Timing chain replacement
03-12-2009, 12:19 PM
#11
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Chain is forever. chain guides, on the other hand...
can fail earlier.
VR6 engines used plastic guides that failed around 100-120K miles. Have seen some posts about tensioner/guides failing on the B6 4.2L engine at 100K miles or so.<ul><li><a href="http://www.audizine.com/forum/showthread.php?t=246077&highlight=chain+guide" >Link</a></li></ul>
VR6 engines used plastic guides that failed around 100-120K miles. Have seen some posts about tensioner/guides failing on the B6 4.2L engine at 100K miles or so.<ul><li><a href="http://www.audizine.com/forum/showthread.php?t=246077&highlight=chain+guide" >Link</a></li></ul>
03-12-2009, 03:33 PM
#12
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Ok read this post. Nice pics BTW.
<ul><li><a href="http://audizine.com/forum/showthread.php?t=246077&highlight=tensioner">h ttp://audizine.com/forum/showthread.php?t=246077&highlight=tensioner</a</li></ul>
03-12-2009, 05:16 PM
#14
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The post by VF on that thread doesn't look too "speculative" to me
Neither does the later post by the tech about the W8 engine and the A8 belt-drive version of the 4.2 engine.
Given that some 2004 B6s are approaching more than 100K miles, we should find out soon enough.
If I were doing a clutch or had the engine out for some other reason I would change those guides at that time anyways, given the past history of VW/Audi plastic timing chain guides.
Given that some 2004 B6s are approaching more than 100K miles, we should find out soon enough.
If I were doing a clutch or had the engine out for some other reason I would change those guides at that time anyways, given the past history of VW/Audi plastic timing chain guides.
03-12-2009, 05:27 PM
#15
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They did not make specifics on mileage or anything to the 4.2 motor.
But made comment that you MIGHT see issue with the guide.
This is known and some people have had issue already, even at under 50K miles. But this is not the norm and has only occurred to a select few.
This is no cause for a blanket statement that you'll <b>need</b> to have this done around 100K.
This is known and some people have had issue already, even at under 50K miles. But this is not the norm and has only occurred to a select few.
This is no cause for a blanket statement that you'll <b>need</b> to have this done around 100K.
03-12-2009, 05:35 PM
#17
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Plastic chain guides on VAG engines fail at 100K or so miles. . .
is there some reason to believe the S4 engine will be any different? Uber-plastic maybe?
Or just wishful thinking. . . ?
Or just wishful thinking. . . ?
03-12-2009, 05:39 PM
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And don't forget the 105K TB recommended replacement on the 1.8T motors
Which ended up being a 60K maintenance item and cost VW and Audi million$ in class-action settlements and owners about $3K to repair when not covered by warranty.
03-13-2009, 06:38 AM
#20
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I don't consider 100-125K miles to be a premature failure
but you'll have to ask VAG why they continue to use plastic timing chain guides after making engines for close to 15 years that experience this issue.
Yes, in many ways a time belt may be better. At least it is accepted that a belt will fail, so it is not put in a place that requires you pull the engine to replace (versus a chain). On the 1.8T the belt and related hardware are replaced at 60K miles or so at a cost of about $700-1000.
Yes, in many ways a time belt may be better. At least it is accepted that a belt will fail, so it is not put in a place that requires you pull the engine to replace (versus a chain). On the 1.8T the belt and related hardware are replaced at 60K miles or so at a cost of about $700-1000.
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