"Just a Service"

[bmcecosse]

Obviously he doesn't know where to look - and has given up! Could be a worn needle valve in the carb float bowl that's causing it to flood over - easy and cheap to change. These cars are not in any way 'tempremental' and certainly don't need adjustments to suit the weather. Assuming it is SU carbs - take the air filter off and test each carb by lifting the piston inside the entry with a finger - it must slide up against a resistance from the oil in the damper - but when released must fall back with a 'clunk'. If it doesn't do that -something is wrong! Could also be faulty installation of the calibrated needle that regulates the fuel supply. To check need to take the 'bell' off and inspect where the needle is fitted in the centre of the piston - it must be flush with the base of the piston.

[Wayne S]

Deb,
If your struggling i'd suggest taking it to one of the speacialists Robsport or SS Preps if you can or at least a garage familiar with classic cars, MGs and Triumphs especially.

Even better see if you have a local TR Drivers club or TR Register group and take the car down. A damsel in distress will usually mean a speedy fix [;)]

<b>FOR SALE!!!!Purple 2.0 Litre DHC Grinnall</b>
Red 4.0 Litre V8 DHC Grinnall (with huuuuuge arches...!)

[Hasbeen]

Could you have a new, or overhauled fuel pump fitted, pumping too
high fuel pressure? This can cause the float chamber needles to weep
a little. Not a problem at driving revs, as you are using the fuel
at a faster rate.

It can be a problem at idle, as, even if it doesn't flood, it raises
the fuel level, causing the thing to run rich.

Have your fuel pressure checked. It should not exceed 2PSI.

As the pump holds line pressure after the engine stops, another
check is;
Remove the air filters.
Take the thing for a short drive.
Park, & turn it off.
Watch inside the carb throats, to see if petrol starts to ouse out
of the main jet, making the throat wet, around the needle.
If it does you have either, high fuel pressure, or dud needle & seat
valves, in the float chamber.

Hasbeen

[Debpazvin]

I know he mentioned something about pins which should be coming tomorrow with the jets & other bits. Something I've notice since problem started (which came on very suddenly) was that the rev counter now bounces about while you're going along instead of holding steady with the speed. Is this any help? After this episode I will be finding a club member/group (as you suggest) who will be happy to spend a few hours troubleshooting the thing and maybe giving me some free lessons in TR7 general maintenance just because they want to[;)].
Deb x

1980 Premium TR7-1 of 400 made.

[Debpazvin]

I just thought I'd better let you all know how the story ends. The jets & bits came so I took all the bits down to the garage including points & a condenser picked up at the last show. Few hours later got a call back-the carb kit was wrong (as I have waxstat jets not standard apparantly) BUT it was nothing to do with that. It was an earth wire on the distributor which was not funtioning properly and sending (petrol?)thru to the points instead of the condenser (I think he said). Anyway, all things said it really only needed the service parts & a tune, change to the "mixture"on top of that so it ended up being pretty much "just a service" anyway. I am so happy to get her back & she runs really sweet & at only £90 for the service parts & labour I am really happy!

Thank you all for your input, will come in handy "next"time.

The End
Deb x

1980 Premium TR7-1 of 400 made.

[Wayne S]

Cool , glad you got there in the end.

But waxstat jets??!!?!?! arrrgghhh throw them away - and those pesky poppet valves! [}:)]

hehehe [8D]

<b>FOR SALE!!!!Purple 2.0 Litre DHC Grinnall</b>
Red 4.0 Litre V8 DHC Grinnall (with huuuuuge arches...!)

[Hasbeen]

Thats great Deb, now both of our "damsels" are no longer in
distress.

It does my heart good, knowing both you, & Linda are now zipping
around in your 7s, rather than sitting sadly at home.

Hasbeen

[Debpazvin]

Wayne, what do you mean, please enlighten me?
Deb x

1980 Premium TR7-1 of 400 made.

[Debpazvin]

Actually, Hasbeen, I bet these cars much prefer your weather, I know I would.
Deb x

1980 Premium TR7-1 of 400 made.

[busheytrader]

Good stuff.

It's good to hear that all's well now.

Especially if you're driving through the winter, watch out for any other electrical gremlins. Connections or switches may just need cleaning up to get things working again. I had issues with the headlight / sidelight switch on the dashboard and the red headlight connectors in the front of the engine bay. After a good cleanout the lights haven't played up since.

Poor bulb connections can also make the indicators run painfully slow.

Cheers,


Adam

[Hasbeen]

Deb, I think what Wayne was saying was that waxstats are not
renowned for their long term reliability. There are horror stories.

Perhaps, once you are really rich, & famous, you should replace
them, with the old fashion ones.

Hasbeen

[Wayne S]

As Hasbeen said, they were a nightmare for me and I have heard many other stories to the same effect. The waxstat jets fail to respond to auto adjusting like they should and constantly leaned out the mixture and the poppet valves in the butterflies ended up staying open all the time!

My solution was to use jets from a TR4, the red plastic covered type and also TR4 butterflies which are solid, musch better tuneage and smoother running ever since. Soemthing to look at when you have the time. Cost about £40 and a happy evening in front of the telly to change them [8D]

<b>FOR SALE!!!!Purple 2.0 Litre DHC Grinnall</b>
Red 4.0 Litre V8 DHC Grinnall (with huuuuuge arches...!)

[john 215]

Hi,
100% agree with Wayne, waxstat jets great in theroy in that they are suppose to auto adjust mixture as temp changes but in practice as often the case just caused more problems than they are worth.
Popet valves are for emmission reasons only ditch them as well.
Great article in this months TR Reg Mag, Wanye well done mate, you lads and lasses in the 'YOOF' know how to enjoy yourselfs, if was 20 years younger!!! Also a letter in there someone defending the 7 [:0]
Cheers John.

LIVE LIFE A QUARTER OF A MILE AT A TIME!
1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6,ON THE ROAD NOW KICKING AR5E !!!!
Read My Blog http://www.waringstowntr7s.co.uk/blogs/ ... hp/John215

[Debpazvin]

Does this mean that I have just paid to send the "wrong" kit back when the mechanic could have just put the standard jet/carb kit which I had ordered "incorrectly"?
Deb x



1980 Premium TR7-1 of 400 made
.

[Hasbeen]

I hope the other blokes answer that, as I just got my friendly
supplier to send me the correct stuff to replace the jets.

With the butterflies I simply soldered the popet valves shut, as
replacement butterflies were a bit harder to get, here.

One advantage of getting old, you can win more arguments with your
self. I simply told myself that the turbulence they cause, in the
air flow, would aid the mixing of the petrol in the inlet. 40 years
ago, I would have had to get the right stuff.

Hasbeen