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3.2 Chains. Waste of a good Sunday.

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Old 03-30-2014, 02:14 PM   #1
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Default 3.2 Chains. Waste of a good Sunday.

Anyone been in this far? Tips for changing chains and resetting timing?

Need to replace a few bank one valves too....oddly, it's bent intake valves.

(Not my car BTW. Doing a favor for a friend.)

Click the image to open in full size.
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1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
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2003 GMC Yukon Denali XL (the anti-earth)
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Old 03-30-2014, 02:17 PM   #2
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Wider shot showing the fancy trans bracket I welded up for the trans jack.

Click the image to open in full size.
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Growing old is mandatory; growing up is optional.

2005 A6 Sedan Q 3.2 (wife's whip)
2003 S8 (Q Ship)
2000 A4 Avant Q 2.8 (daily driver)
1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)
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Old 03-30-2014, 02:19 PM   #3
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Quote:
Originally Posted by 4Driver4 View Post
Wider shot showing the fancy trans bracket I welded up for the trans jack.

Click the image to open in full size.
How did you flip the car upside down? Lol
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1 OF 1 IN THE UNITED STATES - 2015 A6 TDI Prestige with 19" Sports Package with Season Dedicated Tires - Oolong Gray Metalic, Nougat Brown Interior, Dark Brown Walnut Inlays, Black Headliner, Driver Assistance Package, Cold Weather Package, Night Vision Assistant with Pedestrian Detection. XPEL Ultimate. Summer Tires - Michelin Pilot Super Sport. Winter Tires - Michelin Pilot Alpin PA4, Eurocode Sway Bars and Links

RIP - 2005 A6 4.2 - (February 2005 - August 2014) (142,000 miles)

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Old 03-30-2014, 02:37 PM   #4
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It's levitating. ;-)
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Growing old is mandatory; growing up is optional.

2005 A6 Sedan Q 3.2 (wife's whip)
2003 S8 (Q Ship)
2000 A4 Avant Q 2.8 (daily driver)
1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)
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Old 03-30-2014, 04:24 PM   #5
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The dealer has my 4.2 for the chains right now. I am hoping that it is only the guides or the tensioners. I am sure the bill is going to be large. Just hoping that the chains are ok.
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1 OF 1 IN THE UNITED STATES - 2015 A6 TDI Prestige with 19" Sports Package with Season Dedicated Tires - Oolong Gray Metalic, Nougat Brown Interior, Dark Brown Walnut Inlays, Black Headliner, Driver Assistance Package, Cold Weather Package, Night Vision Assistant with Pedestrian Detection. XPEL Ultimate. Summer Tires - Michelin Pilot Super Sport. Winter Tires - Michelin Pilot Alpin PA4, Eurocode Sway Bars and Links

RIP - 2005 A6 4.2 - (February 2005 - August 2014) (142,000 miles)

C6 TSB Library link (Thanks to Dr. Cold for his help in setting this up) http://uberlame.com/a6_tsb/
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Old 03-30-2014, 04:57 PM   #6
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What was the problem the owner was having, and how many miles on it?
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Old 03-30-2014, 05:01 PM   #7
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I'm going to do all the chains and guides. Once you get this far, you may as well.

Car was noisy and ran poorly. Bank one cams were in time with each other, but out of time with everything else. Still need to pull the bank one head. Cylinder 1 fails leakdown.
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Growing old is mandatory; growing up is optional.

2005 A6 Sedan Q 3.2 (wife's whip)
2003 S8 (Q Ship)
2000 A4 Avant Q 2.8 (daily driver)
1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)
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Old 03-30-2014, 06:03 PM   #8
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Did you identify any failed parts in the chain guides or tensioners?
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Old 03-30-2014, 06:10 PM   #9
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Nothing obvious yet. The only thing I see is that the main chain tensioner piston retracts very easily. I need to get the oil pump chain off first, but my Bentley PC crashed and I'm not digging deeper without support.

Have I mentioned lately how much I hate Bentley Publishers? They tell you that you should only install on PC's that are stable so you don't risk content loss...but the newest operating system they support goes end of life in a week. Fan-f'ing-tastic.
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4Driver4

Growing old is mandatory; growing up is optional.

2005 A6 Sedan Q 3.2 (wife's whip)
2003 S8 (Q Ship)
2000 A4 Avant Q 2.8 (daily driver)
1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)
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Old 03-31-2014, 05:31 AM   #10
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Quote:
Originally Posted by KevinGary View Post
The dealer has my 4.2 for the chains right now. I am hoping that it is only the guides or the tensioners. I am sure the bill is going to be large. Just hoping that the chains are ok.

Kevin, when I see that your car also has the problem, I absolutely know that this is a failure in design, not maintenance.

What were the symptoms that made you take it to the dealer?

I finally have all the parts I need to complete mine, and was working on it this weekend. I have about $2000 in parts, including head gaskets, plus my labor. Sent the heads out for resurfacing, etc, new valve seals.

I'm hoping I'm good for another 175k miles, though.

Some of the parts have been redesigned or improved.

For what its worth, although I opted to replace the two upper chains, there was no evidence of stretching. It is the guides which fail, and sometimes the cam adjuster mechanisms.

Based on my non-scientific observation, the passenger side cam chain tensioner seems to be a weak point, as it sheds its plastic, ejecting it into the chain cog. I've noted at least 5 failures on various forums of that.

There will also be a cracked/broken lower guide, but that, I think, only causes the cold start 'rattle'.

Next is the adjusters, which have a locking pin, and the hole that the locking pin goes into gets elongated and then fails to lock.
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