Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 29-07-2021, 03:41   #1
Registered User

Join Date: Jul 2021
Posts: 9
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
Samuelcoster is offline   Reply With Quote
Old 29-07-2021, 04:24   #2
Senior Cruiser
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 3,681
Re: Bmw d7

Welcome to the forum, Samuel. Hopefully a person familiar with that engine will step in.
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 29-07-2021, 05:31   #3
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 43,200
Images: 241
Re: Bmw d7

Greetings and welcome aboard the CF, Samuel.

BMW 'D7' Workshop Manual ➥ https://bmwmarine.com/media/BMW%20D7...p%20Manual.pdf
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 29-07-2021, 05:42   #4
Registered User
 
pcmm's Avatar

Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 1,503
Images: 2
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.
pcmm is offline   Reply With Quote
Old 29-07-2021, 13:45   #5
Registered User

Join Date: Jul 2021
Posts: 9
Re: Bmw d7

Quote:
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 ?
Samuelcoster is offline   Reply With Quote
Old 29-07-2021, 14:30   #6
Registered User

Join Date: Feb 2010
Location: Australia
Posts: 957
Re: Bmw d7

Iím 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.
Iím 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.........Iíd 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.
Pete. Click image for larger version

Name:	IMG_2648.jpg
Views:	23
Size:	212.4 KB
ID:	242965Click image for larger version

Name:	IMG_2649.jpg
Views:	23
Size:	200.6 KB
ID:	242966
skipperpete is offline   Reply With Quote
Old 29-07-2021, 22:09   #7
Registered User

Join Date: Jul 2021
Posts: 9
Re: Bmw d7

Okey, thanks for the good information. I will try this.
Samuelcoster is offline   Reply With Quote
Old 30-07-2021, 01:58   #8
Registered User

Join Date: Feb 2010
Location: Australia
Posts: 957
Re: Bmw d7

Itís 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.
skipperpete is offline   Reply With Quote
Old 30-07-2021, 02:34   #9
Registered User

Join Date: Jul 2021
Posts: 9
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 ☺️🤞🤞🤞
Samuelcoster is offline   Reply With Quote
Old 30-07-2021, 04:00   #10
Registered User

Join Date: Feb 2010
Location: Australia
Posts: 957
Re: Bmw d7

Hoping all goes well
skipperpete is offline   Reply With Quote
Old 31-07-2021, 13:34   #11
Registered User

Join Date: Jul 2021
Posts: 9
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 ????
Samuelcoster is offline   Reply With Quote
Old 31-07-2021, 14:33   #12
Registered User
 
Cheechako's Avatar

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 24,015
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..
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 31-07-2021, 16:00   #13
Registered User

Join Date: Feb 2010
Location: Australia
Posts: 957
Bmw d7

There is what I think is a coldstart device ( item 16) itís possible that itís 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?
skipperpete is offline   Reply With Quote
Old 01-08-2021, 00:22   #14
Registered User

Join Date: Jul 2021
Posts: 9
Re: Bmw d7

Quote:
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
Samuelcoster is offline   Reply With Quote
Old 01-08-2021, 00:24   #15
Registered User

Join Date: Jul 2021
Posts: 9
Re: Bmw d7

Quote:
Originally Posted by skipperpete View Post
There is what I think is a coldstart device ( item 16) itís possible that itís 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
Samuelcoster is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
BMW Marine Diesel D7 Jmolan Engines and Propulsion Systems 17 01-03-2021 16:37
A New Twist in the BMW/Oracle vs Alinghi Showdown TaoJones Multihull Sailboats 13 01-02-2010 08:39
BMW Oracle Remasted sneuman Multihull Sailboats 22 13-11-2009 02:06
BMW Oracle Dismasted Yotboss Multihull Sailboats 51 12-11-2009 16:32
BMW diesel and black steel diesel fuel tanks johnpair Engines and Propulsion Systems 12 08-01-2009 15:30

Advertise Here


All times are GMT -7. The time now is 00:20.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.