Search found 513 matches

by johnetype
Fri Jun 19, 2026 1:27 pm
Forum: General
Topic: Attention....loss of Images
Replies: 46
Views: 22600
Great Britain

Re: Attention....loss of Images

The VPN issue is a sideshow; the critical resource for the forum is its IP and that's embodied in the data and images posted by everyone. If we choose to give ownership of that IP away to Third Party sites to host that data for free we loose control and become hostage to fortune to their inevitable ...
by johnetype
Mon Jun 15, 2026 10:49 am
Forum: Technical
Topic: Thinner than usual valve pads
Replies: 31
Views: 2109
Great Britain

Re: Thinner than usual valve pads

You certainly can shorten the valve stems by a certain amount - when I had a late large valve head rebuilt recently, they removed the same amount from the end of the valve stem to equal the amount the valve face lapping had moved the valve up by to save finding new shims - but I doubt you could shav...
by johnetype
Thu Jun 11, 2026 10:28 am
Forum: Technical
Topic: Voltage across coil terminals
Replies: 11
Views: 1760
Great Britain

Re: Voltage across coil terminals

Steve, this is just not correct. If you measure a voltage without any current flowing you will get zero voltage drop and hence it's pointless. If you do what the other Steve has suggested and disconnect the wire at the coil +ve and measure the voltage what you're actually doing is measuring the volt...
by johnetype
Thu Jun 11, 2026 8:16 am
Forum: Technical
Topic: Voltage across coil terminals
Replies: 11
Views: 1760
Great Britain

Re: Voltage across coil terminals

Once you disconnect the wire to the coil +ve all voltage measurements are meaningless because you've broken the circuit and no current can flow. It's not the normal operating condition. It's why Tom added his caveat in post #5 because you need the points closed for current to flow.
by johnetype
Wed Jun 10, 2026 10:46 pm
Forum: Technical
Topic: Voltage across coil terminals
Replies: 11
Views: 1760
Great Britain

Re: Voltage across coil terminals

No, Steve's test tells you nothing except that you've got continuity between the coil +ve terminal and the battery +ve terminal - and you knew that already because the car starts and runs. There's a long length of wire with several connectors in it between the coli +ve terminal and the battery +ve w...
by johnetype
Mon Jun 08, 2026 10:07 pm
Forum: Series 2
Topic: Play in steering wheel
Replies: 11
Views: 140266
Great Britain

Re: Play in steering wheel

I have the same problem; may I ask what your solution was?
by johnetype
Mon Jun 08, 2026 10:01 pm
Forum: Technical
Topic: Voltage across coil terminals
Replies: 11
Views: 1760
Great Britain

Re: Voltage across coil terminals

It may be fine but I'd also measure from the coil negative to ground and from coil positive to battery positive to understand where the nearly 2 volts is going.

Once you know where and how much all the voltage drops are in the circuit can you make a better judgement on what's alright and what isn't.
by johnetype
Sun May 31, 2026 9:17 pm
Forum: Series 1
Topic: 2+2 windscreen seals
Replies: 5
Views: 948
Great Britain

Re: 2+2 windscreen seals

Based on my experience, you need both. The main seal comes (from COH Baines) to a set length with the ends welded/glued together which is what you need to prevent leaks. The second seal is the locking strip which is sold by the meter. Here you need to make sure you have enough because you want your ...
by johnetype
Sun May 31, 2026 8:15 am
Forum: Technical
Topic: Fuel Pump
Replies: 4
Views: 862
Great Britain

Re: Fuel Pump

From my experience with the same pump, no, nothing to worry about.
by johnetype
Sun Apr 19, 2026 9:16 pm
Forum: Technical
Topic: 1964 3.8 Cylinder head temperature
Replies: 8
Views: 2467
Great Britain

Re: 1964 3.8 Cylinder head temperature

That type of infra-red temperature gun generally measure the average temperature within a circle whose diameter is dictated by how far the gun is from the surface in question - not just at the point the red dot is. Given how far away you appear to be from the cam covers I strongly suspect their actu...
by johnetype
Mon Apr 06, 2026 8:06 am
Forum: Technical
Topic: Washer jet replacement..
Replies: 3
Views: 1683
Great Britain

Re: Washer jet replacement..

