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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old June 12th, 2019, 07:52   #1
Coasty
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Default What now? Timing Belt Problem

So my beloved VW had a major malfunction this morning. Pulling out of the driveway I heard a horrendous bearing type sound, then a "flub flub", battery light comes on, then a bang, engine stops. Open the hood, accessory belt had come off, took a look at the timing belt and its very loose, as if it skipped off the tensioner. Had to borrow the wife's Tahoe to get to work, so I have all day to think about what to do here. Whats my first move? I've had this car for 12 years or so, timing belt was done about 80k miles ago by a trusted VW mechanic, so I've not delved too much into the timing aside from when I adjusted it on the pump a few months ago when it got out of whack. Of course i'm expecting internal damage/contact, although I was at idle so hopefully its not too bad.
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Old June 12th, 2019, 08:04   #2
Nero Morg
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Knock on wood, hope a head isn't in your near future.. You'll find out as soon as you take the valve cover off.
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Old June 12th, 2019, 08:35   #3
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you need a head, and timing belt and lots of work ahead of you
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Old June 12th, 2019, 10:32   #4
Mike_04GolfTDI
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Something that would affect both the timing belt and the accessory belt sounds kind of worrisome.

I suspect maybe something went wrong with your crank sprocket. Like if the center bolt was loose and it fell off.

With the sounds you describe, it seems plausible.
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Old June 12th, 2019, 11:54   #5
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12 year old belt.....12 year old parts.
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Old June 12th, 2019, 13:17   #6
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Possibilities include the front sprocket coming off (the crank!) which is very bad, although it's also possible the serpentine belt came off and the flying part got into the timing area. It's happened to people before with catastrophic results.

Best case you're into this for head rework; worst case, if the front pulley came off, you may be hosed if the nose of the crank is damaged since it's probably easier to source an engine and put it in wholesale than to tear the existing one apart and either replace the crank or have it reworked PLUS re-do the head.
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Old June 12th, 2019, 15:14   #7
BobnOH
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Big question is did the valves hit the pistons and how hard. Not much we can interweb help with. Nothing for it but to open it up and look.
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Old June 12th, 2019, 17:08   #8
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you do know that 80K is the service life of that belt, but only 5 years MAX, not 12.
you get what you neglect for
Anyways, yea, your looking at a total upper engine rebuild and possibly pistons, worst case, yes, total engine loss down to the crank.
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Old June 12th, 2019, 17:14   #9
jettawreck
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How did the timing come to be "out of whack" a while ago?? Timing just doesn't change randomly unless something came loose.
First thing to do is remove the valve cover and very carefully inspect the lifters (especially exhaust) for spider web type cracks, broken tops, etc. Easier to do/see with cam removed.
Highly recommend the services of "Franko6" for any almost certain head repairs.
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Old June 12th, 2019, 17:20   #10
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Quote:
Originally Posted by Mongler98 View Post
you do know that 80K is the service life of that belt, but only 5 years MAX, not 12.
you get what you neglect for
Quote:
Originally Posted by Coasty View Post
I've had this car for 12 years or so, timing belt was done about 80k miles ago by a trusted VW mechanic

Did you even read the OP's post before accusing him of neglect?
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Old June 12th, 2019, 18:01   #11
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Quote:
Originally Posted by P2B View Post
Did you even read the OP's post before accusing him of neglect?
To be fair, OP didn't say how long ago the belt was done, just how many miles ago. I would hope it was before then. We'll have to wait patiently until he responds.
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Old June 13th, 2019, 09:55   #12
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Quote:
Originally Posted by Nero Morg View Post
To be fair, OP didn't say how long ago the belt was done, just how many miles ago. I would hope it was before then. We'll have to wait patiently until he responds.

I was in the same position. I thought it was done 12 years and 80K ago on my first read of his post.
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Old Yesterday, 15:01   #13
Mike_04GolfTDI
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So what kind of Toyota are you getting?
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