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<DIV>I though the whole thing was stating the obvious, no hints at actual
hazards. I particularly liked “<SPAN
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face="Times New Roman"><FONT style="FONT-SIZE: 15pt" color=#222222>it poses no
danger as long as you don't ignite the propane</FONT></FONT></SPAN>”.</DIV>
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<DIV>Jim Becker</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=soffiler@gmail.com>Stephen
Offiler</A> </DIV>
<DIV><B>Sent:</B> Tuesday, October 29, 2019 11:13 AM</DIV>
<DIV><B>To:</B> <A title=at@lists.antique-tractor.com>Antique Tractor Email
Discussion Group</A> </DIV>
<DIV><B>Subject:</B> Re: [AT] propane to detect vacuum leaks.</DIV></DIV></DIV>
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<DIV dir=ltr>If you need the information provided in Step 1, just close the hood
and walk away.
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<DIV>SO</DIV></DIV>
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<DIV class=gmail_attr dir=ltr>On Tue, Oct 29, 2019 at 12:04 PM James Peck
<<A>jamesgpeck@hotmail.com</A>> wrote:<BR></DIV>
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style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">Here
is a post outlining the procedure for vacuum leak testing with
propane.<BR><BR><A
href="https://www.hunker.com/13414896/how-to-find-a-vacuum-leak-with-propane"
rel=noreferrer
target=_blank>https://www.hunker.com/13414896/how-to-find-a-vacuum-leak-with-propane</A><BR><BR>48
years ago a man taught me how to use a vacuum gauge in diagnosing a blown head
gasket. <BR><BR>I will have to remember Stephens tip for using propane on hard
starting gasoline engines.<BR><BR>[Jack] If a bare plug wire were sparking to
ground it could light the propane torch if you moved the torch nozzle so
propane flowed over the spark. A bare plug wire itself would not heat propane
to its ignition point. The torch itself restricts the propane
flow.<BR><BR>However, the only engines I have encountered with hard to find
engine vacuum leaks are V6 and V8s where the intake manifold seals against
both the block and heads. You can’t usually see the rear manifold seals and
they do get out of place. Tractor spark ignited engines are generally straight
4s and 6s. I suspect that the use of propane to find vacuum leaks dates
to the introduction of the OHV (overhead valve) V8. <BR><BR>We did have a
flathead Ford V8 on a piece of equipment when I was a kid.<BR><BR>I once had a
pinhole leak in an anti-dieseling pneumatic damper diaphragm that I found
using a handheld vacuum device. This was on a vehicle without ECM (engine
control module).<BR><BR>[Jim Becker] I’ve wondered how often that method
accidentally finds a plug wire with bad insulation.<BR> <BR>[Jack] In the
automotive courses I took, we would use an unlit propane torch and direct the
gas flow over spark ignited engine areas of possible vacuum leaks. If the
engine speed increased, you had found the leak.<BR> <BR>[Stephen Offiler]
Anybody use propane/MAPP? Unlit torch pointing into the air box. I
use it on reluctant gasoline engines with a fair amount of success, but not so
sure about diesel. Since we're talking about gas-soaked rags or
gas-soaked air filters on diesel engines, seems like a similar approach.
<BR> <BR>.<BR>_______________________________________________<BR>AT
mailing list<BR><A target=_blank>AT@lists.antique-tractor.com</A><BR><A
href="http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com"
rel=noreferrer
target=_blank>http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com</A><BR></BLOCKQUOTE></DIV>
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