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)

Recommended Posts

Posted

Guys, I have been encountering some small backfiring issue with my 996tt (2002 tip) and the chief mechanic of the authorised dealer said it was the sticky hydraulic tappets which caused the backfiring. Accordingly, I have taken my car to them to have the tappets changed. My car has been with them for almost 2 weeks and yesterday I was told that my car is now encountering some engine compression loss (probably something is leaking after the change of the tappets). I mean how could this happen? Is this poor workmanship or what?

Actually I would like to ask (i) is it reasonable to take 2 weeks to change the tappets? (ii) what can cause the engine compression leak in this situation? Thanks in advance.

Posted (edited)

2 weeks is a long time, but you have to remember that the average Porsche mechanic has little experience working on the internals of the engine and they probably had to look in the book to see what a lifter was I assume this is warranty work?. They probably had to order parts too. Sounds like a valve is not sealing. Did they say that the leak was 1 cylinder or all?

Edited by 1999Porsche911
Posted

1999Porsche911, thanks for your quick response. Actually I wait until the parts have arrived before taking the car to the dealer. I reckon that they did not work on the car immediately when I took it in. They haven't said what causes the problem. All I know is that the chief mechanic will take a look at it. I am afraid that the tappets were changed by a junior mechanic and he may have forgotten to following the proper instructions in replacing the tappets (e.g. to pre-load the tappets first, etc.) Do you think the compression loss can be a serious problem?

Posted (edited)
1999Porsche911, thanks for your quick response. Actually I wait until the parts have arrived before taking the car to the dealer. I reckon that they did not work on the car immediately when I took it in. They haven't said what causes the problem. All I know is that the chief mechanic will take a look at it. I am afraid that the tappets were changed by a junior mechanic and he may have forgotten to following the proper instructions in replacing the tappets (e.g. to pre-load the tappets first, etc.) Do you think the compression loss can be a serious problem?

It is unlikely that it is a major problem. They'll have to take it apart again check the lifters. Keep the pressure on them. By the way. Do you live in a hotter climate and been using 0w40 oil? If so try going to at least a 5w50 in warm climates and this will help keep the lifters from cocking and jambing. Assuming that is what caused the lifter problem to begin with.

Edited by 1999Porsche911

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.