Oil flooded the crankshafthouse

[zoli]

Hi Everyone,

I'm a new member here.
I need some help.
Last season I tried to start my 93-94 model jet-ski.
GTX with a 580.7 cc engine. I found out that the 2 cycle oil flooded the crankshaft housing. I drained it, it was fixed I was able to use the jet-ski last summer. Evry time when I store for a long period of time, I disconnect the oil line from the injector pump. What is the problem now?
I want to fix it the right way.
Thank you for your help.
Zoli

 

[seadoosnipe]

Rotary chamber...

The problem isn't in your injector pump. The problem is in your rotary shaft chamber seals.

From the oil tank, you have two lines. One goes to your oil injector pump, the other to the middle of the engine, on the port side. Then, you have another coming out under the carb going back to your oil tank, connected at the top, that's the vent.

Your rotary shaft chamber houses the worm gear that drives your rotary valve. The worm gear is in the middle of the crankshaft and lubricted with your 2 cycle oil. This chamber is seperated from the pistons by a set of seals, one on the pto side and one on the mag side. It seems, from your description, that they are leaking. Your motor probably smokes too. Depending on how much oil your using from your injector tank, you may not want to fool with it. This requires you split the motor casing to repair.

If your able to ride it o.k and it's not smoking super bad, when you go to put it up, pinch off the oil line on the bottom of the oil tank that is going to the port side of your engine block. Just remember to un-pinch it before you ride. Good luck.......:cheers:

 

[zoli]

Thank you for your quick response

I'm really confused now, because when I removed the hose from the injector pump I didn't have any more problems with flooding. I left the oil system intact, did not flodded that time. That's why i'm assuming the injector's leaking.
What do you think about it?
Thank you again.
Zoli

 

[kustomkarl]

The injector pump won't seep oil into the engine cases...if it does it is the first I have ever heard of that in my 30 years of servicing watercraft. The injector pump is driven by the engine and only pumps as the engine RPM's increase. I have seen this problem before, not a lot but it happens, that the oil seals as seadoosnipe described, go bad and seep oil into the crankcase and fill with oil. The only way to repair it is to remove the engine and split the cases and rebuild the crank where the bad seals are, and reinstall it again. I would do as seadoosnipe says, and just run it till it won't start from the oil and the problem gets real bad. It will smoke and get hard to start after a while...

Karl

 

[seadoosnipe]

Line....

Look at the size of the injector lines leaving that oil pump, going to your carb throats. It would take a week for those lines to drain enough oil into your crankcase to fill it up. Plus, only one line could actually do that. One side of the carb will be closed by the rotary valve.

Why this doesn't occur when you disconnect the oil injection system....I don't know. When you say disconnect, which line are you referring to? The one going to the front of the engine, at the magneto where it goes into the oil pump, or the one leading from the bottom of the tank going to the side of the engine. Make sure of which line you are pinching off.....then, repost.

 

[zoli]

injector pump

I removed the hose from injector pump( about 5/16 dia)
it took about 2-3 month to fill up

thank you zoli

 

[seadoosnipe]

Lost?

I'm lost here in your reply. Are you premixing? Did you find the source of your leak. There hasn't been two or three months go by since you made this post. Please explain further.

 

[boudreauxm]

Zoli or anyone else who can answer
I have 2 skis one with the same problem. Im curiuos as to where the drain is located so i can drain mine and try to get it started.

Thanks

 

[seadoosnipe]

Plugs....

Take out your spark plugs and put a rag over the plug holes. Put your plug wires on the grounding lugs, then, spin the motor over till no more oil spits out of the plug holes.

If your rotary chamber seals are shot, it won't do you any good. If your able to get enough of the oil out, you may start it up and it will smoke like the dickens. But if you can continue to run it, your seals may not be in real bad shape.

 

[zoli]

flooded crankshaft house

Zoli or anyone else who can answer
I have 2 skis one with the same problem. Im curiuos as to where the drain is located so i can drain mine and try to get it started.

Thanks

If the crankshaft house is completely flooded, don't try to rev the engine with the starter. Drain it first.
You can find two 1/8 npt plug on the lower side of the engine under the carburator assembly.

 

[robin savell lloyd]

I did see that your ski does have the two plugs. I seen them in a parts list. but not all will have the plugs. as I was wandering if my engine did and it does not. :cheers:

 

[zoli]

The first time when it happened , I stored my jet-ski in the garage for winter. When I got it out in spring I found the crankshaft completely flooded. This time period was the 2-3 motnhs. I use to keep my jet-ski in a storage between October and May. When this has happened I drained it and cleaned it. I used it every weekend and I have noticed something is smoking. I took out the carburator assembly and checked the crankshaft house. Then I found about 1/2 inch oil in the bottom. I cleaned it, then I used the jet-ski again. After each use I disconnetcted the 5/16 diameter hose from the injector pump. After that I took out the carburator assembly 2or 3 times to check if the oil is still there. The crankshaft house was dry then. I was pretty sure the injector pump has to leak somewhere. Without putting the carburator assembly back I connected the oil tube to the injector pump and placed a little container underneath it. 2 days later I found about 1/4 inch oil in the little container. Ever since then, every time I ride my jet-ski I keep connect and disconnect the injector pump oil hose. The jet-sky doesn't smoke at all.