1979 1150 thunderbolt merc drive shaft

[Utt2033]

Can not get drive shaft out of lower unit any ideas

the 1150 foot the foward gear bearing puked on me and was in process of swapping gears from a 79 merc 115 that has a cracked foot

 

[racerone]

I am not there looking over your shoulder.----There is a nut on the bottom of the driveshaft , is that off ?

 

[Utt2033]

I am not there looking over your shoulder.----There is a nut on the bottom of the driveshaft , is that off ?

Yea the pinion gear nut is off and the pinion will not come off due to the foward gear

 

[racerone]

Put driveshaft in a hefty vice.----Use 2X4 to protect gear housing. and give it a bump with a hefty hammer.---As stated I can not see what you are doing !

 

[Utt2033]

Put driveshaft in a hefty vice.----Use 2X4 to protect gear housing. and give it a bump with a hefty hammer.---As stated I can not see what you are doing !

Thanks will try that tomorrow after this scratched up eye heals some

 

[Utt2033]

Thanks will try that tomorrow after this scratched up eye heals some

Have to replace bearing what if I drilled out the upper bearing without hitting shaft or gear housing?

 

[racerone]

??----Just do what you think is best.----What type of drill bit do you plan to use on this bearing ?

 

[Utt2033]

??----Just do what you think is best.----What type of drill bit do you plan to use on this bearing ?

Now I’m really confused tried looking up parts by serial on boats.net it shows a differ bearing pic is bearing that is on my 1150 thunderbolt the one I’m using the gear case and trying to get the drive shaft out

 

[Utt2033]

Now I’m really confused tried looking up parts by serial on boats.net it shows a differ bearing pic is bearing that is on my 1150 thunderbolt the one I’m using the gear case and trying to get the drive shaft out

And this bearing is the one that’s on drive shaft from the merc115 foot I cracked

 

[dingbat]

Looks to be the same bearing to me.......LM 11949

 

[racerone]

??----What drill bit are you planning to use ?

 

[Utt2033]

??----What drill bit are you planning to use ?

A small one if I decide to do that thinking about heating up the shaft and see if that won’t break something loose

 

[Utt2033]

Looks to be the same bearing to me.......LM 11949

One is flat looking from top looks as if it has ball bearings and other is a tapered roller bearing not the same

 

[Chris1956]

Mercury gearcases of different years had drive shaft bearings with the taper down as well as up. Some of these had preload pins on the driveshaft.

As far as I know the entire gearcase would interchange. I do not know if you could switch bearings between them. You may need to buy a new driveshaft bearing if the original is not compatible with the new gearcase casting.

 

[Chris1956]

Where are you located? I have an old IL6 gearcase laying around.

 

[Utt2033]

Where are you located? I have an old IL6 gearcase laying around.

Florence alabama and 2.5 hours away I found a guy who was selling off everything he had so he could move and retire from engine work so for 250 I got entire merc 850 trying to get the aggravating shift shaft now to line up

 

[Chris1956]

An 850 likely has a 2.3::1 gear ratio. Your IL6 gearcase is likely 2::1. So, you may need a new prop pitch to restore top speed.

Make sure to install the plastic piece in the midsection, so it will hold the upper shift shaft in a good place to line up with the lower shift shaft. use needle nose plier to make final correction if necessary. Rock throttle handle to mate shift shafts.

 

[Utt2033]

An 850 likely has a 2.3::1 gear ratio. Your IL6 gearcase is likely 2::1. So, you may need a new prop pitch to restore top speed.

Make sure to install the plastic piece in the midsection, so it will hold the upper shift shaft in a good place to line up with the lower shift shaft. use needle nose plier to make final correction if necessary. Rock throttle handle to mate shift shafts.

Yea I have never seen the plastic piece on any lower u it I got and got it on and other night took forever to get up on plane and pick up speed but hit 30 without trimming it out to see how fast it was dark and coming up on no wake zone reason I didn’t trim it but I have my hydrofoil on and the prop I use is a 21p and going back out tonight and see what it will do with hydrofoil and trimming it out

 

[Utt2033]

Yea I have never seen the plastic piece on any lower u it I got and got it on and other night took forever to get up on plane and pick up speed but hit 30 without trimming it out to see how fast it was dark and coming up on no wake zone reason I didn’t trim it but I have my hydrofoil on and the prop I use is a 21p and going back out tonight and see what it will do with hydrofoil and trimming it out

Ran smooth last night best it has ever planes out nice and quick max speed according to garmin was at 32. Thanks for all the input will try to remember it all

 

[Chris1956]

What size boat and what prop pitch are you using?