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V8 3.5 efi flapper throttle pot replacement?
Posted: Mon Mar 11, 2019 8:58 am
by Joker
My 3.5 efi TPS is broken. They don’t make them anymore.
Can anyone tell me which other TPS will work please?
I found this one but I’m not sure if it will work.
http://www.emeraldm3d.com/sensors-and-r ... ensor.html
If I make a plate for it to fit.
Can anyone help?
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Sat Aug 03, 2019 1:05 pm
by DaxLaxV8
Hi. I found that the wires get brittle and are subject to failure. I refurbished mine by carefully grinding down through the bakelite to the encased wires using a 3mm diamond tipped tool. I then carefully bent the wires up. This gave a reasonable length projecting through the top surface. I attached three block connectors and new tails wired into the existing three pin plug to the other side of the connectors. Placing the unit in a vice I wrapped the OD with insulation tape and potted the wires with two pack epoxy resin to ensure the block connectors are covered. The engine has been running and the refurbishment has been wholly successful, at no cost. A spray with black paint and it looks great. I have some photos if they would help?
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Sat Aug 03, 2019 1:22 pm
by DaveEFI
That's interesting. It has been much covered in the SD1 club forum, as you'd expect, and the common failure is the carbon track simply wearing out with age and use. It is possible, but fiddly, to move the wiper onto an unworn part of the carbon track. At one time, RS Components sold a Vigay pot which was an good electrical replacement, but required an adaptor plate made to mount it. I think it is discontinued now.
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Mon Aug 05, 2019 1:09 pm
by SuperV8
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Mon Aug 05, 2019 1:59 pm
by DaveEFI
Not if the pic is correct. The original has a socket (female) that fits over the throttle spindle. IIRC, one of the Jag specialists has had the originals re-manufactured.
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Tue Aug 13, 2019 3:50 pm
by DaxLaxV8
Both these items would replace my original part. However, my fix cost me an hour of my time.
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Wed Aug 14, 2019 8:43 am
by DaveEFI
Ramon Alban has an article on fixing it and the RS replacment here.
http://www.vintagemodelairplane.com/pag ... Pot01.html
Re: V8 3.5 efi flapper throttle pot replacement?
Posted: Sat Aug 17, 2019 4:47 pm
by DaxLaxV8
I don't think there is a low cost option; other than to repair. See photo you can see the block connectors.