector pump (sorry). It has shims that control the height that the injector pistons ride above the cam lobes. Too low and it pumps too much fuel. In my case loosening a little seems to bring the idle down to a normal level. I will get you guys a video
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Re: Runaway Yanmar 2qm15 HELP!

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Re: Runaway Yanmar 2qm15 HELP!

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Re: Runaway Yanmar 2qm15 HELP!

Yanmar 2qm15 Injector pump movement problem - YouTube
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