QuestionI am in the process of replacing the cylinder and piston on my Echo PB-410 backpack blower after it was run without oil in the gas. I've got it completely taken apart and now I've just got to make sure I get everything back together correctly. This is my first small engine work so I'm looking for any tips you can give me. Do you have any idea of the recommended bolt torques and the gap between the ignition module and the flywheel? Also, as far as inserting the pison into the cylinder - there is a slight taper going into the cylinder (it is not machined, it is cast in there) does this mean I shouldn't need a ring compressor or should I try a worm gear hose clamp like I've seen recommended. Also, any other tips you can give me to ensure success?
AnswerTorque specs are available but we just use the nominal torque for the bolt/nut thread spec. Most techs just tighten the flywheel nut with a 3/8 inch air impact.
Rarely do we torque the ignition module. Just set the air gap, about .010-.012 for most applications and tighten screws.
There should be a taper on the cylinder jug but make sure you oil both the jug and piston/ring assembly.
You can use a ring compressor if yo havea small one or a hose will work as well.
Was there any marks on the piston? Most 2 cycle engines have a mark on the piston top. The mark goes to the exhaust 99.999% of the time...industry standard practice. I always check for a mark before removing the piston.
Does any of this info help?
Eric
