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PostPosted: Thu Apr 19, 2018 7:55 am 
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Joined: Tue Dec 11, 2012 8:56 am
Posts: 131
Location: London and NW England
The sort of noise that sounds like a low pitch version of an electric drill drilling into some metal !

My car has 356C running gear - disc brakes and 5J x15 wheels , grafted onto a '55 pre A , not sure about steering and suspension components . It does not get driven much in the UK winters as they put salt on the roads , but it was out yesterday for its first long drive ( 200 miles) since late Sep . about half the time it was on twisty country roads and after a while began to make that noise on the right hand turns , even with only a small deflection of the steering wheel .
Nothing on left hand turns. Nothing when running straight . Nothing on the gentler right hand turns of an expressway / motorway . Was doing reasonable speeds so would have been some loading resulting from the turning.

I will have to take it in to get repaired and was trying to anticipate what the problem might be , any thoughts ?

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PostPosted: Thu Apr 19, 2018 10:24 am 
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Location: Santa Barbara
It may be a tire rubbing on the fender due to one of the torsion bars stuck down. Try lifting up on the fender lip and see if the body pops up. Not sure about your setup but make sure you find and grease all the torsion tube fittings.
David


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PostPosted: Thu Apr 19, 2018 11:04 am 
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Location: SW Los Angeles
Also check to see if you have a wheel weight on the inside of the rim rubbing on something.

Mike

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Lomita, CA
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PostPosted: Thu Apr 19, 2018 1:47 pm 
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I would look at the wheel bearings first.

If it continues....3 left hand turns equals 1 right hand turn, no more noise. :P

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PostPosted: Thu Apr 19, 2018 2:11 pm 
356 Fan

Joined: Sat Mar 29, 2008 1:11 pm
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Location: Texas
Check the routing of the flexible hoses to the brake calipers. If they aren't properly routed they will rub on the tire in a turn. Please don't ask me how I know.

Jim Learmonth
Houston, TX

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PostPosted: Thu Apr 19, 2018 5:23 pm 
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Joined: Thu Feb 23, 2017 12:41 am
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Location: Radondo So Cal
Check rear 36mm axle nuts, 1 could be loose.


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PostPosted: Fri Apr 20, 2018 7:48 am 
356 Fan

Joined: Tue Dec 11, 2012 8:56 am
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Location: London and NW England
Thanks guys for the quick responses !
I suspect wheel bearing (s) .
Back in prehistory , about 1970 , I had a Super 90 that got a bent half shaft causing the rear wheel hub bearing on that side to fail , made similar noise......etched into long term memory !

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PostPosted: Sat Apr 21, 2018 5:15 pm 
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Location: Richmond, VA
Tag: Cooling with air
C J Murray wrote:
I would look at the wheel bearings first.

If it continues....3 left hand turns equals 1 right hand turn, no more noise. :P


Two wrongs don’t make a right but, three lefts do!

:D

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PostPosted: Wed Apr 25, 2018 10:59 am 
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Have you sorted out the ride height yet ?

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PostPosted: Wed Apr 25, 2018 12:49 pm 
356 Fan

Joined: Tue Dec 11, 2012 8:56 am
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Location: London and NW England
Mike Smith wrote:
Have you sorted out the ride height yet ?


..Er , no Mike ! The kids wont let me do it . Have got the 356 International coming up next week so focussed on getting it running well for that .

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PostPosted: Wed Apr 25, 2018 1:51 pm 
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I agree with Martin on this one. I had a similar sound when turning right only. After looking at several possible causes, it turned out to be a loose rear axel nut. Even though they are castellated nuts and have cotter pins, if they are the slightest bit loose and have movement in the axle splines, they will create excess movement and become loose. I was surprised at this as they are installed with an amazing amount of torque! (if installed correctly) If they have not worked too loose they can be re-torqued.
Cheers,
Rob
64 356 C Coupe

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PostPosted: Thu Apr 26, 2018 2:48 pm 
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The first thing I would check to see is if the brass fitting that attaches to the brake caliper has moved. This fitting must be an angle fitting not a straight fitting for the brake hose to position properly. If not correct his is a dangerous situation to have. al zim

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PostPosted: Fri Apr 27, 2018 9:29 am 
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If the axle nut gets a little loose after it was previously torqued to 385/400 ft.lbs., you'll have worn splines on both axle &/or drum allowing a
slight rotation between the two under acceleration and braking loads and will wear the drum's hub face (& shim) even w/the cotter pin in place.


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PostPosted: Wed May 02, 2018 5:15 am 
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Joined: Tue Dec 11, 2012 8:56 am
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Location: London and NW England
Well , I took the car in to Jaz Porsche here in sunny UK , run by Steve Winter . Steve has a 356SC and also a pre A that he is restoring , so he understands how these cars work.

Initial diagnosis was front LH wheel , noise disappears when brakes applied while making turn . On examination the pads were rubbing plus a bit of play on that bearing and a small bit of play on kingpin .

That was sorted out quickly , however test drive showed the noise still present on RH turns !

Further test drive with mechanic in passenger seat confirmed rear LH wheel was the source , and on examination the bearing and seal ring had gone , so also had transmission oil on the parking bake ( handbrake ) shoes.

So replaced both rear wheel bearings and seals plus one set of handbrake shoes . While chequebook was out also replaced the tyres , as discussed on a separate thread on this forum the date codes were pre year 2000 !
So instead of Michelin XWX 165/15 tyres all round with minimal grip , now have Pirelli Cinturato CA67s in same size and higher speed rating . These still look period but are 60% of the cost of the Michelins.

Car now fit for the ( European ) 356 International tomorrow in UK 8)

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PostPosted: Wed May 02, 2018 7:26 am 
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Location: 30MI WEST OF PHILA
Result! :D

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'57 Speedster - very real
'59 Sunroof - mostly real
'59 Coupe GT Clone Race Car - sorta real kinda
'60 Devin D Race Car-in process - fake chassis
'63 GS 2133 coupe - very real
'67 S Original Owner - ultra real


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