Author Topic: 372XP Air Leaks Around Carb Flange  (Read 681 times)

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Offline KilliansRedLeo

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372XP Air Leaks Around Carb Flange
« on: March 10, 2014, 10:09:51 am »
I have noticed that you can sometimes get air leaks around the plastic carb flange (HVA # 503 71 27-01). Even if the pipe (HVA # 503 96 45-02) is new or in good shape. It appears to me that the plastic flange is the problem. What appears is that the plastic gets a bow in its' surface that mates with the carb and does not force the pipe evenly against the carb to create a seal, possibly from heat or being over tightened. The intake pipe I was using was new.

I had that problem the other day, and removed the flange. Putting the mating surface on a flat surface I could definitely see that the plastic was bowed up in the middle of the flange. Fortunately I had a new one in stock that was flat and that cured the problem. This is a worry some situation since the leak could come at any time or reappear after use. Even if all parts are new.

Wondering if anyone else has seen this or has an explanation for what is going on. Just for laughs I am going to try laying the flange on a flat surface and see if I can get it to flatten out with a little heat.
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Offline aclarke

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Over tightening maybe? Maybe factory issue.  What about warming it up on a flat plate in oven?

Offline KilliansRedLeo

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Going to try warming but hard to do because the throttle cable guide gets in the way. Perhaps a little compound on a dead flat surface. Who knows.
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

Offline president

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Good tip,I,ve vac tested an old 65l
that has a leak aruond the bakelite
heat block also . I will try the flat surface
test ,thanks

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I have not seen this but I have not done a lot of work on this model or series of Huskys.
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Offline Cut4fun .

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Out of all the 362 365 372 rebuilds I did when into this series of saws. I never seen one leak between the carb and intake mount area. 

Warped, oem parts?

husky 372 IPL  http://www.husqvarna.com/ddoc/HUSI/HUSI2003_AAaa/HUSI2003_AAaa__1062604-63.pdf

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Offline 660magnum

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Seems there is a little stainless inner tapered sleeve, cone, or collar 503 43 18-01 that goes inside that plastic adapter before you bolt it up? Never had any trouble on that series. Haven't had one apart in a little over a year. Last year I was doing Dolmars and grinders.
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Offline KilliansRedLeo

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The ss ring was there!
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
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Offline tlandrum

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Re: 372XP Air Leaks Around Carb Flange
« Reply #8 on: March 11, 2014, 09:10:42 am »
I have had 100's of 372's across my bench and never seen a leak at the mounting surface of the carb unless it was over tightened.my guess is you have a bad part and its not typical of that saw.
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Offline KilliansRedLeo

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Re: 372XP Air Leaks Around Carb Flange
« Reply #9 on: March 11, 2014, 09:48:58 am »
I agree, I have done many of that series of saws over the years and have seen two with the same problem lately. Both older saws at least 1998 or older and both from warm climates, MS and GA. It appears that the flange is a cast or injection molded part so should not have a memory, other than bad parts I have no explanation.

One other thought is that I use the factory blocking plates when doing the vac/pressure test, perhaps that may be part of the problem. I have two of those tools for the carb side and tried both with the same result. Also when using the blocking plates you cannot have the ss ring in the intake pipe, so perhaps that is also part of the problem?

Terry, how is your wife doing, if I may so bold as to ask?
"When the people fear the government...you have tyranny....When the government fears the people....you have liberty"

Thomas Jefferson
1743-1826

 

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