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Aviation Gasket Sealant

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UKPhilTR7
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Re: Aviation Gasket Sealant

Postby UKPhilTR7 » 24 Oct 2020 20:35

The funny thing is that I took the pump off today. I had the long arm pump and the spacer was split in half. Think that may be where the leak is coming from.

The issue now seems to be getting my hands on a reasonably priced 13mm spacer.

My mate has a 3D printer, shame he could not print me a spacer.
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Hasbeen
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Re: Aviation Gasket Sealant

Postby Hasbeen » 25 Oct 2020 02:45

Good luck with that Phil. You may be lucky with the couple of really knowledgable specialists in the UK. However if as Beans says, those pumps are not circulating in Europe, it may be harder than here.

It is not that spacers are not available, but with so few parts shop people knowing today what a mechanical fuel pump looks like, getting an assistant who knows how & where to find them may be very hard.

Try old fashioned tractor people, they use the pumps, & some actually have repair kits for them. I found the kit for my 40s Fordson Major fitted the spare pump off the 7.

However when My mate restoring a Dolly Sprint, & I both needed a spacer each, we tried all the usual places with no luck. The local triumph guru, Greg Tunstal in Brisbane knew all about them, but had none, & couldn't find them.

It was only when I was being told by a counter bloke at the local Repco parts shop that he had never heard of them that I got lucky. An old hand out the back heard the discussion, came out to the counter, pulled out the right parts book, [not computer listing], found 2 sizes available, & ordered them for me that we found them. They were very cheap once found.

I don't think you could print one. A thermo plastic would creep, & slowly squash under heat & bolt pressure. The things are made From a thermo set, [Phenolic or Melamine]. If you could find a suitable sheet of either, you could cut one out. If you are pig headed enough you could cut one out of aluminium, or if rich enough, get one machined from it.

Unfortunately we've had a total change of staff at the local Repco, or I'd offer to get one for you. I doubt the current lot would know.

If all else fails, try making one out of a sheet of ABS plastic. You could machine it with wood router equipment, & it could stand up for some years in that cold climate.

As I said, good luck.

Hasbeen

Beans
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Re: Aviation Gasket Sealant

Postby Beans » 25 Oct 2020 15:52

UKPhilTR7 wrote: ... The funny thing is that ... the spacer was split in half ...

Just use some silicon sealant between the two spacers ...
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1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

UKPhilTR7
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Re: Aviation Gasket Sealant

Postby UKPhilTR7 » 25 Oct 2020 22:16

Thanks Has been, I was thinking the same regarding the printing of one. Shame as originally the 3D printers seemed to be the answer to everything (and a little more) however the more you look the more you think not.

I have been having a look and I have found a few places that may fit the bill:

https://www.sdizicx.top/index.php?main_page=product_info&products_id=360475
https://www.jamespaddock.co.uk/fuel-pump-spacer-block-later-1500-2

They do however seem a little thinner than the 13mm needed.

If not it will have to be a new pump without the spacer, the shorter arm.

I was thinking about putting the two parts back together, but I wondered how long it would last.
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Cobber
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Re: Aviation Gasket Sealant

Postby Cobber » 26 Oct 2020 09:25

I should run some up outta alloy on the milling machine.......... finding the time is the challenge!
Now the end of the lockdown here in Victoria is in sight, I have more work than I know what to do with, and enquiries keep coming!
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"

'80 Triumph TR7.
'73 Land Rover (Ford 351. V8).
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'69 Ford F250 pickup.
'83 Jaguar XJ6 Sovereign S3.

UKPhilTR7
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Re: Aviation Gasket Sealant

Postby UKPhilTR7 » 27 Oct 2020 21:17

Well what a turn up. I ordered one of the thicker gaskets and it arrived today. Wow what great fast service, well impressed.

I did put it on today and ran the car, thought I had sorted it all out as it was running sweet. She did dump a bit of fuel but I was hoping that was just a blip, she is a bit old these days lol. Before I went for tea I put a tissue under the pump to see if anything leaked or if I could maker that job of the list finally. When I came bac from tea the tissue was soaking, oh dear not sorted. I also noticed that the new spacer was cracked. Gosh a new one and it is cracked.

