Hey guys after my motor tear-down post and many months since then Ive been contacted by many a member with issues and pictures of there motor and its issues.
This thread is for anyone that had to replace a motor for any issue. Please PM me or feel free to post or E mail me. [email protected].
What I hope to do is help find and expose the issues, miles and damage that we are subject to. In my findings Ive came up with some serious, serious finds.
We are going to dispel one more myth right here today. At this point the weakest point in your motor...... IS YOUR PISTONS. That's right your pistons. Its not the rods its the pistons. Ive seen two motors with broken rods. They were both stock with bad cylinder wall scoring. You can see where the piston was binding up and then the rod just let go.
If your building your motor for power and you don't change your pistons your wasting your time. Even though we have strong rods it would be foolish to not get both new rods and pistons. The rods are strong but they have to kneck down to fit the stock piston. A new rod and piston combo would solve the weak rod and piston issue.
We all have read about issues with cylinder wall scorching?? what do you think is doing that? Its the skirt of the piston expanding too much. Ive seen it on several motors. Piston swell is nothing new and if you had cylinder wall scoring you might have witnessed it first hand.
So with that being said I would like to start a log of people here that have had motor issues. Serious motor issues. Please Feel free to post pictures and share stories.
Before reading below, please keep in mind the following. Some if these issues may have been from improper service by the owner. There are THOUSANDS and THOUSANDS (looking to get finnal production numbers) Of B6/B7 S4's and the largest collection of them are on this site so this may seem like alot but its a small fraction of the issues colllected into one area.
We can add a category if needed but the starting list looks like this.
Cylinder wall scoring or weak compression
04/ 3
05/ 7
06+4
Cylinder head damage / dropped valve / valve stem leak
04/ 4
05/ 4
06+
Lost piston / motor debris
04/ 2
05/ 5
06+
Bad cam tensioner/follower or adjuster
04/ 6
05/ 2
06+
Broken timing chain or guide
04/ 5
05/ 4
06+
Broken rod
04/4
05/ 2
06+3
This is a quick list Im looking through my notes for more causes. PLEASE feel free to share and I don't like to sticky my own work but if this gets going and you guys want it let me know we can put this up top for all to see.
Post still in the works.....
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