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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