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<p>Yup.</p>
<p>Phil in TX<br>
</p>
<br>
<div class="moz-cite-prefix">On 10/29/2019 11:13 AM, Stephen Offiler
wrote:<br>
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cite="mid:CAP6upciyDqJSpV30hv0rqLD49_04jexJOUC78ey4TeYUaye20g@mail.gmail.com">
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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>
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<br>
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<div dir="ltr" class="gmail_attr">On Tue, Oct 29, 2019 at 12:04
PM James Peck <<a href="mailto:jamesgpeck@hotmail.com"
moz-do-not-send="true">jamesgpeck@hotmail.com</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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" moz-do-not-send="true">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>
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