Mariner 30 2S Woodruff key

[HughN]

It's a long story but whilst wrestling the flywheel off my engine (1990's Yamaha-based Mariner 30 2 stroke) the Woodruff key broke.

I can't believe there is an infinite variety of sizes for Woodruff keys - is this likely to be a 'standard' size that I might find at a local engineering shop?

I know the p/n is 90280-05049-00 but considerable Googling has (so far) only found them in the US.

[bartiny]

I had the same problem, ended up making 1 out of round bar / bolt of same diameter and cut it in half finished off with a file.

[HughN]

I found some on eBay that will need a small amount of effort with some emery cloth but look ideal.

I know the key is only for alignment and the tapered shaft does the rest but I'd like to know it is there.

[bartiny]

MMM makes you wonder how they break in the first place, mine had sheared in half

Good luck with it.

[m chappelow]

Originally Posted by bartiny

MMM makes you wonder how they break in the first place, mine had sheared in half



it.

Main cause is not having the flywheel nut torqued up enough or wrong profile on the key .
Used to be common on some outboard engines when points ignition was the day , especially with someone (DiYer) that may spend hours trying to remove the flywheel without a proper puller only to be then wary of re tightening up the nut too much for fear of having the same difficulty next time .
Even though it may seem tight ,when the engine fires the shock load can cause a rattle effect that will cause the key to fracture then snap .