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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014)

VW MKVI-A6 Golf family including Jetta SportWagen (~ 2010-2014) Discussions area for A6/MkVI (2010-2014) Golf and Golf Wagons (Jetta Sportwagon in the USA).

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Old December 15th, 2011, 09:51   #1
USCGChips
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Default 2.0 TDI timing chain

I was at the dealership the other week inquiring about a 2012 Jetta Sportwagen. The sales person there mentioned in mid 2012, the TDI is supposed to get a timing chain vice the belt. Anyone heard this news ?
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Old December 16th, 2011, 14:40   #2
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I haven't heard but if it's anything like the chains they use on the 2.5 gasser, the chain that drives the oil pump/b/s on the 04-05 Passat, I think I'll be happy I have a belt.
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Old December 16th, 2011, 14:47   #3
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nothing wrong with a belt, as long as you change it out on schedule..
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Old December 16th, 2011, 14:49   #4
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I hope they don't give the TDI a chain... they are finally once again 100% chain-free on the 4 cylinders sold here. Belts are SO much better on Volkswagens.
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Old December 16th, 2011, 16:38   #5
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Has the 2.0T gone back to a belt???
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Old December 19th, 2011, 11:37   #6
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Quote:
Originally Posted by GoFaster View Post
Has the 2.0T gone back to a belt???
No.

And a properly designed chain is much better than a belt. That requires a $1200 service every 100k miles.
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Old December 19th, 2011, 12:26   #7
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yeah but how much does it cost to replace a chain, at what miles?
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Old December 19th, 2011, 12:51   #8
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yeah but how much does it cost to replace a chain, at what miles?
A properly designed chain NEVER requires replacement.

The one on my crown vic is at 300k miles and perfectly fine.
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Old December 19th, 2011, 13:06   #9
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Quote:
Originally Posted by maxedtdi View Post
No.

And a properly designed chain is much better than a belt. That requires a $1200 service every 100k miles.

I disagree, but even then, VAG has never really "properly designed" a chain drive, so.... And it should not be costing anyone $1200 to service even the MOST expensive TDI timing belt.
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Old December 19th, 2011, 19:53   #10
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Quote:
Originally Posted by oilhammer View Post
I disagree, but even then, VAG has never really "properly designed" a chain drive, so.... And it should not be costing anyone $1200 to service even the MOST expensive TDI timing belt.

I agree with you on the chain. I had a B7S4... talk about ticking timebomb of a chain. That said, around here $1200 is downright reasonable for a timing service at an indie. Dealerships....
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Old December 19th, 2011, 19:57   #11
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Quote:
Originally Posted by maxedtdi View Post
A properly designed chain NEVER requires replacement...
rubbish.
Ask anyone with an MB diesel. Standard interval is 200K mi for these.
I think the chain in an overhead cam engine is stressed more than OHV (like your crown vic)
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Old December 19th, 2011, 20:57   #12
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My 87 4runner (22re) needed a new chain at 135K. Also needed new nonplastic chain guides. Poor chain guide's original design. Chain slack/stretch & guide failure would allow the chains to cut into the front end covers.
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Old December 19th, 2011, 21:09   #13
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Quote:
Originally Posted by tditom View Post
rubbish.
Ask anyone with an MB diesel. Standard interval is 200K mi for these.
I think the chain in an overhead cam engine is stressed more than OHV (like your crown vic)
I've owned 2 MB diesels with 275k (11 years) and 260k (10 years), one gas MB (14 years) and one Nissan (15 years) with over 200k miles each plus many other vehicles with chains with over 100k miles and never had an issue with chains or guides. I'll take a chain anyday rather than paying for what say 20 timing belt services.
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Old December 19th, 2011, 21:34   #14
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The chains stretch, so especially in the injection pump MB's, you get a slow degradation in performance over time. Think about it- you're completely reliant on the mechanical timing of the pump firing in relation to piston position.

I suppose a modern engine could compensate for the chain stretch for a much longer period of time, but chains DO need replacement, just like belts. Maybe 2x as long, but not 20x.
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Old December 19th, 2011, 23:45   #15
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Yes chains stretch, but I believe my 123 and 126 MBs had a double link chains while I'm fairly certain my old Nissan only had a single link chain. All were driven mostly highway miles. So, with proper oil change intervals, double chain, and highway miles, stretching is generally not an issue at 200k miles.

I remember back in the mid '80s and then again in the early '90s when I had the injectors rebuilt in the MB diesels (around 150k+- miles IIRC), I asked the shop that did the rebuild about replacing the chain and they indicated they have seen them last 300k- 400k miles. I had the about 4 inch think MB engine repair manual for the 126 300SD + 4 other MB manuals (paid about $90 for all five new in the '80s) and checked the chain stretch and don't recall the exact degrees of stretch but I don't believe the chain was stretched anymore than a few degrees when I sold them. I don't recall what the tolerance was for stretch but I'd say maybe 8-10 degrees before the chain should be replaced. I seem to remember adjusting the timing of the pumps occasionally and also getting an offset key for one of the MB to alter the cam timing.

So, I'd say early timing belts were 80k miles CI and dual link timing chains are more like 300k+ miles CI. That's more like 4X. But, I guess my point is most people don't keep a car long enough to have to worry about a timing chain replacement (whether that be 2X or more) like they do a timing belt replacement every 100k miles or so with associated costs between say $500 - $1000.

My current 2008 Nissan has 108k miles on it and I don't have to spend any $ on a timing belt replacement. And given that it's likely to be driven less than 6k miles a year now for the next 8-10 years or so, I'll never have a timing chain replacement.

And as an aside before I get asked whether I want to sell the MB manuals, I sold the engine manual around year 2000+ for $125 on ebay to a fellow in Brazil and the other manuals for about $100 total to a lady on ebay that bought and resold repair manuals.
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