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#1 Trying to identify what this spring is for

Posted: Mon May 04, 2020 4:51 pm
by Philk
On both my car and the picture in factory fit of car 881640, there is a spring present in the metal housing for the brake master cylinders (see highlighted picture below). However, there is no reference to the spring in the June 1963 J30 Parts Catalogue (see plate 26 below). Can someone please shed some light on what the purpose of the spring is and, additionally, where the bottom of it should mount to?

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Spring highlighted in red

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J30 Spare Parts Catalogue - no spring shown

#2 Re: Trying to identify what this spring is for

Posted: Mon May 04, 2020 5:22 pm
by tinworm
Its an addition ? my '61 did not have it.

Barrie

#3 Re: Trying to identify what this spring is for

Posted: Mon May 04, 2020 10:21 pm
by splosh
I have seen this before and now trying to remember.
I am sure it was a modification for the brake pedal return. ?? Possibly a service mod.

#4 Re: Trying to identify what this spring is for

Posted: Mon May 04, 2020 10:24 pm
by splosh
I was right...... found it here.... back in 2015
viewtopic.php?t=6936

#5 Re: Trying to identify what this spring is for

Posted: Tue May 05, 2020 12:34 am
by abowie
It's there on both my 3.8s.

It's a return spring for the lever so it doesn't press in the little valve and also acts to secure the castellated nut.

#6 Re: Trying to identify what this spring is for

Posted: Tue May 05, 2020 10:24 am
by Philk
splosh wrote:
Mon May 04, 2020 10:24 pm
I was right...... found it here.... back in 2015
viewtopic.php?t=6936
That is great. Thank you. Before my time on the forum and this had not come up on my searches.

I recently had sight of a pretty original 3.8 undergoing maintenance and took a few photos. The picture below shows the spring is present (top right hand corner of photo), and from the car's dated Dunlop Master Cylinder tags, it was built after May 1962.

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#7 Re: Trying to identify what this spring is for

Posted: Thu May 07, 2020 6:46 pm
by ysmalkie
It was on my '63 car:


Image


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I am not sure though if it's the original mount place.

Tadek

#8 Re: Trying to identify what this spring is for

Posted: Thu May 07, 2020 7:34 pm
by ralphr1780
I have the same spring on mine too, built Oct 62.