My Briggs and Stratton 3.5 HP lawnmower squeals when I pull the cord
and start it. It will run fine for about 10 seconds until the engine
ramps up and there is a loud squeal coming from the part that rotates
when you pull the cord (Carburetor?) on the top of the engine. It
almost sounds like it is seizing up. Any clue what is causing this?
If it sounds like it is siezing up it probbaly is. Have you checked or
changed the oil?
Also, the "thing on the top" is probably your pullcord and clutch
assembly. I dont think the overrunning clutch in there would squeal
Most likely you have a rid bearing that is going/gone.
I have seen this a lot in older B&S motors. Its a cheap part and is
easy to replace if you know how.
meant ROD bearing not rid bearing.....my bad
perhaps your overruning clutch could be dried out. A simpler thing to
do before replacing the rod bearing is to take your top cover off (
there should be a few 1/2 or 9/16 bolts holding it on. Once you lift
that up (if your motor is like the one i am thinking) you should see a
square oist sticking straight up. in the top of that should be a
little plug with a tiny hole in it. You can pull that plug and try
putting a few drops of oil in there and see if that helps. Sometimes
those do get a little dry and make a little noisem but squealing after
it "ramps up" makes it sound like it is out of oil or a bad bearing
Let me know
Yeah i was thinking that after i posted...if the rod bearing was spun
and on top of the bottom one (in the cap) it might squeal a
little...but i am lening twoards the clutch..oiling them sometimes
works sometimes doeasnt....luckily they are easy to replace if need be.
Does jerking on the rope, or banging your hand on the top of the engine,
(only if moving pars are not exposed there.) stop or change the noise?
That would suggest the starter mechanism needs lubrication.
In your case, it is $20 well spent. I don't mean to sound nasty, but if you
don't know where the carburetor is, do you think you can re-assemble the
clutch and spring mechanism properly and really save that 20 bucks?
which seems odd, because if this is a pull start there has got to be
something that allows the crank to overrun the pull-cord assembly.
if there isnt one of those then this must not be one of the standard
B&S motors I have worked on...I am having a hard time understanding how
a pullstart motor would work without a clutch on the pull cord....
Same here. I suspect the motor mech is hung up on a terminology thing
or is splitting hairs. Of course there is the possibility that he
figures he can get away with it since Brian isn't up on small engines.
That engine, if a pull start, does have an overrunning clutch.
Yea, I'm not up to snuff on small engines. From a link that Bob posted
above, I gleaned this from the section regarding squeals:
"A screeching or squealing sound may be the result of worn bearings or
inadequate lubrication. This could be due to lack of oil (!!) or a
problem with the oil distribution system (pump, passages, slinger,
etc.). It could also be a problem with auxiliary mechanical parts -
power take-off, front wheel drive, or a starter clutch that fails to
This suggest to me that there is a clutch, or at least starter clutch.
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