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Stihl Blower Vibration

I have an ageing BG55 handheld blower.  I have notice that the vibes have increased.  The blower fan seems ok but there are some lumps out of the engine cooling fan.  I have heard that vibration can be a sign that the crankshaft bearing are worn.   I can replace the damaged fan but I suspect that it won't be a cheap part.  Any idea how to tell if it's the fan or the crankshaft ?

I am a bit concerned whether these older machines are happy running on the new 2T stihl oil.  I have to use it for my Combi.

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  • Does it struggle to start? How old is it?
  • Would the anti vibe bushes and links not be a good place to start??
    • PRO

      I would say this is almost certainly it. Or a bolt loose on the av mounts.

      Should have no problem running on new oil the grades of oil havn't changed. Does it state 25:1? If so you should be running it on 50:1 now as the engines need for lubrication hasn't changed much, the oil being better is what has allowed 2t mix's to be weaker.

  • Our 18month old Stihl blower, did something very similar, then made a rather nasty noise, before seizing.  Investigation showed that an engine bearing had failed, casting 4 ball bearings into the engine! Although out of warranty, our dealer (Ernest Doe) sent the box of bits to Stihl, who rebuilt the engine with new cylinder, piston and bearings FOC. It is now like a new machine.

  • At least 10 years old & starts fine.  Has it got anti vibe bushes ?

    • Normally sounds rattly when crank seals are going and struggle to start maybe Bearing on fan
  • Does anyone have a link to a parts diagram ?

    • Invariably, if you type in the model + parts...... in this case, "Stihl BG55 parts" into Google images, an appropriate diagram will come up. Then, if you "visit site"...... you'll often find more details

  • Yes I tried that. Just discovered that the BG55 doesn't have anti vibe mounts.

    • This is as they're intended for the domestic market with low use. Again, search Google and you'll find the part.. http://www.lsengineers.co.uk/flywheel-stihl-part-no-4140-400-1200.h... for about £65 though as its an old machine, I'd be tempted to replace it with a better model... I use an HS86. LS engineers are excellent and have used them in the past.  The damaged fan is highly likely to be causing the problem....... a cheap solution is to balance the flywheel by removing/adjusting a fin from the opposite side of the damaged one!

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