Use jets from a 2+2 that have two jets each. Use silicon rather than PVC washer hose. Find someone with small hands to help. Connect the hose to the jet and feed the hose in from outside the car. Slide the nut back up along the hose from the inside so the hose guides the nut onto the end of the jet....
by johnetype
Mon Feb 23, 2026 9:58 pm
Forum: Technical
Topic: SU fuel pump circuit breaker spark
Replies: 4
Views: 2063
Great Britain

Re: SU fuel pump circuit breaker spark

Varistor or capacitor, both will do a similar job in this application. If you were to use a large non polarised capacitor such as those across the input to a power supply your pump would remain polarity insensitive. A capacitor would be a better choice for suppressing RF radiation so would be my cho...
by johnetype
Tue Jan 27, 2026 9:55 am
Forum: Series 2
Topic: Cylinder Head Woes
Replies: 16
Views: 29978
Great Britain

Re: Cylinder Head Woes

That story has been around for a few years now. Whilst there are undoubtably fakes around I'm more dubious that the major suppliers have been taken in, in any significant way. There are videos out there comparing fakes with originals and in the ones I've seen the fakes are pretty obvious with errors...
by johnetype
Thu Jan 15, 2026 8:10 pm
Forum: Technical
Topic: Use of ChatGpt for diagnostics?
Replies: 8
Views: 8289
Great Britain

Re: Use of ChatGpt for diagnostics?

The cautionary warnings are justified up to a point but also the Luddites are out in force on the use of AI. AI is basically searching and scraping information for you across the internet and then aggregating it. When your source(s) are likely to be limited such as for a car like an E type then as s...
by johnetype
Sat Dec 13, 2025 9:08 am
Forum: Series 2
Topic: Cooling fan not working
Replies: 5
Views: 3473
Great Britain

Re: Cooling fan not working

No one has been in there before, I've owned the car for too long. Whatever it is it is certainly not high quality and over the years the ends of the springs pull through it and let go.

Producing a plastic based replacement is a great 3D printing opportunity.
by johnetype
Fri Dec 12, 2025 10:04 pm
Forum: Series 2
Topic: Cooling fan not working
Replies: 5
Views: 3473
Great Britain

Re: Cooling fan not working

Before consigning the failed fan motor to the bin and forking out a significant sum for a replacement, remove the rear cover and check the piece of cardboard - yes I kid not - that holds the tension springs together that keep the brushes on the commutator - or not.
by johnetype
Fri Dec 12, 2025 9:57 pm
Forum: Series 1
Topic: Front wing seperators
Replies: 6
Views: 2368
Great Britain

Re: Front wing seperators

And given the rust trap this particular area is, I used nylon washers when I rebuilt my bonnet.
by johnetype
Thu Nov 27, 2025 9:06 am
Forum: Series 1
Topic: In-tank fuel pump
Replies: 5
Views: 2687
Great Britain

Re: In-tank fuel pump

There are no benefits to using an in tank fuel pump as configured by Jaguar. They moved to an external pump - a tried and tested SU of sufficient capacity - as soon as possible, and you should do the same. Fuel smells should not be linked to pump position. With appropriate quality hose and fittings,...
by johnetype
Thu Nov 13, 2025 12:00 pm
Forum: Welcome!
Topic: New member introduction
Replies: 4
Views: 7102
Great Britain

Re: New member introduction

Unless you know the original engine is toast, I wouldn't leap in to a full rebuild costing £10,000+ especially if you are trying to keep a tight control on costs which at today's prices could easily exceed the value of the car. I'd be removing the cylinder head and the sump and giving the internals ...
by johnetype
Fri Oct 17, 2025 7:27 am
Forum: Technical
Topic: pre-programmed curves on 123 ignition - help please?
Replies: 145
Views: 139321
Great Britain

Re: pre-programmed curves on 123 ignition - help please?

The Stromberg carburettors are linked to meeting US emissions specifications with distributor timing curves also dictated by meeting emissions specs. Running Strombergs here in the UK is just the same as running SUs assuming you've drilled for a vacuum advance take-off, removed or permanently wired ...