1st/reverse judder

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1st/reverse judder

Postby scotttie » 30 Apr 2019, 07:46

Hi everyone,

Posted this on the fb group, but thought I'd post it here as well. After a bit of advice... My syncro has a slight judder when pulling away in 1st or reverse. Reconditioned 2.1 was recently fitted and clutch was pretty much brand new so wasn’t replaced. Prop shaft is off, New engine mounts but I don’t know how old the gearbox mounts are... could worn gearbox mounts be the culprit? Is the best way to check them by jacking up the gearbox and looking for play?

Thanks,
Scott
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Re: 1st/reverse judder

Postby Aidan » 30 Apr 2019, 19:46

Gearbox mounts are pretty solid, but need to be assembled correctly
I'd be looking at driveshafts for a poor cv joint if it affects both 1st and reverse because they are quite different gears so the only common point is load from stationary
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Re: 1st/reverse judder

Postby scotttie » 02 May 2019, 08:11

Thanks for the reply Aidan! I'll take a look. Any tips for checking for a worn CV joint?
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Re: 1st/reverse judder

Postby Apex » 06 May 2019, 20:55

Hi,
Ive just had the same problem with my Green Doka, it turned out to be one nut missing from the Engine to Gearbox and another one lose. Also had a problem with the Distributor, when all the bolts were tightend the problem was gone, thank God
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Re: 1st/reverse judder

Postby scotttie » 09 May 2019, 07:40

Hi Apex,

Thanks for your reply, checked the engine to gearbox bolts last night and all are torqued up correctly. What was the problem you had with your distributor?
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Re: 1st/reverse judder

Postby scotttie » 09 May 2019, 15:45

Slight development, the judder only seems to happen when the engine reaches operating temperature. Not sure if this limits the possible causes?
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Re: 1st/reverse judder

Postby silverbullet » 09 May 2019, 18:17

Oil mist inside the bellhousing, caused by a weepy rear crank seal?
Can you pole a rag in the bellhousing breather hole and see if the black clutch dust is also wet with oil?
Assuming its not "Vanagon syndrome" aka kangarooing, which can be down to AFM track wear & temp 2 sender interaction iirc.
Never encountered it myself.

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Re: 1st/reverse judder

Postby scotttie » 20 May 2019, 09:07

So i've checked the engine to gearbox bolts and all are torqued up to spec. The judder is still lurking... but it is only present when feathering the clutch as the van pulls away in first or reverse. This is making me think it must be clutch related, either warped clutch or contamination. As soon as the clutch is fully engaged the judder is gone. I'm pretty confident it's not vanagon syndrome - AFM was recently put on a new track. I'll check for any signs of oil in the bell housing, but there are no drips coming from the housing or any signs of oil.

Thanks again for the advise everyone!
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Re: 1st/reverse judder

Postby HarryMann » 07 Jun 2019, 10:05

They can be a bit prone to it particularly in reverse. Rather than trace it down for yonks getting nowhere sometimes best just alter technique. Try if poss to engage clutch fully in one smooth movement and avoid playing it when maneouvring. If necessary G gear with care in car parks etc.
Probably clutch related possibly notchy wirn release fork. If you look in the Wiki it offers several suggestions.


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Re: 1st/reverse judder

Postby scotttie » 07 Jun 2019, 21:20

Thanks Harry. My sloppy clutch control could be part of the problem! I did have a look on the wiki but couldn't find anything on the topic. What section does it fall under?

Scott
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