Sheared key & slipped flywheel (probably)
Posted February 05, 2011 - 08:53 AM
Last weekend I went out to check it out. Most I could get out of it was a few seconds of idle with choke & throttle closed. Checked spark, compression, fuel flow, carb & valves, all seem OK. After a bit of research it seems likely the problem is a slipped flywheel due to sheared key, throwing the timing off.:mecry:
I remember how hard it was to get in there to replace the ignition module a while back... am I gonna have to pull the engine to fix this? Any tips would be appreciated, thanks.
Posted February 05, 2011 - 09:06 AM
To replace the key you would have to remove the engine to get the flywheel off unless you are good with a breaker bar and a strap wrench
Posted February 05, 2011 - 12:35 PM
Access to an impact gun and the proper flywheel puller makes this a simple job if you have room to work. If not, you may need to yank the motor.
Posted February 05, 2011 - 03:19 PM
Posted February 05, 2011 - 09:20 PM
Given what you did, and what it's doing... you may not of sheared the key off, but I am willing to bet it dis-formed it and it's pushed the key maybe 1/3 to 1/2 of the key width off to one side. It's very common, and really, what the key is designed to do. That is why you NEVER exchange it with a steel key. Kind of like how you never put a grade-8 bolt in place of the sheer pins on a snow blower!
Posted February 05, 2011 - 10:03 PM
Posted February 05, 2011 - 11:14 PM
If its your first time Id say youre gonna spend a couple hours pulling the motor and popping the flywheel off to get to the key. Maybe less. Im a pretty slow worker lol
Posted February 06, 2011 - 09:27 PM
If you pull the blower cover off and then remove the nut and washer that hold the flywheel on, you "might" be able to see the keyway well enough to tell if it has slipped. The flywheel will have a clear view of the keyway, but it depends on the way the thread is cut and where the key way starts. There is a bevel just after the threads to lock the flywheel to the shaft. I think that because of this, you may not be able to see the keyway on the crank to line it up with the flywheel, but I could be wrong!
- bobl said thank you
Posted March 12, 2011 - 08:39 PM
Posted March 13, 2011 - 09:50 AM
Posted March 21, 2011 - 09:55 PM
On that adjuster, I'm wondering if some version of loc-tite could be used on the threads to keep it from slipping?
Posted March 22, 2011 - 11:13 AM
Posted March 22, 2011 - 11:20 AM
Posted March 22, 2011 - 11:28 AM
Green Loctite is a bearing retaining compound, It will take a lot of heat before coming loose. Ussually it takes a torch to get the bearing race to come out after it's been applied.
It it better or worse than the red stuff in this application?
Posted March 22, 2011 - 11:38 AM
while plowing snow. I took out the air cleaner & it ran fine.