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Evening all,
Well, following previous posts regarding the SU on my Metro Turbo the needle and spring were successfully changed and the float and mixture set to acceptable levels.
So I take what I thought was the 'new' sickly carb off and put the original back on. Nice new gaskets etc and all is bolted on nice and properly with fresh, light oil in the dashpot.
Fire extinguisher at the ready, I give it a crank. Get a cough and then nothing - just a stench of fuel. Basically, the same symptoms as when I went to start it with the other carb on.
Now, I know fuel is getting through fine and I'm at my wits end with it. However, the negative battery cable was getting very hot and I'm sure I saw it smoke on the last attempt at cranking it. What I need to know then is a) what's happening here and b) is this what's stopping my car from firing?
Please help, getting dangerously close to writing that 'For Sale' advert...
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sounds like the neg cable has deteriorated enough to get heated and melt insulation, rather than giving a decent earth
cant help with the carb, I know nothing about SUs
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Last Edit: Jun 4, 2010 21:59:52 GMT by Autofive
Someone just shot the elephant in the room. |
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Steve
Posted a lot
Making progress in small, easy to handle chunks of awesome
Posts: 2,028
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Cranking the engine over for long periods of time can put heavy load on all cables to the battery.....if its getting hot after only a short cranking session then as Autofive says the earth lead has most probably broken down. As for the stench of fuel, is there any fuel coming out of the carb itself whilst cranking over? and does your car use a mechanical fuel pump of electric? Steve  |
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Cheers for the pointers. Keep 'em coming!
Pump is electric and it's working fine. It's the fact that it's the same symptoms as with the other carb and I remember then that the lead was hot.
Just need to try and determine whether this breakdown of the cable is the fault?
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Steve
Posted a lot
Making progress in small, easy to handle chunks of awesome
Posts: 2,028
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Have you checked if you have a strong spark? IF you have a bit of an earth problem then the rest of the electrical system may be suffering because of it. Due to the heavy load from the starter when cranking, the ignition coil may not be getting enough juice to produce a spark......hence not starting and the strong smell of fuel as its just getting chucked down the bores and not being burned
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That sounds very likely. Judging by the eh, drip of petrol/oily mixture that was finding its way out the sump plug seal...
Help is great, much appreciated.
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Steve
Posted a lot
Making progress in small, easy to handle chunks of awesome
Posts: 2,028
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Two simple checks - Fuel(any getting to the engine) and Spark(anything at the spark plug)................do these first before assuming the worst  |
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andyf
South West
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Sorry, coming into this late but check the fuel pump pressure. SU`s can be susceptible to overfuelling and flooding. If the pump is new, check it is not oversupplying fuel - perhaps swap for an old one?
A pressure regulator may be in order.
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1980 Triumph TR7.
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colc
Part of things
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Run another earth strap from the engione directly to the chassis. Easiest way for a quick test is to run a jump lead from engine to chassis
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Run another earth strap from the engione directly to the chassis. Easiest way for a quick test is to run a jump lead from engine to chassis Or even better, from block to battery earth... allways diagnosed bad earths on engines that way and never had a problem... |
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And this is why I like Retro Rides. Thanks for all the help guys, it's really appreciated.
Going to have a hunt for all the earths, give 'em a clean and then go from there. I'll let you know...
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robg2
Part of things
Posts: 815
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Fuel... required
Spark... required
Spark AT THE RIGHT TIME... also required!!
Doesn't really sound fuel related to me, but that can normally be confirmed by wet plugs. So I'd check the timing and the firing order next, and also try running it off a can of new / clean fuel rather than what's in the tank.
I wouldn't think that a smoking earth lead is too much of an issue on this type of car if you've been cranking it for ages. The lead might not be the right one for a start.
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Long shot but have you checked that your positive battery cable isnt shorting out... mine done this in my mini then set the boot alight due to the negative cable melting and sparking  |
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colc
Part of things
Posts: 222
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If you have a choke cable, I'd check that as well, I've known a series engines trying to earth themselves through it.................
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I have three experiences with negative battery cables getting very hot. 1) Connected to the positive lead...  2) Corroded extensively 3) Not man enough for the load on it |
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