1994 force 120 stalling issue

[foodfisher]

Re: 1994 force 120 stalling issue

I think food fisher may be right. I took the lower leg rear cover off yesterday and ran it. Fanning the smoke away and looking around the exhaust area I didnt see or feel anything. I am running a little rich on my mixture causing excess smoke and with a faulty lower leg housing gasket the smoke gets pulled right up into the cowl. The only other place it could be coming from is directly under the carbs but from looking at the diagrams the exhaust doesnt go through that area??
So anyone ever dealt with the lower leg housing gasket issue,?

Mine was depressed and disintegrating in places. I cleaned the loose stuff as best i could with a brush and filled and shaped the missing areas with silicone caulk. So far so good. Also remember someone saying they used a piece of garden hose as a substitute.

 

[SteveinVA]

Re: 1994 force 120 stalling issue

Mine is in the same shape of yours it sounds like. squished in most spots and split horizontally down the middle in the back. I am gonna try to do the same thing as you and I also have some old black water tubing left from when I replaced the livewell feed hose. gonna see what I can do with that

 

[MickLovin]

Re: 1994 force 120 stalling issue

Yea sorry it is part 45 not 1, I was looking at the leg not the gasket, but its #45 that decays over time between the head and the leg and was a problem on my 75hp 1976 model for an exhaust leak.

 

[jerryjerry05]

Re: 1994 force 120 stalling issue

#30 probably isin't the fix.
I guess #17 before #30
#27 the clamp goes bad.

 

[SteveinVA]

Re: 1994 force 120 stalling issue

I replaced 26-29 this winter, so if its not 30 or the new stuff it must be 17 (which of course is NLA) or the gasket/adapter plate between the powerhead and the ehaust tube. What about 20 /21? any one ever have an issue with this. Is it outside of the powerhead? I dont see it on my motor....

 

[MickLovin]

Re: 1994 force 120 stalling issue

#30 probably isin't the fix.
I guess #17 before #30
#27 the clamp goes bad.

After having the same issue with my 75hp and 12.9hp I am not guessing I know it was a similar part to #45,and I also had an issue with similar part #17 on my Chryslers, which were known to perish. I can actually see the gasket on my 12.9hp penetrating through the front of the motor, I can also see that it leaks around that position and comes straight into the cowl, with the 75hp it would come out around the leg. Is it a big job for you to lift the power head off? To be honest, when I found I had that problem, I sold the 75hp for parts and kept my 12.9 for some parts for my 6hp. coil etc.

 

[eng208]

Re: 1994 force 120 stalling issue

I admire your work on the hull. Impressive. That hull seems a lot different than my Rendezvous. I have a 2609. Regardless, before you put too much in that 120, have you looked at trying to find a 150 or 175? Will definitely be better performance, and you've already put a ton of work in the hull. The Force motors were not that great to begin with. Just something to think about. Older low hour 2 stroke engines are pretty reasonable and very easy to work on.

 

[SteveinVA]

Re: 1994 force 120 stalling issue

I have looked around, thing is this thing ran well with the cowl off last year, and got the boat w/the extra water weight moving pretty good. I am gonna go with this one for now.

So I lifted the powerhead off yesterday. #17 exhaust tube gasket was in rough shape, and I noticed a wet/black residue on the left side of the mating surface between the lower housing and adapter plate. The adapter plate was well sealed and bolted to the power head so i didnt remove it. The surface between the adapter plate and lower housing did not have a gasket but gasket maker was used. (I cant find a gasket on the parts fiche either). So I used some Hi temp gasket maker to hold the exhaust tube gasket on the exhaust tube and coated the housing (the area the other side of the gasket mates up to.) I then put a thin coat on the mating surface between the power head and the lower housing and bolted it all back together. Dang, that doesn't sound like I got much done in 8 hours. But it was a pain in the A--. bolts under the carbs are hard to remove with a box end when you get 1/8 turn each go at it. But , its done. Today we fire her up again... Still waiting on lower unit seals.. well not today, once I get the lower unit back on..bummer

 

[pnwboat]

Re: 1994 force 120 stalling issue

Sounds like it might have been the exhaust tube gasket. There is no gasket on the bottom of the adapter plate. It's just a bead of RTV silicone.

 

[SteveinVA]

Re: 1994 force 120 stalling issue

Alrighty, had some time yesterday so did a air pressure test on the lower unit. Had a small leak blowing bubbles on my "fill" screw (no gasket) and a small crack in my gear case cover. made a gasket for the screw and glued over the crack in the gear cover, retested once dry and I couldn't find any leaks!!! Mind you there was not alot of water in my lower unit oil to begin with, just a grey swirling when I drained it. I thought for sure my propeller shaft seals would need to be replaced, but not a whisper of air from this area. sprayed everything down with soapy water after the fixes and no air.. Does that mean I should be good to go? I have ordered a new gear case cover, other than that I should be good right?
thanks
Steve

 

[pnwboat]

Re: 1994 force 120 stalling issue

I would say so. You should be good to go.

 

[SteveinVA]

Re: 1994 force 120 stalling issue

Fired it up with the cowling on and she ran for a minute or two in the barrel. once stalled smoke was rolling out of the hand hole on the top/back of the cowl, removed it and it was smokey inside. hard to tell where its coming from or if its right without a breeze. While doing all this testing and stuff noticed one of my motor mounts was broke (rubber seperated completely from the metal. I had also pulled the beat up gasket around the lower leg and its cover and replaced it with a water hose I split length wise, sealed it up better than the old one.
If the leak is still coming from #17, I dont see how it gets out of the lower gear housing? it should be completely enclosed from what I can tell. Anyway, gonna lift the powerhead off again to install new mount once I get it, and then put a ton of gasket maker down where #17 should be along with the old gasket .
thanks for all of your replies