Hi Pat,
I have dropped a TR4 motor into a TR3. Everything is the same except the
front mounting plate. Some of the ancillaries are different. ie intake,
exhaust, valve cover. In 1984 I found out the hard way that the front plate
was different. I rebuilt this nice TR4 engine, painted nice and was lowering
it in and the front engine mounts would not mate. So out it came. The real
pain of it was, the plate sits behind the timing chain, so all of that had
to come off to exchange it for my old TR3 plate.
Cheers,
Mike Thompson
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>From: "Pat" <pleask@mailhost.wlc.com>
>To: "TRlist" <triumphs@autox.team.net>
>Subject: TR3 and TR4 Motors
>Date: Sun, Jul 9, 2000, 8:03 PM
>
>
> I have a frozen motor for my 1957 TR3A TS33154 (Project car).
>
> I have a spare motor from my TR4A Parts car (Motor is also is sad shape)
>
> I know that the TR3A motor was 1991cc and the TR4 was 2138cc - correct ? (In
> most cases)
>
> The diff in size was the sleeves.. no ?
>
> My question is: How compatible are the two motors if I find something in my
> '3 motor is no good ?
>
> TR4 motor number is TS13959E
> TR3 motor number is TS81530F
>
> Thanks all !
> Pat
>
> PS: You have all been a great bunch and a wealth of information and help..
> thanks.
>
>
>
>
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