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Author Topic: Husqvarna 55 intake and impulse  (Read 1000 times)

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Offline Nathaniel Vansickle

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Husqvarna 55 intake and impulse
« on: December 18, 2014, 12:34:31 pm »
i need a little advice on these saws and saws with similar intake setups. i have one on the bench now getting a tuneup. New piston and ring plus fuel system and intake boot. need some tips on getting these things to seal up and pass a pressure/vac test. i cant get the intake to seal past 4-5psi. in the past i have tried 518/515 on that boot with no luck. before i assemble them i wipe the cylinder, plastic divider, and boot with alcohol to clean the oil off and act as a lubricant when assembling them. Is 5psi acceptable or should these saws hold more? i normally only test to 7psi.
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Offline Cut4fun

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Re: Husqvarna 55 intake and impulse
« Reply #1 on: December 18, 2014, 12:40:20 pm »
Did you replace the impulse seal?

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Offline Cut4fun

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Re: Husqvarna 55 intake and impulse
« Reply #2 on: December 18, 2014, 12:43:07 pm »
 Husqvarna impulse seal tube pipe 505310751



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Offline Nathaniel Vansickle

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Re: Husqvarna 55 intake and impulse
« Reply #3 on: December 18, 2014, 12:55:11 pm »
sure did. 505310751 and 503161602 are both new. the divider is not new though. i have ran into this a few times on different saws that use this style intake. it is the intake boot that leaks on them. i have used gasket sealant No.2 with success and no comebacks but wondering if there is a better way or if i am being to picky on these
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Offline aclarke

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Re: Husqvarna 55 intake and impulse
« Reply #4 on: December 18, 2014, 01:53:38 pm »
Does I hold vacuum? I don't think that "rubber band" sealing ring on the intake has enough tension on it even when new to hold much positive pressure
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Offline Nathaniel Vansickle

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Re: Husqvarna 55 intake and impulse
« Reply #5 on: December 18, 2014, 02:13:46 pm »
yep they hold vacume fine. its just pressure that is getting me. the latest 55 will hold 4-5 psi but not 7
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Offline Eccentric

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Re: Husqvarna 55 intake and impulse
« Reply #6 on: December 18, 2014, 02:32:33 pm »
If it holds vacuum fine and consistently holds 5 psi it's probably OK.  That really is a crappy intake setup.  Why HVA stuck with it through so many different saws I'll never understand.  Cheap to manufacture I guess.....
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Offline Nathaniel Vansickle

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Re: Husqvarna 55 intake and impulse
« Reply #7 on: December 18, 2014, 05:18:24 pm »
well i guess i will lower my standards on these saws and turn them loose at 5psi.
there are alot of saws that they used this or a similar setup on along with their trimmers. I have never cared for it but always managed to get them to pass a 7psi test by either just replacing everything with new or adding that No. 2 sealant to the new parts but i wondered if there was a better way. No.2 sealant is a flexible, non hardening, fuel resistant sealant but i have never felt comfortable using it. always feel like i am half a**ing it when i resort to that stuff.
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