Start working on Stihl BR-420 blower.Cleaned carb,new spark plug and still not revving up.Pull cover off-found bad seal on bearing. Question i have do i need to take engine a part or there is way to remove that bearing.Thanks for help.Dan
Nope, the entire unit has to come apart.
The fan is a right royal bitch to get off.
Down here the shops cut it off and charge the owners for a new one.
I stuff some nylon rope down the spark plug hole to lock the crankshaft ( make sure it is coming up on compression or you will bend one of the tiny valves).
After that it is a case of hitting the nut with the oxy torch, then penetrating fluid then rattle gun then oxy torch penetrating oil rattle gun at infinitum till it comes off.
You must use a rattle gun & not a long wrench + pipe because the shaft is real easy to bend ( found that out the expensive way ) and as little as 0.0001" off axis will have the operator doing a tango standing still.
Would that seal relate to a running issue of not coming up to speed for the OP?
You can try. Can drill into the seal, screw in and pull. If your seal is all rubber(looks like it is metal) then get a pic and pull it out....only seal is bad.Can i just remove that bad seal and pop new one in ?