[TR] tr3 loss of power

[Frank Fisher]

thanks to all for help. always good as usual.
traced it to a kinked soft line
causing a short flow of fuel.
"on the road again" whooo hooo
frank
________________________________
From: Hans de Ferrante <tr3 at roadrunner.com>
To: Triumph List <triumphs at autox.team.net>
Sent: Sat, July 3, 2010 8:06:52 AM
Subject: Re: [TR] tr3 loss of power

On Jul 2, 2010, at 7:30 PM, Frank Fisher
wrote:

> long story...but here goes
> 
> couple months ago the tr3 lost
power. at one point
> it quit completely. got out pumped the primer on the
fuel pump. got in and it
> started and ran good. then it lost power again and
then it got it back, lost
> power.......got it back...etc. it limped and ran
and got me home.

That sounds almost exactly like what happened to me  with
my  TR3A. It had been in hibernation for 27 years before recent restoration.
Every time I thought I fixed it, it recurred, usually on the highway going
over 60 miles and tromping down on it. After pulling over and stopping it
would usually run o.k. again for a little while and I could limp home with it.
This was my sequence of events with the problem recurring  every time between:
1)    Replaced fuel tank, purged fuel lines, filters and rebuilt fuel pump.
2)    Found that the vacuum  piston was sticky at the top position in the bell
chamber of the  second SU carb -- Cleaned and polished the chamber wall.
3)    Found that the float chamber valve was stuck in the shut position of the
same carb --- replaced it.

4)    Found that the float chamber valve was stuck
in the open position of the same carb. Discovered that the spring loaded tip
of needle assembly had worn a     dimple in the float lever arm causing the
needle to misalign and jam ---- carefully sanded and polished the  lever to 
remove the dimple ---The needle seemed     to travel freely, now using the
same needle and seat.

5)    Found that the  same needle was  stuck again in
the closed     position and was sticky again. Everything was clean as a
whistle . I replaced it with  a  new seat and needle. I noticed that the
second seat and needle set did not fit as tightly as the first one. I bought
both of them simultaneously from Moss and I suspect that the quality control
of some of this aftermart stuff leaves something to be desired.

I have since
driven it for about 250 miles and it hasn't happened again,  but,  frankly, I
still don't  quite trust her enough yet for any longer trips.
I hope this may
help you fix your problem.

Hans
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