Antique Engines and Old Iron

[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Antique Engine Community > Small Air Cooled Gasoline Engines > Chain Saw Collectors
Forgot Password? Join Us!

Notices

Chain Saw Collectors Vintage chainsaws and other air cooled gas engine saws, collecting and restoring.

Chain Saw Collectors

Sachs Dolmar Ignition Woes


this thread has 59 replies and has been viewed 11584 times

Reply
 
Thread Tools Display Modes
  #21  
Old 07-17-2016, 04:11:49 PM
tntatro tntatro is offline
Registered
 
Join Date: May 2016
Location: Marietta, Ohio, USA
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

I've checked the pressure and vacuum and it holds both. I also did a pressure test on the fuel line and it's also good. I've tried tuning the carburetor to different settings balancing between the L and idle screw.

I had to advance the timing to get it to start. I found that it would start anywhere between 1/2" to 1 - 1/8" advanced (outer diameter of flywheel). At 1 - 1/8 the cord would pull back pretty bad so I set it to about 7/8". I'll try 1/2" again but I'm pretty sure it idled the same there also. I couldn't get it to start at any less than 1/2" advanced.
Reply With Quote
Sponsored Links
  #22  
Old 07-17-2016, 07:31:27 PM
tntatro tntatro is offline
Registered
 
Join Date: May 2016
Location: Marietta, Ohio, USA
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

I tried the timing advanced 1/2" and it still isn't right. I think I'll have to get a timing light. I've been messing with this ignition for a while and can't seem to get the saw to run right. It ran fine with a different ignition.
Reply With Quote
  #23  
Old 07-18-2016, 11:27:37 AM
bigGURN bigGURN is offline
Registered-III
 
Join Date: Nov 2011
Location: Idaho
Posts: 1,560
Thanks: 343
Thanked 5,033 Times in 808 Posts
Images: 1
Default Re: Sachs Dolmar ignition woes

How does it run with everything in the stock location? You shouldn't have to advance it that far. I've never had to advance it more than the ignition plate would allow.
Reply With Quote
  #24  
Old 04-03-2017, 04:06:19 PM
paul99 paul99 is offline
Registered
 
Join Date: Mar 2017
Location: Brecon, Powys, Wales, United Kingdom
Posts: 1
Thanks: 1
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

Hi, My first post here but thought I should say a big thank you to bigGURN for his fix outlined in post #2 . Roughly following it I just managed to get my Dolmar 152 running again after the Bosch ignition packed up a while ago. I did think I might have to fork out £80 ($100) on a replacement saegenspezi ignition from Germany after the foggysail fix (found elsewhere on the net) failed (resulted in a spark but was intermittent and too weak to start the saw).

It appears the Nova II module isn't so easily sourced here in the UK (just "Nova" marked units are available but without knowing the difference to the "Nova II" and the fact they are twice the price of alternatives I gambled on single terminal (metal body serves as the -ve leg) SIG-01 unit as it was cheap ($8) and would arrive quickly (ordering a Nova II from the USA was the next step if the Sig didn't work). I chose to mount the unit externally (underneath the top cover) rather than cutting the Bosch module off the stator plate to make room for it under the flywheel. I did run a ground wire from the coil mounting screw direct to the body of the Sig rather than rely on a earth from the case.

Having done some reading about these universal ignition modules I was concerned that it might not work as they nearly all state that their not recommended for use with flywheels with multiple magnets which these Bosch flywheels do appear to have? bigGurn's success and now my own suggests that the multiple magnet isn't actually an issue - at least not with these particular Bosch flywheels.

One more point, as bigGurn mentioned, I too had to advance the ignition as far as it would go to get a strong spark and to start the saw. I do intend checking the timing with a light and degree wheel at some point but I'm guessing that as the saw starts easily without kicking back and runs perfectly (not under load this far) I'm guessing it can't be very far from being close to the original 26° BTDC ? .

Should a test under load not go successfully (hopefully this weekend - if I get an opportunity this week to check over the rest of the saw) I will be sure to let you all know..

