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Old 08-10-2016, 09:42 PM
ngoma ngoma is offline
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Join Date: Nov 2009
Posts: 584
Default IP Timing

We've been needing an IP Timing sticky for some time. Here is my first draft quick'n'dirty, just some links to individual posts that give good info (mostly from v8volvo-- thanks!). Really needs to take the best from each and make a more readable prodecure, but for now, here they are:




"First start by taking the pump plug out and re-checking basic timing with the dial indicator again. You are sure you got the zeroing procedure right? I'm not familiar with your method -- it's not the one that I use. My method is to insert dial indicator before setting engine to TDC, then using a 27mm or 1-1/16" socket on the crank dampener bolt, rotate engine while watching dial indicator and go until the needle reaches its lowest point. Set your zero point there. Forget the 2mm setting. Then rotate by hand all the way around until you are approaching #1 TDC. (Your hint for this is by feeling/watching the back if the IP drive pulley, which has a notch in its rear flange. When the notch aligns with the marks at the outside of the IP and bracket, that is roughly #1 TDC, so as the pulley comes around and the notch nears that point, get ready to start watching through the bellhousing hole for the flywheel marks. Make sure you are reading the right flywheel mark as well -- it is not a notch, but a "0" marked into the flexplate, which can be tricky to see especially if there is a little surface rust on the flexplate rim.) As the notch approaches TDC, bring the flywheel slowly around until the 0 aligns with the pointer inside the bellhousing. Once it is there, look at the reading on the dial indicator. Anywhere in the neighborhood of .90-.98 will be a good reading. If you overshoot, you have to either back way, way off (greenbook says 1/4 turn but with an older, slightly sticky IP you need a lot more than that), or, as I do, just go all the way around again, 2 full crank rotations.

If your reading after measuring this way is off, then readjust static IP timing using method of loosening and turning rear cam pulley.

If your reading appears to be on after measuring this way, your next step is to set to #1 TDC and remove the vacuum pump from the cylinder head. This is the quick trick for figuring out whether the cam is at TDC or not without removing the valve cover. If the vacuum pump seems to be coming out under a lot of spring tension, even after you have wound its mounting nuts a significant way off, then you are timed 180 degrees off on the pump. If the vacuum pump is under slight spring tension as you first remove it but after loosening the nuts a bit, it sits loosely on its mounting studs, without tension from the drive rod pushing against it, then you were phased correctly. (The cam lobe that drives the vac pump is bottomed when the cam is at #1 TDC and at full height when the cam is 180 off #1 TDC -- a useful and clever move by the Audi engineers!)

If you find you are timed 180 off, you know what you have to do."

From http://d24t.com/showpost.php?p=5038&postcount=8

1985 744 gle d24t
1985 745 gle d24t
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