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DIY - A6 3.2 Upper Timing Chain Tensioner Replacement

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Old 08-18-2017, 06:53 AM
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Originally Posted by hrc4u
...after that swap the actuators
I got REALLY wonky values after doing this, initially. I think since I evacuated the oil from the recess ( since dirt inevitably got in ), it took a bit for the actuator pressure circuit to get back to baseline. I think if I ever pull the actuator again, I'll pour in clean oil, then evacuate what spills out as I re-insert the unit.

BOPOH: This is a 3.2-centric thread, I'd look elsewhere as we might do you harm by citing what's good for our engine. I believe if you search this thread, you can find those values, though.
Old 08-18-2017, 11:08 AM
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For thoose even thinking if possible to change the upper chains.. Nope...
Old 08-18-2017, 12:37 PM
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Tensioner out- your cam tools must have come!

Did you still have slack between the two sprockets once the cams were secured?
Old 08-18-2017, 06:58 PM
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Originally Posted by hrc4u
For thoose even thinking if possible to change the upper chains.. Nope...
Good job! Were you able to count the number of notches on the tensioner? Did it seem to be completely extended?
Old 08-18-2017, 09:40 PM
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Originally Posted by hrc4u
you could first start by swapping camshaft position sensor between banks (swap for instance intake sensors)...start her up...same values? or did they move with sensor?
after that swap the actuators ..same procedure as sensors..any difference?
i did like that but made no difference so thats why i'm now replacing atleast the tensioner to see what happens
/H
What type of failure would be indicated if the high readings move with a swap of the sensors? I guess the sensor itself could be in doubt, but given the chain rattle and the known issue on these engines, I wonder if that's worth doing.

I've been watching the edge motors video this morning and wondering if this is truly a job I can do myself. I've never pulled an engine apart and the tightening procedure including the final 90 degrees turn on the cam adjuster bolts scares me a bit. Not sure if I'm strong enough to do that, or if I can do it without slipping and f*cking up my engine.
Old 08-18-2017, 10:31 PM
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Originally Posted by ProstWest
The tip post.

Great thread- lots of really good tangents and collective wisdom.

My additions: I have a B7 A4. I was daunted by the crank pin access, but found that on my car, on 1 jackstand, wheel and undertray off and sway brackets dropped, it was pretty straightforward.

The timing cover fasteners, on the other hand, were at least as bad as others indicated. My advice: you are saving thousands of dollars on this job. Spend a few bucks to save hours, too. After using a 1/4 conventional socket to unsuccessfully hold bits on disassembly, I went on a spree before I had to put it together.

K-D/Gearwrench 1/4"drive/1/4"bit, locking angle flex head set. Not perfect, but greatly expanded acccess with both 1/4" drive and 1/4" bits.

A few longer power-dive bits greatly expand your access options.

3/8" socket to 1/4" bit.
You can go cheap on something similar, but I felt good using German engineering. It worked very well, opening up my full library of 3/8" drive extensions and ratchets with the torx bits above.


Ball drive torx bit for off-angle positive access. What a time to be alive, eh?

Sunex impact torx sockets. A lot of the access on the cam cover is shrouded, and the bulge in the timing cover crowds access with meaty bits, but these still proved handy here and there. Security were cheaper than conventional, for some reason. I also picked up a triple square set, but only really applicable for power driving the cam bolts in and out, after they are loose.

HF T-drive. The extra articulation mostly just got in the way, but helped a skosh here and there, before it gave me a brutal pinch. Straighten it out,
though, and cinch up all 24 cam cover t30s like a Joest team pro.


Take lots of hose and wire routing pix before you start. I throw unmissable lime green painter's tape labels on both sides of everything I disconnect.

The RTV is a huge pain. After one abortive attempt. I practiced the slide-and-roll-in motion like Mr Miyagi was standing over me, then only applied sealant to the parts I was sure I couldn't reach. Once I had it in ( and cleaned off the goo that still ended up getting dragged onto the wrong places-grr ) , I started threads in the two lowest holes to hold the cover, then finished the bead around the top section in place before setting it onto the mating surface.
Great post Prostwest. Quoted in full because I remember reading the thread at the time you posted this and saw your follow up saying your longer message went to new member moderation, but I never saw it appear at the time, so I guess it was OK'd and popped up in the thread some time later. Others likely missed it too.

Last edited by Sverige; 08-18-2017 at 10:36 PM.
Old 08-19-2017, 01:26 AM
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Originally Posted by ProstWest
Tensioner out- your cam tools must have come!

Did you still have slack between the two sprockets once the cams were secured?
not that much slack as before..
/H
Old 08-19-2017, 01:27 AM
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Originally Posted by mmthorn
Good job! Were you able to count the number of notches on the tensioner? Did it seem to be completely extended?
there arent any notches visible..im not shure if it was fully extended..i have pics of it i'm going to look at later.
/H
Old 08-19-2017, 01:31 AM
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Originally Posted by Sverige
What type of failure would be indicated if the high readings move with a swap of the sensors? I guess the sensor itself could be in doubt, but given the chain rattle and the known issue on these engines, I wonder if that's worth doing.
mm..yeah it's probably something elsa than the sensors/actuators..but just to rule them out...it's easy to swap them
/H
Old 08-19-2017, 01:36 AM
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at the moment i did one mistake yesterday when starting to put in the new tensioner....OF coz' one bolt slipped and fell down the abyss..will see if i'm screwed or if i manage to get it up somehow..crap..
(yeah i had rags when i loosened the old one..but then a friend came by and that somehow distracted me so i forgot the rag when starting assembly....)
/H


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