Coupler

[Dan01543]

Hi I was wondering what would work really good to clean the splines in my engine coupler. I noticed there's alot of old grease and other stuff that's kinda hard and I wanna get them splines completely clean and re-greased before putting my outdrive back on. I have a feeling that's why I have a hard time putting my drive back on.i have a new driveshaft and when I just slide that in the coupler it goes in a little hard.so I'm thinking it's old grease that has broken down over the years and turned a little hard and now I have Resistance when slide the drive on.
Thank you

 

[Horigan]

Brake cleaner would work well, as well toothbrush on a stick.

Have you checked for proper alignment with an alignment tool? If it’s out of alignment, it would have similar symptoms…

 

[Bt Doctur]

But is more likely you have an alignment issue

 

[Scott06]

X2 on checking alignment

Why was the driveshaft replaced? If due to wear on splines coupler may be roached too

 

[BRICH1260]

You might try something like a curved dental pick taped to a dowel rod. Reach it up in there and try to break up any old grease. An occasional spray of brake fluid to further break things up and flush it out.