I think the only option is to get a new pump which does not need a spacer.
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Hasbeen
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Re: Aviation Gasket Sealant

Postby Hasbeen » 28 Oct 2020 01:33

On most of these pumps in Oz the arms are easily interchangeable. Have a good look at yours. Perhaps all you need is the arm of an old pump from a wreckers yard.

Hasbeen

Beans
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Re: Aviation Gasket Sealant

Postby Beans » 28 Oct 2020 18:22

UKPhilTR7 wrote: ... Gosh a new one and it is cracked ...

Maybe you over-tightened the bolts?
On the other hand there shouldn't be fuel coming out that end of the pump!
Check your hose connections to start with. And a picture of the pump might help to determine the problem.
On some pumps the brass tubes for the fuel hoses can come loose.
Image
1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

UKPhilTR7
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Re: Aviation Gasket Sealant

Postby UKPhilTR7 » 13 Nov 2020 21:31

I seem to be having a bit of a game with my new spacer and trying to stop it leaking. I have replaced the spacer, added new gaskets and then replaced the bolts with studs, but she is still leaking. When running she is OK (nothing), but when she stops after getting up to temp she starts leaking. The only options I have now is to take it all off again, replace the gaskets for gasket sealant and if that does not work to use buy another pump with a smaller arm that does not need a spacer.

Lol wish the thing would stop leaking now, so I can move on to the next job.
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Beans
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Re: Aviation Gasket Sealant

Postby Beans » 13 Nov 2020 23:24

Did you re torque the fuel pumps mounts after the engine reached operational temperature?
Image
1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

dmtrmp6
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Re: Aviation Gasket Sealant

Postby dmtrmp6 » 13 Nov 2020 23:36

Phil, its possible that your leak is not from the gasket/spacer. In a typical mechanical pump there is a diaphragm that isolates the fuel chamber from the internal mechanical motion lever/shaft etc and usually a seal on the shaft to minimise any cross transfer of oil /fuel between the crankcase and fuel sides of the pump.
If there is any damage to the diaphragm and or wear in the seal on the shaft it is possible for fuel to make its way into the lower mechanical half of the pump and leak out via the motion lever pivot rod where it penetrates the lower chamber. This leakage can also make its way into the crankcase (If you remove the oil cap and 'sniff' the engine internals, or when you drain the oil, do you have a noticeable/obvious petrol smell? Sometimes the pivot rod is fitted to blind holes, sometimes the end of the rod is visible from outside the pump body. This is a area where fuel can escape and might be the source of your leak. Perhaps time for electric replacement. See further description of my installation on your other fuel pump topic. Rgds, Daryl M

dursleyman
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Re: Aviation Gasket Sealant

Postby dursleyman » 15 Nov 2020 15:54

My thoughts are similar to DarylM if you have used new gaskets and sealer I would suspect your leak is from the pump itself.
Russ

1981 TR7 Sprint DHC & TR7 Sprint FHC
Dursley
UK

http://tr7russ.blogspot.co.uk/

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UKPhilTR7
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Re: Aviation Gasket Sealant

Postby UKPhilTR7 » 15 Nov 2020 21:36

Thanks guys, I think you may be right. I have a friend who suggests using paper or card as temporary gaskets to show where the leak is coming from. If it does turn out that the pump is leaking I really think that the best option is to go for the electric pump. I have not had chance to smell inside the engine to see if there is a smell of fuel but I think it is time.
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Hasbeen
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Re: Aviation Gasket Sealant

Postby Hasbeen » 16 Nov 2020 01:12

Phil is the leak oil as I have assumed or fuel?

I have assumed that you have checked the pump to see that the diaphragm is not split & leaking, or the pump body is not cracked.

Hasbeen

Beans
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Re: Aviation Gasket Sealant

Postby Beans » 16 Nov 2020 18:19

Bear in mind that for an electric fuel pump you need to do some wiring.
Ideally fed through the ignition switch and an inertia switch ... just in case :shock:
Image
1976 TR7 FHC (currently being restored ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng)

http://www.tr7beans.blogspot.com/

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