Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Engine oil leak help

Recommended Posts

For years now (5+), I have a small oil leak on my MY02 996TT Tip. Oddly enough, It has actually improved after I replaced the engine mounts (were and are Porsche originals) and the transmission support, also with a Porsche original.

I say the leak improved because I used to find drops oil on my garage floor and they were getting larger. After I replaced the above, they stopped...

Anyway, I'd like to take care of this, thus I'm posting a photo, hoping to get some clues of what should I be looking for, what is the most likely culprit considering where the oil shows up and what should I do to positively identify the source.

It clearly comes from the left side of the car, somewhere above on the rear side of the engine. What is there that can cause this?


Edited by laalves
Link to comment
Share on other sites

After looking at the engine a bit more carefully, it appears it is the timing chain tensioner bolt that is actually visible in the photo. I was thinking it was coming from higher above but it looks like that bolt is the culprit. Looking at the parts catalog, I can identify it but can't see any o-ring. It looks like it has a crush washer rather than an o-ring though, unless there's one in a flange recess. 

In 911uk.com, another fellow has the same but does not know the procedure to change this. Looking at the manual, all the mention is taking the complete assembly apart, engine removed. It would appear the camshafts would have to be locked.

I'm tempted to check the torque (the manual says 25Nm) but I won't until I learn more, camshafts are not the sort of thing I like to touch without knowing exactly what I'm doing and its consequences. Off course, torque check would only slow the leak, at best, if anything.

In the parts catalog, it is item 13 of illustration 103-15, P/N 993 105 275 52. It says "Information available", i.e, there is a related TSB. Anybody knows anything about this?
 Any idea on how to replace this part as I suppose the tensioner shaft and/or camshafts must be locked in position?

Edited by laalves
Link to comment
Share on other sites

  • 2 weeks later...

As a quick update, I tightened the bolt by 90º and cleaned the engine bottom with brake cleaner. 300km later it's still clean. I don't believe in miracle cures so I guess this is only a temporary fix but it is working for the moment.

Link to comment
Share on other sites

  • 2 months later...

Another update, there is another, smaller leak, more like a sweat. It's coming from the right side and is inaccessible due to the water pump manifold. To have a go at this, would require quite a bit of disassembly so I guess I will live with this, unless it does get worse. Or maybe with thin locking-pliers I would manage to give the bolt a quarter turn as another stop-gap measure, not best practice, I know but perhaps better than leaving it as it is? Any views?


I changed the oil last week and changed from Mobil 1 0w40 to 5w50 which is more suited to my climate anyhow and maybe (a small maybe) the higher viscosity might also help a little bit with slowing down the progress.


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.