1989 Johnson GT150 - sheared flywheel key question

[KKNOPP26]

Hey all, flywheel key on my 1989 johnson was sheared....luckily took less than a day to get it all apart!

i am now installing a new key, how do i know if the key is in far enough / properly seated?

after seating the key, how do i know if the flywheel is seated properly?

my reinstall procedure was as follows:

i put the key back in, parrallel to the shaft. tapped it gently with rubber mallet. next i dropped the flywheel back into place and threaded a new flywheel nut back on. hand tightened, ratchet tightened, the proceeded to put the boat in gear and block the prop with a 2x4. broke out a 1/2inch toque wrench set to 140 foot lbs torque..... pulled till it clicked.

is this all i need to do to avoid shearingthe woodruff key again? last time i replaced a blown timer and sheared the key bc i didnt use a torque wrench.... nor bothered to tighten it down that far. had no idea about that

thanks for any input!

 

[interalian]

Did you buy an OE key? Inspect the tapers for any burrs? Lap the tapers with valve grinding compound to get a good surface in the event there are any burrs/scoring from when it sheared. You need an intimate connection between the crank and flywheel for a proper fit. The key is only there for alighment, the tapers take the forces during operation - that's why the key sheared when the nut was too loose.

 

[KKNOPP26]

i did buy an oe key, heard some other replacements wouldnt hold up..... as far as inspection, i did not notice anything obvious. i cleaned the tapered are of the crank shaft and the flywheel hole. I believe 140 foot lb of torque is called for in the manual, and to my best ability and knowledge it has been tightened very close to that

 

[Tim Frank]

Do you have the manual? Reason I ask is that I have 4 O/Bs and two require the key to be installed with the exposed face parallel to the C/L of the crankshaft....the other two are to be parallel with the taper.
No idea why....or whether it matters, but I always follow the instructions.

All that to say, if you DON'T have the manual, wait to hear from someone who does.

 

[racerone]

You need to lap the tapers with some grinding compound!!----Note----The flywheel is driven by the locking tapers when there is a proper fit.-----As always there will be a difference of opinion and understanding of how this works.

 

[KKNOPP26]

I do have a manual, it has the flat side of the key parallel to the crank in one chapter but reversed in a following chapter. i reinstalle dthe new one as the previous key had been placed (flat side parallel)

I will coat the surfaces with grinding compound after work and tighten it down, Thanks!

the flywheel staying in place is done by the flywheel nut holding(pushing) the flywheel far enough down the taper to ensure it stays put, correct? just trying to understand

 

[interalian]

No, don't put the grinding compound on and tighten it down!

Apply the grinding compound to the tapers with the key out, then rotate the flywheel on the crank until the faces are perfectly smooth. Re-apply the compound as required. Once you have a perfect mate, you must scrupulously clean the mating surfaces before fitting the new key and torquing the nut.

 

[KKNOPP26]

Interalian, Thank you for the reply! I did excatly as u said, went to a buddies shop and he instructed me in that before i reinstalled