Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Vintage Mercedes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-29-2017, 10:44 AM
CTD's Avatar
CTD CTD is offline
Registered User
 
Join Date: Jan 2014
Posts: 160
Distributor Stuck in Block

Greetings,

I have a stuck distributor on a '68 230 with the M180.949 six cylinder engine. The distributor appears to be stuck in place and will not rotate for me to adjust the engine's timing.

I have, so far, squirted penetrating oil where the cast iron distributor meets the aluminum base, and where the aluminum base meets the block, and let it soak overnight a few times. I have gently tapped the bottom edge of the distributor with a small hammer to try and shock it loose with the penetrating oil. I have also run the engine up to full temperature to warm up the block where it is hot to the touch, and then attempted to move the distributor using the methods described above. All have been unsuccessful so far, and the distributor has refused to budge.

The clamp screw and the bolt on the fine adjuster have been loosened when I try to move the distributor. There is also a third screw on the aluminum base where it mates to the block which I removed.

As for the engine's history: it has low miles since a rebuild about 25 to 30 years ago. The distributor has likely not moved since at least 1994 or 1995. The engine runs well with minimal oil consumption.

I think what is going on is there is some corrosion where the cast iron and aluminum surfaces mate up.

Does anyone have any advice or further options I can pursue without damaging the distributor?
Reply With Quote
  #2  
Old 08-29-2017, 06:51 PM
Registered User
 
Join Date: Jan 2012
Posts: 5,219
Do a search of the vintage section, there was a post similar to yours.

Don't tap too hard on the distributor, the housing can crack.
Reply With Quote
  #3  
Old 08-29-2017, 07:40 PM
Registered User
 
Join Date: Sep 2001
Posts: 289
You are trying the right things, continued patience along with penetrating oil when the engine is hot is a good procedure. Could also try getting the engine hot and cooling the distributor with ice...expand the block while contracting the distributor then add penetrating oil.

Can you put channel locks with the teeth wrapped in tape and gently turn the distributor ONLY at the base?

The timing can also be set by sacrificing some dwell angle/point gap.

Good luck!!!
__________________
Does a Caddy stretch? No, but a Mercedes bendz.
Reply With Quote
  #4  
Old 08-30-2017, 06:07 PM
Larry Delor's Avatar
What, Me Worry?
 
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,041
Maybe alternate with something cold? If you hold canned air upside down and squeeze, the stuff that comes out will freeze stuff. Maybe you can shrink the metal on the dist. enough. - just throwing that out there for consideration.
__________________
"...rationality of thought imposes a limit on a person's concept of his relation to the cosmos." -Nash

04/71 280SE 195k
09 Jetta TDI
Reply With Quote
  #5  
Old 08-31-2017, 04:31 PM
Mighty190's Avatar
Registered User
 
Join Date: Apr 2016
Location: Lafayette Indiana
Posts: 132
Generally speaking hitting rusty things with the impact or an air chisel is a big help. I've only ever encountered stuck distributors on cheap to replace domestic stuff and I have broken some. Be careful not to crank on it. What I would probably do is run an impact on the retainer bolt or one near the distributor while trying to gently work it back and forth with channel locks.
__________________
Follow the team at https://www.facebook.com/MacIntyreMotorsports/
Reply With Quote
  #6  
Old 08-31-2017, 08:27 PM
CTD's Avatar
CTD CTD is offline
Registered User
 
Join Date: Jan 2014
Posts: 160
That might be a good idea. It's been a few days, and that cranky old distributor still won't budge. I'm thinking that I may start looking for an extra distributor to have on hand in case I end up having to resort to more "violent" tactics.

As an interim solution, I was able to adjust the point gap to where I could get the engine to idle OK so I can putter around without any difficulty. That came in handy as I needed the 230 Fintail's large trunk to remove stuff from a storage unit today.
Reply With Quote
  #7  
Old 09-19-2017, 10:23 AM
CTD's Avatar
CTD CTD is offline
Registered User
 
Join Date: Jan 2014
Posts: 160
Fast forward 20 days of penetrating oil, and the distributor still won't budge. It likely has not moved in 25 years or more. I have decided to order a replacement unit on E-bay, which I will have rebuilt by a distributor shop. When that is finished, I am going to do whatever it takes to get the pre-existing distributor out, even if it needs to be broken.

The picture below is of the replacement distributor core that I ordered. It is coming with its aluminum mounting bracket.

I suspect that there is (in the pre-existing distributor in my car) galvanic corrosion between the cast iron distributor case and the aluminum mounting bracket. I think that if I can remove/destroy the aluminum mounting bracket, the pre-existing distributor will come out.

When it comes time to replace the distributor, I will also check the grounding strap on the engine, and clean/replace it and/or its connections if necessary to prevent any electrical aiding of future galvanic corrosion.

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 09:00 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page