Lost power on return to ramp screws missing from transfer port caps. 94 force 120

[wildvortex]

Upon returning to the ramp my engine power reduced drastically. As long as I kept the throttle high the engine would run. Fortunately, I was able to make it back to the ramp.

When I got home I took a quick look and there was oil everywhere on the right of the engine when looking from the back. I then noticed one of the transfer ports was missing some screws and the gasket was non-existent.

First will I likely just need to get the new gasket and find the screws put it all back together and everything be fine? If so, what is a good source for the gaskets for the force 120?

TIA,
Steve

 

[jimmbo]

Sierra Port Cover Gasket - 18-0869-9

Cross ReferencesChrysler/Force/US Marine27-F40223GLM37120Fitment InformationChrysler/Force/US Marine100 hp 1979-1984 100hp 2 stroke 4 cylinders 105 hp 1976-1983 105hp 2 stroke 4 cylinders 115 hp 1977-1984 115hp 2 stroke 4 cylinders 120 hp 1976-1992 120hp 2 stroke 4 cylinders 125 hp 1981-1989...

www.iboats.com

 

[racerone]

You could make a gasket.----Take one of the bolts ( 1/4-20NC ) to a hardware store and get some new ones.

 

[wildvortex]

Sierra Port Cover Gasket - 18-0869-9

Cross ReferencesChrysler/Force/US Marine27-F40223GLM37120Fitment InformationChrysler/Force/US Marine100 hp 1979-1984 100hp 2 stroke 4 cylinders 105 hp 1976-1983 105hp 2 stroke 4 cylinders 115 hp 1977-1984 115hp 2 stroke 4 cylinders 120 hp 1976-1992 120hp 2 stroke 4 cylinders 125 hp 1981-1989...

www.iboats.com

Thanks Jimmbo, when I went to their parts breakdown for the block it showed the gasket but when I went to the number in the parts list 43 (I think) it skipped over it.

 

[wildvortex]

You could make a gasket.----Take one of the bolts ( 1/4-20NC ) to a hardware store and get some new ones.

I believe I can find the bolts in the bottom of the case. If not that was my plan to get new. That was the simple part.
As for making a gasket I had also considered doing that. Even better for me I have a laser cutter/engraver would just need to draw the gasket in CAD.
But, if I can find it at a decent cost I would prefer the correct part and thickness. Might have found 3 last night. Iboats only has one. Crowley shows having them in stock for $5.70 each.

 

[racerone]

Problem is now solved.

 

[wildvortex]

Problem is now solved.

Yah sort of, one question not answered. Could anything else have been damaged by the lost bolts/blown gasket.
I am not so sure what the transfer ports purpose is. I am assuming it is fuel related and if so could some of that gasket material been sucked into the cylinder?

 

[jerryjerry05]

Try ebay for gaskets?
The port cove is used for inspection.
Take it off and you can see into the rings and piston cavity.

 

[jerryjerry05]

I have a snake camera that I use to check for damages in places like this.
Camera, ebay 11$

 

[wildvortex]

Oh, and even though I put in the correct part number in my search Crowley.

Try ebay for gaskets?
The port cove is used for inspection.
Take it off and you can see into the rings and piston cavity.

Thanks Jerry. So, some of that gasket could have been sucked into the cylinder?

 

[wildvortex]

I have a snake camera that I use to check for damages in places like this.
Camera, ebay 11$

Yah, I have a couple, good idea. Need to get the electronics plate off and have a look into it. Unfortunately, the gaskets I pulled up on Crowley were a different part number and for a different year. Not positive they will fit. Tried a second search and found the correct part number for $16. The two options I found on eBay have become the better option.

 

[wildvortex]

Well more research and found a good diagram of the purpose of the transfer ports.

Thanks all,
Guess problem solved now. ;-)

 

[wildvortex]

One last question. It appears to be sold in packs of two. Are these gaskets doubled on each of the transfer ports?

 

[racerone]

One gasket.-----Do you understand that your motor is a 2 stage air processing machine ?-----Air / fuel is pulled into the crankcase when piston goes towards sparkplug.------That air is compressed in the crankcase when piston moves away from sparkplug.-----That fresh air / fuel rushes into the cylinder when intake ports open.-----You lost crankcase compression when gasket failed.

 

[wildvortex]

Yes, I had figured out how the transfer ports work. I was just stumped when I was told that the transfer reports were for inspection. Figure they had to have more purpose than that.

Just wondering why sold in packs of 2 when the engine needs 3 total and Crowley shows 3 of that part needed when ordering. In fact, when I hit add to cart it automatically adds 3 packs of 2.

 

[racerone]

Many shops have DEMANDED that the factory stops selling / providing parts in quantities of ----ONE-----Too much shop time is wasted !!-----That is why parts are now sold in kits and it saves everybody some beer tokens.-----So that package should have 5 gaskets to cover the 2 , 3 , 4 and 5 cylinder motors !

 

[wildvortex]

Many shops have DEMANDED that the factory stops selling / providing parts in quantities of ----ONE-----Too much shop time is wasted !!-----That is why parts are now sold in kits and it saves everybody some beer tokens.-----So that package should have 5 gaskets to cover the 2 , 3 , 4 and 5 cylinder motors !

Would make sense but am putting in a 120 which is a 4 cylinder and states 2 gaskets. Guess I just need to order 2 packs. Have to go to the hardware store for some other projects so might just try cutting them myself with the laser.

Thanks for your help!

 

[racerone]

When I look up the 94 model 120 HP it says-=---3 gaskets required per assembly.------The people that write parts manuals may not be trained mechanics !!

 

[wildvortex]

When I look up the 94 model 120 HP it says-=---3 gaskets required per assembly.------The people that write parts manuals may not be trained mechanics !!

So true. Likely will call Crowley although they may not know either. In any case headed to the hardware store for gasket material and odds and ends. Screws likely can be recovered. But working other needed project so won't know until I dig into it further

 

[wildvortex]

One gasket coming right up!!