View Full Version : Almost time for timing belt change


corne
04-10-2008, 10:45 PM
I have a potentially huge problem. How far cab the cams be out in accordance with the crank?

I only have the tool holding the cams in a straight line and the right bank must've missed a tooth because they dont line up, but when they are in a straight line with the vag tool, the #1 piston is not TDC (I took out #1 plug and checked with a tool to get the cylinder TDC, then the cam blades(don't know a better word) are at a 11, 5 o'clock position, try as I might I can't get TDC with a in line cam, also the lower pulley is of no help because the marks on the pulley is also at a 2ish o'clock mark not the 1 o'clock mark it should be(according to my knowledge)

Any help for this noob at changing TB belts?

Oh yes I got the numbet of my tranny mounts according to Audi South Africa it is * 4A0 399 151K. $175 how much are they there?

A6Gary
04-10-2008, 10:55 PM
It means that the crank is at the position to correctly install the TB. IIRC, TDC means that #3 cylinder is actually at the TDC center. But again, it doesn't matter since you are installing the TB as designed by the Audi design engineers (assuming that you loosen the cam sprockest to spin freely as you tighten the belt).

corne
04-10-2008, 11:57 PM
Ok I understand that actually cylinder 3 is tdc, but why would I want to loosen the cam sprockets and how do I align them again because I definitely think the car skipped a tooth, could that also cause my problem of a light misfire at idle and all the way to 2k rpm and also the excessive exhaust pressure?

And Where do you slack the tention of the timing belt?

4Driver4
04-11-2008, 04:09 AM
If, for some reason, you can't or won't use the locking pin, there is a mark on the harmonic balancer that lines up with a small arrow on the lower cover when the engine is in the right spot.

Your situation with the cam illustrates how important it is to use the tools to do the job right.

corne
04-11-2008, 04:46 AM
1st tool is almost done (just waiting for the pins on the tool that locks the cams in place)

Dave was kind enough to dend me pics of both the tools so my dad is busy with the crank tool today, so by next week that will be ready and I could do the timing belt.

Could a skipped tooth do all the stuff I posted in the previous post?

4Driver4
04-11-2008, 05:16 AM
...along with the belt and rollers, right?

DaveInSaltLake
04-11-2008, 06:03 AM
drill a hole for them, slide them in, spot weld the head on the back side.

DaveInSaltLake
04-11-2008, 08:15 AM
<img src="http://i47.photobucket.com/albums/f174/DavesData2/1996%20A6Q%20Pearl/Timing%20Belt/DSCN4636-1.jpg" border="0" alt="Photobucket">

You'll notice that the bolt holding it on is NOT thru the center. Rotating the tensioner around the off-center bolt creates tension on the timing belt.

You'll also notice the cam sprockets/gears are off, lying on the floor. This is crucial for getting the timing set right.

Please replace the serpentine belt tensioner, too. It's not uncommon for a broken serp belt to wreck the timing belt...and thus cause bent valves.

Orlando 4000S
04-11-2008, 09:13 AM

DaveInSaltLake
04-11-2008, 01:13 PM

4Driver4
04-11-2008, 06:22 PM

corne
04-12-2008, 08:54 AM
Hopefully I won't f*&amp;K up. Why do the cam sprockets have to come off to set the timing? Thought you could just lift the belp up from their position and turn the sprocket a teeth at a time to align the cam sprockets, considering mine skipped a tooth...

corne
04-12-2008, 08:58 AM
much cheaper and readily available, only the cam belt tentioner bearing I will have to buy from Audi

corne
04-12-2008, 09:00 AM
strong enough to withstand the torque you put on them?