1984 johnny 115, how far do the 6 powerhead mount bolts back out?

[rothfm]

Looking for someone that has removed these crossflow Powerheads before.

I'm beginning my first powerhead rebuild..I go slow and careful not to break anything, I'm good at getting old crusty bolts/screws out too. The 6 long bolts (3 per side) were tight, Had to apply heat/cool....But they all did back out about 1" to 1 1/4" THEN JUST SPIN.

My thought was the bolts unscrewed downward from the powerhead threaded portion ok,,,and now are just spinning in the Exhaust adapter housing due to the old corrosion.

I cant really get under the lower cowl to tap downward on the bolt heads to see if they will come out fully...If I have to fully take them out of the Exhaust adapter I will have to come up with some thing to go over the bolt that will extend down with a "L" lip that i can tap with a hammer.

Else, If these bolts are truely free of the powerhead threads, I will resume my next step--Lifting the PH off.

Has anyone done this that remembers how far these bolts come down when free from the powerHead as a guage for me??

Thanks

Mark

 

[emdsapmgr]

Re: 1984 johnny 115, how far do the 6 powerhead mount bolts back out?

Those 6 bolts are about 5 1/2" long. They probably thread about 5/8" into the powerhead. Once they freely turn, they normally just fall out of the exhaust adapter. It's unusual for them to stay in the adapter once they are free. It is not a problem to leave them in when you remove the powerhead-as long as they are fully unscrewed. Keep in mind there are two nuts and two bolts that must be removed from the front of the exhaust adapter. Also, 2 more nuts at the back of the powerhead before it will be free to lift off of the adapter.

 

[rothfm]

Re: 1984 johnny 115, how far do the 6 powerhead mount bolts back out?

Thanks Emdsapmgr, I read your posts alot....I figured I had them out of the PH portion but wanted to check. Before replying, I ensured the rest of the bolts were out. The Prior owner already had broken off 2 apparantly. Lifting the head all but one corner seperated fine, but now its stuck on a corner bolt thats right near the Tstat housing. Lifting it up a little I'm afraid I may have slightly bent whats left of that bolt. The PH moves on the remaining shaft side to side, but wont seperate. Now, I've got to figure how to seperare this or possible get a blade in there to cut it and deal with it later on the bench. Rggg


Thanks

 

[emdsapmgr]

Re: 1984 johnny 115, how far do the 6 powerhead mount bolts back out?

I'm assuming your bent rear corner bolt is one of those long bolts. If it's bent and won't unsccrew, one solution is to saw it apart. I'd probably lift the engine as high as possible so that when you cut the bolt there is enough stub left in the powerhead that you can get a set of vise-grip pliers on it to turn it out. You should be able to get a replacement bolt 328698 from any Bombardier dealer.