Search found 387 matches

by Bob.
Wed May 27, 2026 9:23 am
Forum: Technical
Topic: Brake servo finish - S1 1965
Replies: 2
Views: 910
Great Britain

Re: Brake servo finish - S1 1965

Don't know if this helps but S3s which commenced build in 1970, so a few years later than your S1, had the vacuum chamber of the servo finished in yellow cadmium plating according to Richard Ross in his book Guide to Authenticity. This is an original 1971 servo. https://i.postimg.cc/pdnXRG4X/S3-Brak...
by Bob.
Fri May 22, 2026 1:21 pm
Forum: Series 1
Topic: Passenger Door 1961
Replies: 5
Views: 831
Great Britain

Re: Passenger Door 1961

Hi Steve,
When the S1 2+2 was introduced in 1966 it had a plain button in the handle and a separate lock below. Perhaps that is the source of your handle.

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by Bob.
Fri May 15, 2026 4:03 pm
Forum: Series 3
Topic: Disc to Hub bolts & nuts orientation
Replies: 10
Views: 1465
Great Britain

Re: Disc to Hub bolts & nuts orientation

No, you didn't miss it Steve, it's from the press release.
Bob
by Bob.
Fri May 15, 2026 1:10 pm
Forum: Series 3
Topic: Disc to Hub bolts & nuts orientation
Replies: 10
Views: 1465
Great Britain

Re: Disc to Hub bolts & nuts orientation

This Jaguar illustration clearly shows bolt heads outwards with wire wheels. Looking at the nut it seems possible it would foul the wheel if outboard. https://i.postimg.cc/FFYznKzs/S3-Front-Suspension-schematic.jpg This claimed 15,000miles S3 currently for sale on BAT shows the same orientation. htt...
by Bob.
Tue May 05, 2026 11:14 am
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

Hi Colin, It's about 120 pages to scan the whole document but all the specification data is reproduced verbatim in the Appendices of Porter's Definitive History, which I imagine most people who are interested in this level of detail will already have. Re publishing it on the forum, not sure about co...
by Bob.
Thu Apr 30, 2026 1:55 pm
Forum: Series 3
Topic: Hot Start Problem
Replies: 2
Views: 1603
Great Britain

Re: Hot Start Problem

Hi John, Couple of thoughts both related to heat soak from a hot engine when stationary. 1. Further age degradation of the 50+ year old electronic components in the amplifier has occured since it was relocated and without airflow they are now failing at a lower temperature than they were previously ...
by Bob.
Sat Apr 18, 2026 1:06 pm
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

It appears so.
Extract from the S3 launch Press Pack.

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Other than the first few hundred 2+2s refered to earlier, the part number for S3 front dampers remained the same throughout production of both 2+2 and OTS cars.
by Bob.
Tue Dec 16, 2025 7:11 pm
Forum: Series 2
Topic: Steering Column
Replies: 8
Views: 3756
Great Britain

Re: Steering Column

Same upper column was used on later S2s and S3s. This is S3, a thin plastic split sleeve held on with two thin plastic bands.

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by Bob.
Fri Nov 28, 2025 9:07 am
Forum: Series 3
Topic: Instrument Light Brightness Switch
Replies: 19
Views: 17156
Great Britain

Re: Instrument Light Brightness Switch

Neither did LHD.

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by Bob.
Thu Nov 27, 2025 10:00 am
Forum: Series 3
Topic: Instrument Light Brightness Switch
Replies: 19
Views: 17156
Great Britain

Re: Instrument Light Brightness Switch

Looking deeper, it seems that this dimmer was added to LHD cars in early 1972, but it wasn't fitted to RHD cars, which just got a blanking plug to fill the new mounting hole.

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by Bob.
Wed Nov 26, 2025 6:50 pm
Forum: Series 3
Topic: Instrument Light Brightness Switch
Replies: 19
Views: 17156
Great Britain

Re: Instrument Light Brightness Switch

Later handbooks clarify. The OP has a 1971 ('early') car so won't have the supplementary control in the footwell. The parts manual shows the rheostat it but doesn't identify the change point when it was added. https://i.postimg.cc/G2qkh4Gg/S3-Rheostat-Panel-Light-1.jpg https://i.postimg.cc/7PtWK6dS/...
by Bob.
Wed Sep 10, 2025 8:39 am
Forum: Technical
Topic: Starter motor gear lubrication
Replies: 2
Views: 1441
Great Britain

Re: Starter motor gear lubrication

This extract from a 1973 Lucas Workshop Instruction on the "Roller Clutch Drive Assembly" may help.
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by Bob.
Thu Jul 24, 2025 8:30 am
Forum: Technical
Topic: Roll over protection
Replies: 9
Views: 15659
Great Britain

Re: Roll over protection

For effective roll over protection have a look at Bob Tulius' car for mounting points. It's in the Gaydon museum.

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by Bob.
Wed Jun 18, 2025 3:38 pm
Forum: Series 3
Topic: V12 Engine weight
Replies: 6
Views: 15683
Great Britain

Re: V12 Engine weight

From the S3 Press Release: Referring to the V12 1. "Only about 80lbs (36kg) more than a 4.2 litre XK six-cylinder unit, both fully equipped" 2. Aluminium block -"Jaguar saved 116lbs. (53kg) by comparison with the same unit in cast iron" 3. "The complete engine weighs only 680lbs. (308kg) with all an...
by Bob.
Sat Mar 22, 2025 1:54 pm
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

Interesting background on ride frequency thanks.

The wheel rates come from the S3 launch press release.

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by Bob.
Tue Mar 18, 2025 6:26 pm
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

I'm presuming you're referring to the information in Appendix 7 The production torsion bar figure of 100lb/in" is given in the document headed "Comparative Specification of Production "E" Type and Coomes "E" Type 18th. August 1962 " in Appendix 9. 0.750" nominal diameter, 36 7/8" length - V12 cars ...
by Bob.
Fri Mar 14, 2025 6:41 pm
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

Facsimiles of the documents are in Peter Wilson's book "Strictly No Admittance". Probably be breaking some rules to post copies here.
by Bob.
Thu Mar 13, 2025 7:55 pm
Forum: Technical
Topic: That Torsion Bar Question Again?
Replies: 23
Views: 93178
Great Britain

Re: That Torsion Bar Question Again?

Hi Damian, Prior to introduction of the larger diameter (0.780-0.784") torsion bars referred to above, production bars were rated at 100lb/in. The wishbone rubbers contributing a further 16lb/in. (info from Jaguar documents dated 1962). Bob PS Have you seen CliveR's posts on jag-lovers? Sounds like ...
by Bob.
Fri Jan 31, 2025 8:33 pm
Forum: Series 3
Topic: How to remove rear badges?
Replies: 13
Views: 61865
Great Britain

Re: How to remove rear badges?

Just to add that the S3 PM shows 3off BD25659 each for attaching "Jaguar"and "E Type" and 3off BD25644 for "V12". Jaguar called both "Friction Bush, securing emblem". They are shown fitted with the top hat on the outside of the panel. Some of the top hats are just visible in the second image below. ...
by Bob.
Thu Jan 30, 2025 8:53 am
Forum: Series 3
Topic: Need help with radiator header tank bracket part number
Replies: 3
Views: 40847
Great Britain

Re: Need help with radiator header tank bracket part number

Do you mean this bracket whch is part of the coolant pipe assembly?
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