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Service & Maintenance Question

    David Sell
    I am replacing a crankshaft on a Husqvarna 345. I am using...Answeredescalated
    Service & Maintenance Question posted December 29, 2011 by David Sell, last edited February 10, 2012 
    1190 Views, 2 Comments
    Question:
    I am replacing a crankshaft on a Husqvarna 345. I am using ThreeBond 1194 sealant on the crankcase halves. I have done this five times and the crankcase fails the air pressure test as defined in the work shop manual every time. It leaks in the same spots every time, where the brown Viton bearing/seal meets the plastic crankcase and aluminum cylinder. The seals do not leak around the crankshaft. I tried the seals/bearings from the old crankshaft and new-used crankshaft, same results. The last time I allowed the sealant to cure 24 hours in front of my fireplace before I tested it. Do the seals have to be thrown away after they have been torqued? Is it not possible to use the old seals? Both saws have had little usage. Is it the wrong sealant?

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    Best Answer

    Greg P.

    Thanks for contacting Husqvarna.

    We use a sealant part number 503267201. This is used for crankcase sealing. You should check the bores and flatness incase heat wrapped the cylinder.

    The cover plates should be changed also. These sit in the half moons of the cylinder.

    Hope this helps.

    Answer

     

    • Greg P.

      Thanks for contacting Husqvarna.

      We use a sealant part number 503267201. This is used for crankcase sealing. You should check the bores and flatness incase heat wrapped the cylinder.

      The cover plates should be changed also. These sit in the half moons of the cylinder.

      Hope this helps.

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    • robert smith

      one also must be especially careful when scraping the casing halves to remove old gasket. you should always have a scraper wide enough to rest on two points of contact as you remove gasket. this practice will not allow you to round over edges of casing halves.

      after gasket removal, then use a straight edge to prove the mating surface is true. any high spots should be lightly filed to improve a perfected joinery.  the vaccum will hold at a constant value if and only if, strict attention to detail has been paid during the preparation of mating surfaces.  this is one of the common issues I resolve with a crank replacement.

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