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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-07-2009, 09:46 PM
Registered User
 
Join Date: Feb 2003
Location: Oklahoma
Posts: 1,025
'86 560SL spark plug thread problem

I am having trouble installing one plug - I just can't get it started. It looks like most of the threads are there, just the one right at the top of the hole seems to be messed up. Can I try a thread chaser - anyone think that may work? Or do I risk messing it up more?

Is this a 14 x 1.25 thread?

Ryan
__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE
Reply With Quote
  #2  
Old 02-07-2009, 10:03 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804

Yes,,

If you are handy, you can make a chaser from an old plug by filing a groove lateraly on the thread at c/l with the flat cutting edge on the tightening direction side.
If you are not, then get the tool....and go slow, turning backwards first to seat the tool...it's feel thing.
__________________
A Dalton
Reply With Quote
  #3  
Old 02-07-2009, 11:26 PM
Registered User
 
Join Date: Feb 2003
Location: Oklahoma
Posts: 1,025
Thanks Arthur,

I will probably buy the tool - I'm just not sure if I need the thread chaser or should I get a tap?

I think I might try a thread chaser first - and if that doesn't work, I might then try the tap? Does that make sense?

ryan
__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE
Reply With Quote
  #4  
Old 02-07-2009, 11:38 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Hard to tell w/o seeing it...screwed up threads are on a one on one basis..they all take some finesse and everyone is different..the rule is slow and easy...........and don't force anything. Try to keep the tap or chaser straight up at 90 degrees on x and y axis is of the utmost importance...you can do it..... try an old plug by turning it backwards untit you feel it click in and then tighten...that sometimes works, but if they are bad , it will require a tap.
__________________
A Dalton
Reply With Quote
  #5  
Old 02-07-2009, 11:49 PM
Strife's Avatar
General Purpose Geek
 
Join Date: Apr 2004
Location: KY USA
Posts: 2,238
I would buy the tool (I have one, I use it to chase out the old anti-seize).oil the heck out of it, and operate it with your fingers ONLY a little at a time once you have it started right. A mistake here is very, very expensive. Take your time!
__________________
86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm
Reply With Quote
  #6  
Old 02-08-2009, 04:49 PM
Registered User
 
Join Date: Feb 2003
Location: Oklahoma
Posts: 1,025
Got it!

Tried the thread chaser first, but no luck. So I decided to tap it - slowly - with lots of oil and grease (to catch the debris) and it works fine now!

Thanks for the help.

ryan
__________________
RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE
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 09:02 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page