Mystery syncro front end noise

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Mystery syncro front end noise

Postby garyd » 12 Apr 2019, 16:21

Hi,
I wonder if anyone's experience can help me identify the likely source of a mystery noise, please?

First off, this is a syncro which was a factory TD and now runs a GTi petrol engine.

When I leave home I have around 100m of potholed track before reaching 'reasonable' tarmac. As I trundle out on idle in 1st gear there is an irregular hollow knocking sound that could be related to movement going in & out of the potholes. From the driver's seat it sounds to be under the front and possibly from the nearside.

Once it gathers speed on tarmac the noise is no longer audible, possibly lost in the background noise (AT tyres, etc) or maybe not present due to smoother surface. The sound quality makes me think of hollow castings, like the front diff casing. There is no excessive play here and oil is up to level and fairly new (75w/90).

I have removed the front prop but this has made no detectable difference. I have also checked everything I can find around the front suspension but can find no looseness or unexpected movement.

Any suggestions as to what it might be?
Thanks
Garyd

1990 Transporter syncro camper
2 litre AGG 'GTi' engine
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Re: Mystery syncro front end noise

Postby mshaw1980 » 12 Apr 2019, 16:35

I had a rattling like this and it was the steering bevel box. Took it off and opened it up to clean out old grease. Repacked with new grease and all was cured, well it highlighted another squeak I need to deal with :D
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Re: Mystery syncro front end noise

Postby lloydy » 12 Apr 2019, 16:40

Bottom bushes on droplinks possibly?
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Re: Mystery syncro front end noise

Postby silverbullet » 12 Apr 2019, 18:23

Had a broken retaining clip on one corner of the front grille. Took ages to find the source of the mystery irregular, wooden "toc toc"

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Re: Mystery syncro front end noise

Postby dave friday » 12 Apr 2019, 22:06

Wishbone bushes? I have to drive on a dry river bed (rambla ) to get on the Tarmac road ,my van made quite a racket on the rambla but quiet on the tarmac,both bushes had collapsed !
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Re: Mystery syncro front end noise

Postby toomanytoys » 13 Apr 2019, 07:41

Double check lower ball joint. Jack so front wheel just off ground and put a crow bar under tyre and lift. Put a finger between the lower arm and upright to feel play.. These make a “Dok, Dok ” sound just as you describe and can’t be heard at higher speeds..

Other one could be the ARB mount on chassis. But wear would be obvious.
Or as Ian says. Could be something silly moving.
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Re: Mystery syncro front end noise

Postby garyd » 13 Apr 2019, 14:05

Thanks for the suggestions, guys.

Most, if not all, of the front suspension bushes are relatively new and the top ball joints as well. The only ones not replaced in my ownership (10 years?) are the lower ball joints. I have tried to check these but I will get assistance and use the method suggested by Simon (TMT).
Garyd

1990 Transporter syncro camper
2 litre AGG 'GTi' engine
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Re: Mystery syncro front end noise

Postby garyd » 13 Apr 2019, 15:22

Looks like Simon was right. I do have detectable vertical movement when the wheel is lifted as he suggested.

Presumably any movement here is a sign of wear - or do new joints also have some play?

It would appear to be a significant amount of work to extract the lower arm from everything else and then it presumably needs a fairly hefty press to drive the ball joint out and a new one in?
thanks
Garyd

1990 Transporter syncro camper
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Re: Mystery syncro front end noise

Postby toomanytoys » 14 Apr 2019, 11:01

Should be no play...
if you can live with it for a bit. They will be fine. Think sprinters are allowed 3 or 4mm of play for mot, so a friendly mot man may allow a small amount as an advisory.
Yes. Needs a good press to change it.
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Re: Mystery syncro front end noise

Postby Simon Baxter » 16 Apr 2019, 00:31

Front to rear coolant pipes, front clip missing?
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Re: Mystery syncro front end noise

Postby garyd » 30 Apr 2019, 16:43

Can anyone point me to dimensions for the press 'tools' required to press these bottom joints out and in, please? I am assuming that they need to be thick-walled tubes of different diameters.
Garyd

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Re: Mystery syncro front end noise

Postby silverbullet » 30 Apr 2019, 19:38

I am holding DSM's balljoint and front wheel bearing tools. I have added a modified bearing outer race to the kit, it proved useful for changing the lower bj.
You'll still need some odds n sods when its all under the press, but these bits get you over the hurdles.

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Re: Mystery syncro front end noise

Postby DSM » 01 May 2019, 11:44

Hi Gary,
these were donated for any club member to use FOC as long as they are returned to a central contact such as Ian (if he doesn't mind). You will need access to a 10 Ton press though.
Regards Duncan. :ok
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