Trying to identify what this spring is for

Technical advice Q&A
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Philk
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#1 Trying to identify what this spring is for

Post by Philk » Mon May 04, 2020 4:51 pm

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?

Image
Spring highlighted in red

Image
J30 Spare Parts Catalogue - no spring shown
Phil
1964 S1 3.8 OTS

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

Post by tinworm » Mon May 04, 2020 5:22 pm

Its an addition ? my '61 did not have it.

Barrie
1968 E-type roadster, 1964 E-type fixed head 1995 Ferrari 355 1980 Ferrari 308 1987 V8 90 Landrover 1988 Bedford rascal van 1943 Ford GPW

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

Post by splosh » Mon May 04, 2020 10:21 pm

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.
Clive
August 1961 Flat floor ots

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

Post by splosh » Mon May 04, 2020 10:24 pm

I was right...... found it here.... back in 2015
viewtopic.php?t=6936
Clive
August 1961 Flat floor ots

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

Post by abowie » Tue May 05, 2020 12:34 am

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.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
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Philk
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#6 Re: Trying to identify what this spring is for

Post by Philk » Tue May 05, 2020 10:24 am

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.

Image
Phil
1964 S1 3.8 OTS

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

Post by ysmalkie » Thu May 07, 2020 6:46 pm

It was on my '63 car:


Image


Image


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

Tadek
Tadek

e-type S1 3.8 FHC - in restoration phase...
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ralphr1780
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#8 Re: Trying to identify what this spring is for

Post by ralphr1780 » Thu May 07, 2020 7:34 pm

I have the same spring on mine too, built Oct 62.
Ralph
'69 OTS + '62 OTS - Belgium

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