UKSaabs

THE site for UK Saab people!
It is currently Thu Sep 20, 2018 4:45 pm

All times are UTC



Forum rules


IMPORTANT INFORMATION FOR NEW TOPIC TITLES
For Workshop questions, please include year, model and a brief description of the issue in the thread title (in order to assist others to assist you),
This forum is not to be used to advertise items for sale or for items wanted, please use the classifieds for such posts.



Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: Fri Jun 08, 2018 6:02 pm 
Offline
Active user

Joined: Mon Apr 14, 2014 9:54 pm
Posts: 34
Car Model: C900 T16S
I've been losing oil - the sump plug was leaking.

I tried to tighten it - it was not quite finger loose, but lose enough to leak. Turns out the sump threads are gone (when I took the bolt out, a helicoil from what I presume was a previous repair came out with it).

So i now had a sump hole that wont take a stock sump plug and i'm looking at my options (that dont involve a can of petrol and a match).

Would there be any problem with me tapping the hole to take a larger diameter sump plug? That being the case, what is the stock size for the stock plug size, and how much bigger should I go (bearing in mind its already a larger hole now the helicoil has gone)?

I could helicoil again, but given this has failed once already (and i've read elsewhere that helicoils aren't really suited for bolts that are in and out all the time), I would probably need to go up a size again to get it to fit snug, so stock plugs probably arent an option going forwrd anyway. I'm also concerned about recovering the snap-off helicoil tang from inside the sump once its fitted, and the damage it could cause if iim unable to recover it by flushing with cheap oil...

Any advice appreciated!

Thanks


Top
 Profile  
 
PostPosted: Fri Jun 08, 2018 8:47 pm 
Offline
Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 479
I think the sump plug thread was heli coiled from original.
I believe the thread is M14x1.5 but check first!
Wurth timesert would be the ideal repair as they use a threaded sleeve rather than a coil insert so the tapping size for the insert is larger than a standard helicoil thread.
https://eshop.wuerth.de/Oil-drain-plug- ... en/US/EUR/

Not much to lose by trying another M14x1.5 helicoil in there if the threads look OK.
If you use an insert longer than the length of the sump plug you can leave the tang on, not ideal but not really a problem.

Check very carefully that the boss for the sump plug is not cracked. Some gearboxes casings had a problem and the drain hole was offset in the boss leaving it very weak on one side and prone to cracking if overtightened.


Top
 Profile  
 
PostPosted: Fri Jun 08, 2018 9:48 pm 
Offline
Active user

Joined: Mon Apr 14, 2014 9:54 pm
Posts: 34
Car Model: C900 T16S
aw naw :wall: :wall: :wall: :haynes:


Attachments:
crack.jpg
crack.jpg [ 119.38 KiB | Viewed 409 times ]
Top
 Profile  
 
PostPosted: Sat Jun 09, 2018 8:55 pm 
Offline
Light Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 479
Sorry you had to find that.
Ideally that needs a weld repair, re-thread and new insert.
Could be done in situ but not an easy job.
Suggest you have a word with your nearest Saab specialist, they must have had to deal with this before and will hopefully be able to suggest a viable solution. Alternatively have a word with someone that can weld ally and see if they will take it on.

The plugs have a 13mm hex in the hope that they will only be tightened to a torque relevant to a fixing with that size hex.
Unfortunately some people do like to hang on them with a 3ft long knuckle bar!


Top
 Profile  
 
PostPosted: Mon Jun 11, 2018 6:13 pm 
Offline
Saab Nut

Joined: Thu Nov 11, 2010 12:26 pm
Posts: 1586
I would think to get a proper repair its a take the lot out job and split the engine from the box. If are doing this its worth checking things like the timing chain, replace head gasket and fix any gearbox problems.

I wouldn't want to try welding that, filling the engine sump with rubbish and it probably wont repair very well with oil in the crack. You would have to grind the crack out and weld from both sides otherwise it will just crack again. Only thing I can think of it cleaning it up and get some die penetrant spray and see where it goes. If its not gone the full width of the boss you could enlarge the hole and screw in an insert or weld a boss on top of the boss you have i.e. a thick alloy boss welded with a fillet weld around the edge on top of what you have. You still risk crud getting in the sump. Good luck.


Top
 Profile  
 
PostPosted: Tue Jun 12, 2018 9:09 pm 
Offline
Light Pressure Turbo

Joined: Mon Nov 16, 2009 10:03 pm
Posts: 508
Location: NORWICH
Car Model: 900 t16s, 93 viggen vert
Yes, I would say it would need a proper repair, or another gearbox, either way it's an engine out job,
Or if you don't fancy it sell the car on I'm sure you could find a home for it on here,
Or perhaps some of that plumbers ptfe thread sealing tape would do as a temporary short term fix ?
could be worth a try at least. good luck


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group

follow UKSaabs on Twitter



UKSaabs silhouette logo images by Mark Green www.greenphotos.com
"subsilver2" slightly bodged by UKSaabs for our own use.

:: Disclaimer ::
Comments posted here are the views of their individual authors and are not necessarily shared by the owners of this Web site.
Authors assume all responsibility for comments posted here.

UKSaabs The biggest and best privately owned UK based independent Saab forum for all SAAB enthusiasts.
Whilst we encourage our users to support our advertisers the site wishes to remain independent and therefore does not endorse any particular advertiser(s)
UKSaabs is not affiliated with Saab Cars UK or Saab Automobile AB