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Rick, Yes, I wondered what he referred to when he said Clean, thought it =
might be the outward looks possibly not inside and operational. Good commen=
ts below.
paul
On Apr 25, 2020, at 8:53 AM, Richard Lindsay via Mgs <mgs@autox.team.net<ma=
ilto:mgs@autox.team.net>> wrote:
Paul had some good suggestions and I agree. But Tom, I find myself ponderin=
g over your word 'clean'. Do you mean 'shine them up' or 'remove deposits f=
rom inside'? Carb cleaner is good for both jobs and let me add a word or t=
wo if cleaning inside is the quest.
I just cleaned the SUs on my TD and doing so made a world of difference. Bu=
t first of all, someone here said, "Most carburetor problems are electrical=
." That's a funny turn of phrase but it's true. I tuned and tuned my TD's S=
Us before putting the timing light on the TD and discovered that the timing=
was jumping around. New springs in the distributor's mechanical advance ca=
lmed the jitter making carburetor tuning a one time affair. But back to cle=
aning.
I marked the covers for rotation position, removed the damper pistons, and =
removed the covers, setting them aside carefully, labeled 'F' and 'R'. I th=
en lifted out the air pistons complete with needles, dumped out the oil, an=
d set them aside with their covers.
Using fresh, clean, pipe cleaners wetted with carb cleaner, I carefully ran=
the pipe cleaners up and down the jets, switching to a new pipe cleaner as=
the previous one became discolored. I then wiped the chokes clean with a s=
hop rag and carb cleaner. That finished the carb bodies.
I next cleaned the air pistons and needles with carb cleaner and shop rags =
paying particular care to protect the needles. I also sprayed carb cleaner =
into the damper bore, washing out any old oil. The insides of the covers we=
re wiped clean and the piston bores were flushed clean.
I live in a very humid climate where rust flashes quickly. I don't know whe=
ther the air pistons and bores are stainless but I took no chances. I appli=
ed 3-in-1 oil to the air pistons and inserted them into the bores in the co=
vers, coating all with light oil.
Back at the car I verified that the heights of the jets and were the same t=
hen switched on the fuel pump. Petrol came to the top of one jet but not to=
the other. I adjusted the float bowl valve until both levels were the same=
.
Back in went the air pistons, the covers on and the screws tightened gradua=
lly checking for proper piston drop as they were snugged down. BTW, I use l=
ockwashers on the carb bowl screws so they don't work loose but more import=
antly, so they don't need to be over-tightened.
The rest is tuning. Airflow was balanced and the mixture was reset.
The part I left out was cleaning the needles but that's quite controversial=
so let's leave it at, "I cleaned the needles."
And of course, this is just my story, not an authoritative treatise on SU m=
aintenance. Maybe it helps someone.
Rick
On Sat, Apr 25, 2020, 5:54 AM Thomas Gunderson via Mgs <mgs@autox.team.net<=
mailto:mgs@autox.team.net>> wrote:
What is a good way to clean SU carbs without removing them?
Tom Gunderson
1957 MGA 1500 rst
Sent from my iPhone X
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Paul Osborne
Department of Electrical and Computer Eng
University of Rochester
201 Hopeman Building RC
Rochester NY 14627
585-275-5226
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</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;" class=3D"">
Rick, Yes, I wondered what he referred to when he said Clean, though=
t it might be the outward looks possibly not inside and operational. Good c=
omments below.
<div class=3D""><br class=3D"">
</div>
<div class=3D"">paul</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><br class=3D"">
<div>
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Apr 25, 2020, at 8:53 AM, Richard Lindsay via Mgs <<a=
href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@autox.team.net</a>> w=
rote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div dir=3D"auto" class=3D"">
<div class=3D"">Paul had some good suggestions and I agree. But Tom, I find=
myself pondering over your word 'clean'. Do you mean 'shine them up' or 'r=
emove deposits from inside'? Carb cleaner is good for both jobs and l=
et me add a word or two if cleaning inside
is the quest.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">I just cleaned the SUs on my TD and doing so m=
ade a world of difference. But first of all, someone here said, "Most =
carburetor problems are electrical." That's a funny turn of phrase but=
it's true. I tuned and tuned my TD's SUs before
putting the timing light on the TD and discovered that the timing was jump=
ing around. New springs in the distributor's mechanical advance calmed the =
jitter making carburetor tuning a one time affair. But back to cleaning.</d=
iv>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">I marked the covers for rotation position, rem=
oved the damper pistons, and removed the covers, setting them aside careful=
ly, labeled 'F' and 'R'. I then lifted out the air pistons complete with ne=
edles, dumped out the oil, and set them
aside with their covers. </div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">Using fresh, clean, pipe cleaners wetted with =
carb cleaner, I carefully ran the pipe cleaners up and down the jets, switc=
hing to a new pipe cleaner as the previous one became discolored. I then wi=
ped the chokes clean with a shop rag
and carb cleaner. That finished the carb bodies.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">I next cleaned the air pistons and needles wit=
h carb cleaner and shop rags paying particular care to protect the needles.=
I also sprayed carb cleaner into the damper bore, washing out any old oil.=
The insides of the covers were wiped
clean and the piston bores were flushed clean.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">I live in a very humid climate where rust flas=
hes quickly. I don't know whether the air pistons and bores are stainless b=
ut I took no chances. I applied 3-in-1 oil to the air pistons and inserted =
them into the bores in the covers, coating
all with light oil.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">Back at the car I verified that the heights of=
the jets and were the same then switched on the fuel pump. Petrol came to =
the top of one jet but not to the other. I adjusted the float bowl valve un=
til both levels were the same.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">Back in went the air pistons, the covers on an=
d the screws tightened gradually checking for proper piston drop as they we=
re snugged down. BTW, I use lockwashers on the carb bowl screws so they don=
't work loose but more importantly,
so they don't need to be over-tightened.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">The rest is tuning. Airflow was balanced and t=
he mixture was reset.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">The part I left out was cleaning the needles b=
ut that's quite controversial so let's leave it at, "I cleaned the nee=
dles."</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">And of course, this is just my story, not an a=
uthoritative treatise on SU maintenance. Maybe it helps someone.</div>
<div dir=3D"auto" class=3D""><br class=3D"">
</div>
<div dir=3D"auto" class=3D"">Rick<br class=3D"">
<br class=3D"">
<div class=3D"gmail_quote" dir=3D"auto">
<div dir=3D"ltr" class=3D"gmail_attr">On Sat, Apr 25, 2020, 5:54 AM Thomas =
Gunderson via Mgs <<a href=3D"mailto:mgs@autox.team.net"; class=3D"">mgs@=
autox.team.net</a>> wrote:<br class=3D"">
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
What is a good way to clean SU carbs without removing them?<br class=3D"">
<br class=3D"">
Tom Gunderson<br class=3D"">
1957 MGA 1500 rst<br class=3D"">
<br class=3D"">
Sent from my iPhone X<br class=3D"">
<br class=3D"">
<br class=3D"">
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<blockquote cite=3D"mid:04744FC0-4DB2-40B3-8E8A-EF89713DC932@z.rochester.ed=
u" type=3D"cite" class=3D"" style=3D"orphans: 2; widows: 2;">
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<div class=3D"">
<div class=3D"">
<p class=3D"MsoNormal" style=3D"margin: 0in 0in 12pt; font-size: 12pt;">Pau=
l Osborne<br class=3D"">
Department of Electrical and Computer Eng<br class=3D"">
University of Rochester <br class=3D"">
201 Hopeman Building RC<br class=3D"">
Rochester NY 14627<br class=3D"">
</p>
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