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Post by Penguin45 on Jun 5, 2021 17:05:24 GMT
Yay! Well done. Had to be something simple.
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Post by dave1800 on Jun 5, 2021 23:58:30 GMT
Hi Dave Do you mean the CO emissions were 12.8% ? If so it sounds more like a float chamber issue. These engines seem to run best with a reading around 3.5% to 4.0% which is just a little on the rich side. Good to see the car is running again. David Must add that emissions check last year came in at 12.8 Next job is carb methinks. New needle and possibly jet Son returns to Surrey next Saturday so that will be a job for when he next returns to civilisation |
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UMO 406G
Jun 6, 2021 5:38:30 GMT
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Post by peppib on Jun 6, 2021 5:38:30 GMT
Yes David, 12.8 carbon emissions
Will investigate when I feel well enough and when Son returns to do the work.
That carb has always puzzled me. I can’t find any records of it being changed but an inch and quarter pancake filter back fits and inch and a half doesn’t
Dave
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Post by dave1800 on Jun 6, 2021 8:22:19 GMT
And the HS6 carb is 1.75" !
David
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UMO 406G
Jun 6, 2021 8:41:15 GMT
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Post by peppib on Jun 6, 2021 8:41:15 GMT
Precisely
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Post by dave1800 on Jun 6, 2021 12:08:20 GMT
I seem to recall Tony W had some new os air filter housings including the aluminium bolt. May be the best way to go?
David
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UMO 406G
Jun 6, 2021 14:52:08 GMT
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Post by peppib on Jun 6, 2021 14:52:08 GMT
The pancake filter I have has the air hole enlarged
I still have the original air cleaner but prefer the pancake one
I have every bill from order and invoice in 1969 through to 1997. I purchased it in 2006 and have not touched the carb, so one of the two owners between 1997 and 2006 must have changed it
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Post by Penguin45 on Jun 6, 2021 17:23:55 GMT
Odd. The pancake filter will let more air through, so would more than likely lean the mixture off. 12.8% is very rich - you might even be able to smell petrol in the exhaust gases. Anyone up there who could do a carb set-up for you?
Chris.
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UMO 406G
Jun 6, 2021 20:16:57 GMT
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Post by peppib on Jun 6, 2021 20:16:57 GMT
Local garage tried, complete with CO probe up the exhaust (car,not mechanic) and 12.8 was the lowest level he could get, and even then it was with the air cleaner removed
Dave
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Post by dave1800 on Jun 7, 2021 0:24:01 GMT
It takes me back to my earlier thoughts about the float chamber valve not sealing, a fairly common fault with vehicles laid up and the fuel evaporating leaving a varnish or the float itself failed again not uncommon. Much more likely than excessive wear on the needle or jet with the unsprung needles. David Local garage tried, complete with CO probe up the exhaust (car,not mechanic) and 12.8 was the lowest level he could get, and even then it was with the air cleaner removed Dave |
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UMO 406G
Jun 7, 2021 7:08:21 GMT
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Post by peppib on Jun 7, 2021 7:08:21 GMT
David
The fuel hasn’t evaporated - gauge shows same as when I parked her and in the past she has been unused for much longer periods, and she runs fine now. I will check it out though
How I yearn to be able to do things myself. B....... youths showing off behind the wheel of his Dad’s van. I was told 30 years ago this would happen but I didn’t realise it would be so difficult to handle
Dave
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Post by dave1800 on Jun 8, 2021 0:47:31 GMT
I was thinking more of the small volume of fuel in the float chamber and jet evaporating leaving a sticky residue rather than from the tank. The CO level of 12.8% equates to an air fuel ratio of around 10 which would show up as black smoke and feel like the car was running with the choke partially out.
A float chamber issue would likely run rich at idle but get progressively less so at higher rpm. Another possibility is that the choke tube is not returning fully. Both of these issues can be checked fairly easily if you can a find a volunteer. Maybe there is a local Mini/Morris 1000/1100 etc car club with someone willing to help?
David
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Post by peppib on Jun 8, 2021 6:59:12 GMT
New choke cable recently fitted so that goes off really well. I will get float chamber dismantled and inspect it as soon as I can
As for local car clubs, I was a member of north east branch of MMOC and even hosted their www site on my webspace. It didn't end well. Not had contact with anyone there for over 10 years
Hexagon nut is right at the top of its adjustment range. Moving it down just 1 flat shot the carbon reading up to 15
Dave
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Post by andrewa on Jun 8, 2021 10:45:03 GMT
Probably worth checking that everything externally on the carb is moving nice and smoothly throughout it's operating range first.
Next I'd check that the choke actually is off when the new cable says it is..i.e. it's off at the carb end - worth loosening the carb end to double check if poss. The other thing I've had is the ferrule for want of a better word on the choke cable that locates on the carb hasn't fully located so it's running on slight choke all the time.
I guess at least you now know why the plugs are fouling, the next question is was it Ok before the new choke cable or is the rich running an old problem?
If historic then you're into float chamber/crap in carbs etc.
Good luck - hopefully it's something simple.
Andrew
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UMO 406G
Jun 8, 2021 12:57:19 GMT
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Post by peppib on Jun 8, 2021 12:57:19 GMT
Thanks Andrew. Choke cable was fitted whilst the car was parked up. That ferrule is a real pain. You have to get it just right or it pops out of its socket
Have now arranged for my original cleaner (like a daughter to me) to do an hour a week helping me on things in the flat and on the cars. Not much time but at least it’s a start
Dave
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