67 Mercury 9.8hp lower unit problem

[gmarshall43]

Hello all<br /><br />I'm working on a 1967, 9.8hp Mercury with shifting problems. I've got most of it apart except for the forward gear. The book I have said to bang it on a piece of wood and the gear should drop out. Well it aint coming out. Anybody have any suggestions?<br /><br />Thanks

 

[Chinewalker]

Re: 67 Mercury 9.8hp lower unit problem

Hi Radar,<br /> Try a little heat on the aluminum housing using a propane torch. The aluminum will expand more than the steel of the bearing that holds the forward gear and it SHOULD simply drop out. No guarantees, though...<br />- Scott

 

[DHPMARINE]

Re: 67 Mercury 9.8hp lower unit problem

Radar,<br /><br />Do you have the drive shaft and pinion gear out? This has to happen first.<br /><br />After that what you have done should have the bearing on your bench.<br /><br />You don't mean the bearing race do you?<br /><br />DHP

 

[Chinewalker]

Re: 67 Mercury 9.8hp lower unit problem

The 11-cube twins don't use a tapered bearing on the forward gear, so the race wouldn't be left behind unless the bearing was REALLY bad.<br />- Scott

 

[gmarshall43]

Re: 67 Mercury 9.8hp lower unit problem

Hey Chinewalker, the heat treatment worked. The gear and bearing came out after a few more bangs on the bench. As I checked out all the lower unit parts, I think I came across something I need to replace. Is the cross pin suppose to go all the way through the prop shaft to the other side of the clutch? This one goes about 1/4 of the way through and it looks like it did break off. If it does need replace, is this something I can get locally or will I need to go to a dealer?<br /><br />Thanks again

 

[Chinewalker]

Re: 67 Mercury 9.8hp lower unit problem

Hi Radar,<br /> Yes, the pin is supposed to be one piece, all the way through. I would think you should be able to get this part from a dealer - take the pieces of the old one with you to help match it up. Lacking that, get creative - a piece of drill rod might work in a pinch. I don't think you'd want to use anything too soft (like a nail) as it shouldn't be able to bend very easily.<br />- Scott