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Old 29-07-2021, 03:41   #1
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Bmw d7

i have a problem with my bmw d7 that i cant seam to fix

I bought a sailboat with a bmw d7 that didn't start. So i started rebuild it
Changed Piston rings
Got the injector renoveted
Got the injector pump renovated
New gasket kit

And its starts very easy but then revs up to max and i cant make it stop with the throttle or stop wire. Only by pulling the diesel hose it stops. I removed the pump and refitted it to be sure its in place and still same thing.
What is going on ?
Thanks for any answers
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Old 29-07-2021, 04:24   #2
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Re: Bmw d7

Welcome to the forum, Samuel. Hopefully a person familiar with that engine will step in.
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Old 29-07-2021, 05:31   #3
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Re: Bmw d7

Greetings and welcome aboard the CF, Samuel.

BMW 'D7' Workshop Manual ➥ https://bmwmarine.com/media/BMW%20D7...p%20Manual.pdf
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Old 29-07-2021, 05:42   #4
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Re: Bmw d7

Quote:
Originally Posted by Samuelcoster View Post
i have a problem with my bmw d7 that i cant seam to fix

I bought a sailboat with a bmw d7 that didn't start. So i started rebuild it
Changed Piston rings
Got the injector renoveted
Got the injector pump renovated
New gasket kit

And its starts very easy but then revs up to max and i cant make it stop with the throttle or stop wire. Only by pulling the diesel hose it stops. I removed the pump and refitted it to be sure its in place and still same thing.
What is going on ?
Thanks for any answers
While I don't know the BMW engines I would say that something was not reassembled correctly in the injector pump. If throttling down with the lever on the injector pump doesn't reduce RPM then its likely the rack is stuck full open.
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Old 29-07-2021, 13:45   #5
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Re: Bmw d7

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Originally Posted by pcmm View Post
While I don't know the BMW engines I would say that something was not reassembled correctly in the injector pump. If throttling down with the lever on the injector pump doesn't reduce RPM then its likely the rack is stuck full open.
How do i get the rack unstuck. And im not really sure what the rack is ?
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Old 29-07-2021, 14:30   #6
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Re: Bmw d7

I’m totally unfamiliar with your engine but I found a parts manual. The rack pin is circled in red and you probably need to extract the injector pump to get an idea of how the governor interacts with it.
I’m interested to know the magnitude of the engine overspeed. A fully open rack usually leads to destruction of the engine but you were able to calmly remove the fuel line and wait for it to starve/stop....... that might mean only a high idle event with the governor still controlling the injector pump.........I’d start off by investigating the settings of the speed control lever before removing the pump BUT take off the air intake filter and be prepared to block the air supply because no response to the manual stop is a a bad omen.
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Old 29-07-2021, 22:09   #7
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Re: Bmw d7

Okey, thanks for the good information. I will try this.
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Old 30-07-2021, 01:58   #8
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Re: Bmw d7

It’s necessary to install the injector pump on the bottom of the cam so you can feel that the pin is engaged.....and to preserve the original shims, they are to set the point of injection.
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Old 30-07-2021, 02:34   #9
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Re: Bmw d7

I have put everything back together now. And will try to start it. I also have something to block the air filter in case it run away. But i will post a video here when im done. And hopefully it idles nicely ☺️🤞🤞🤞
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Old 30-07-2021, 04:00   #10
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Re: Bmw d7

Hoping all goes well[emoji120]
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Old 31-07-2021, 13:34   #11
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Re: Bmw d7

Update.
Tested starting today.
It started and i could decrease power with the throttle. I found out that a tennis ball was perfekt size to block of the air intake incase it started to run away. It died after letting of throttle then started again and it started run away. Let of throttle, no response. Blocked of air intake and it died almost instantly. Feels better that i found a way to stop it. But weird how it first idles nicely and then second time runs aways ????
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Old 31-07-2021, 14:33   #12
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Re: Bmw d7

Block it only with something hard like a board. If you ingest something soft into the engine it may be a big problem.
Buy that's a tough one on the runaway... It's not got too much oil in it right?
How in the world did you find someone to rebuild that injection pump? seems like knowledge of that would be rare....
Sounds like a pump issue or governor issue..
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Old 31-07-2021, 16:00   #13
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Bmw d7

There is what I think is a coldstart device ( item 16) it’s possible that it’s activated. Small Diesel engines are damned difficult to regulate at idle, the amount of fuel needed is very very small and even a little bit of friction in the Governor mechanism will cause wild fluctuations.
Good that you are comfortable with the emergency shutdown procedure.
Did you have to do anything at all to the Governor during the initial engine overhaul?
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Old 01-08-2021, 00:22   #14
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Re: Bmw d7

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Originally Posted by Cheechako View Post
Block it only with something hard like a board. If you ingest something soft into the engine it may be a big problem.
Buy that's a tough one on the runaway... It's not got too much oil in it right?
How in the world did you find someone to rebuild that injection pump? seems like knowledge of that would be rare....
Sounds like a pump issue or governor issue..
Its a quite small hole so i cant go through.
Gonna check the oil.
The pump got renovated at a shop that only works with diesel pumps and very old engine. 1960 and older. Classic machin mechanic shop
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Old 01-08-2021, 00:24   #15
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Re: Bmw d7

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Originally Posted by skipperpete View Post
There is what I think is a coldstart device ( item 16) it’s possible that it’s activated. Small Diesel engines are damned difficult to regulate at idle, the amount of fuel needed is very very small and even a little bit of friction in the Governor mechanism will cause wild fluctuations.
Good that you are comfortable with the emergency shutdown procedure.
Did you have to do anything at all to the Governor during the initial engine overhaul?
Im familiar with the cold start because the engine do only start if i pull the cold start. And full throttle. But once it starts it goes back in. Again so its seams to work.
Haven't done anything to the governor mechanisms
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