removing power head from 35hp Johnson

[jdupree]

Model # 35EL775 Serial # SNE4694124

We think this motor is a 1977? I don't have the manual to this motor and we are trying to remove the powerhead. Just need to know where and how the driveshaft is disconnected from the powerhead? We have broke it loose but it still feels like it must be connected in some way. The lower unit has not been removed yet. Any advice would be greatly appreciated.

Thanks!

 

[BoatBuoy]

Re: removing power head from 35hp Johnson

The drive shaft is splined and slides into a splined receiver in the crank - no fastener. Your problem may be the gearshift linkage and I'm not familiar with that. I have had the lower unit off that engine and the driveshaft simply slides out of the crank.

 

[i386]

Re: removing power head from 35hp Johnson

I recently swapped powerheads on a '69 33HP Ski-Twin. There's 2 nuts below where the carb sits. There's two bolts, one on each side of the exhaust leg/intermediate housing. They're larger than the rest of the small flange bolts. The bar that locks the timing advance when you're in neutral has to come out. That's all it took to get mine taken off.


Hopefully you've just missed something simple and will have off with no more problems. There is a grim possibility though... The o-ring that sits in a groove just below the splines in the top of the driveshaft keeps the grease from leaving the splines. If there's no o-ring or grease, it's possible that the driveshaft will rust/corrode to the crankshaft. The solution to that problem can be as extreme as having to cut the driveshaft with a torch. I'm betting you just missed something simple though. Good luck and let us know how it turns out.

 

[DJ]

Re: removing power head from 35hp Johnson

The gearshift linkage is still hooked up. Look under the carburetor for a bolt going through a rod.

You must have the lower unit off to properly reinstall the powerhead.

On second thought. Look at the midsection of the leg. Do you see a cover (rectangular shaped) with two screws holding it on. If so, remove that. THat is your shift linkage connection.

It will be one way or the other. My minds a little fuzzy on a '77'. THe last one I did was an '83'.

 

[G DANE]

Re: removing power head from 35hp Johnson

If you want to remove the powerhead, there is no need to mess with the shift rod, it goes from upper part of mid section to lower unit, leave it alone. There are 4 or 6 bolts at the back of mid section, all accesible from underneath, you dont even have to remove transom bracket. Then there is a nut on each side of powerhead, often a pain to get to, expecially if they are rusty, but with a little patience its doable. I've only had one that gave seroius trouble, and I had to spiit it with a chiesel, and be carefull not to hit cranckcase or threaded stud. If it still binds, its probably the splines in driveshaft, binding in the cranckshaft. Work it a little, its a rare problem on those. If trouble contitues, remove lover unit first, its easier to work splines from that end. 35 EL77 is a 1977 35HP, right on. Exhaust housing goes a long way down mid section, powerhead has to be lifted straight up, but you can turn a bit, it to free it

 

[G DANE]

Re: removing power head from 35hp Johnson

And DWJ, the 75 - 79 has the seperation of the shift rod beside a lilttle lid on side of mid section, the 80 - has the seperation plade behind the water intake screens in lower unit.

 

[jdupree]

Re: removing power head from 35hp Johnson

Thanks alot guys for the great info. I have removed all the bolts including the 2 nuts that G DANE mentioned. They were a pain in the rear! As DWJ mentioned there is a rectangular access panel on the leg. We did pop it off and did see a couple of screws. If we unhook those cables should the power head then lift off? Thanks alot for the info!

 

[i386]

Re: removing power head from 35hp Johnson

If we're on the same page, that little cover exposes the shift rod coupler. If one were dropping the lower unit, the bottom screw in the coupler needs to be removed. I don't know of any normal circumstances that would require removing the upper and lower screw. I didn't have to touch the shift linkage to remove my powerhead.

 

[G DANE]

Re: removing power head from 35hp Johnson

If you only want to pull powerhead, again, no need to mess with shift rod connection. If you want to pull lower unit, loosen and remove the lower bolt in the little clamp visible thru the little lid on mid section. That is on a 77 of coarse.