Thanks again to bigGurn for taking the time to post the fix I'm sure it must have helped a great many people like myself that have suffered with a failed Bosch ignition....
Reply With Quote
  #25  
Old 04-03-2017, 04:10:01 PM
bigGURN bigGURN is offline
Registered-III
 
Join Date: Nov 2011
Location: Idaho
Posts: 1,560
Thanks: 343
Thanked 5,033 Times in 808 Posts
Images: 1
Default Re: Sachs Dolmar ignition woes

I pleased to hear it worked for you. I've done a dozen or so of these and have yet to experience an issue. Good luck!
Reply With Quote
The Following User Says Thank You to bigGURN For This Post:
  #26  
Old 04-18-2017, 01:48:31 AM
The Engineer's Avatar
The Engineer The Engineer is offline
Subscriber
 
Join Date: Apr 2006
Location: Christchurch, New Zealand
Posts: 284
Thanks: 183
Thanked 93 Times in 62 Posts
Images: 24
Default Re: Sachs Dolmar ignition woes

yes thanks so much for this info I repaired a dolmar 144 I think it was but was able to imbed the cap back into the case and used araldite resin to imbed timming was the same a great fix thanks again
Reply With Quote
  #27  
Old 04-18-2017, 09:16:09 AM
I like oldstuff I like oldstuff is offline
Subscriber
 
Join Date: Jan 2012
Location: Milwaukee, Wisconsin, USA
Posts: 5,588
Thanks: 1,349
Thanked 5,900 Times in 2,311 Posts
Default Re: Sachs Dolmar ignition woes

It's pretty cool how the talents here can fabricobble things back to life. My cap replacement is working fine as I used it a few weeks ago after some high winds and a neighbour lost a 20 inch ash. I whittled that thing to a pile of sawdust for him in short order. Then my V4 powered splitter and he now has firewood for a few years.
Reply With Quote
  #28  
Old 08-05-2017, 11:27:17 AM
Northmen Northmen is offline
Registered
 
Join Date: Aug 2017
Location: Brøttum, Hedemark, Norway
Posts: 18
Thanks: 1
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

Hey guys,

I'm new here in this forum, I have a dolmar 153 and had the same problems with the coil as you guys.

So I fixed the nova2 module inside the coil as biggurn has showed, i have a great spark but the engine give no life at all.
So I think it's the time that is wrong i have no idea how to fix that can somebody explain how to set the engine an the spark on the right position?
I am working already a few ours on this problem, so if someone can help me i am very happy thank you so much.
Reply With Quote
  #29  
Old 08-05-2017, 03:06:04 PM
Northmen Northmen is offline
Registered
 
Join Date: Aug 2017
Location: Brøttum, Hedemark, Norway
Posts: 18
Thanks: 1
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

Hey, what paul 99 says about 26 BTDC how do know that? And are there points on the flywheel where you can see it?
Maybe someone want to take the time to explain it?
I send the pictures so it's easier to talk about it and if I did it not right please tell me
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	61
Size:	206.3 KB
ID:	287976  
Reply With Quote
  #30  
Old 08-05-2017, 03:14:22 PM
Northmen Northmen is offline
Registered
 
Join Date: Aug 2017
Location: Brøttum, Hedemark, Norway
Posts: 18
Thanks: 1
Thanked 0 Times in 0 Posts
Default Re: Sachs Dolmar ignition woes

The yellow lines, I made new 1 for the start/stop switch and the other 1 from the coil to the nova2
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	57
Size:	220.4 KB
ID:	287977  
Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

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

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Military Standard 4A032 ignition woes kgraeser Military MEP and Aircraft Gen-Sets 24 11-12-2018 06:17:38 PM
Fichtel and Sachs Ignition Information and Parts TomLatham Antique Gas Engine Discussion 1 04-11-2016 04:33:35 AM
Wisconsin TRA12D ignition woes s100 Wisconsin Engines 7 02-01-2015 09:16:04 AM
Briggs 23D Ignition Woes gootsch Small Air Cooled Gasoline Engines 5 09-22-2014 01:28:00 PM
Onan MCCK ignition woes, mag or points? wbmiller3 Onan Generators 7 11-19-2012 11:30:11 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 12:06:20 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2016 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277