2002 RX DI with low compression and lose hoses

[Augustoh844]

Hey guys, first of all I would like to thank you all for taking a time time to help me.
So to start of I bought a 2002 sea doo RX DI and I was told that it had a new engine and that it had a few unconnected hoses, when I took the jet ski home and tried to run a compression test on it I found out that one of the cylinders (the front one) had no compression and that the other one (back) had about 50psi on it, them I started looking for causes, took the RAVE valve out on on both cylinders there was some leaking on them, when I was checking the reed valves I discovered that there was some metal shavings on the front cylinder but didn't found nothing strange on the back cylinder. by that I new that I would probably need a top end rebuilt, then I started looking for what caused the failure.

At that point I decided to check the two hoses that were disconnected, one of them was a clear plastic hose with a quick release/connector on the middle of it, decided to look at some diagrams online and figured that that hose was the hose that connects the back side of the water channel tray to the back of the jet ski, and the second hose that I found was a black hose on the front of the engine next to the oil pump but that hose was coming from the bottom of the jet ski, and I couldn't find any unused connectors on that area, so decided to check another jet ski that a friend of mine have and we found out that at some some point someone misconnected the oil hose that comes from the tank into the connection of that black hose coming from the bottom of the engine.

So I figured that the top end has gone bad due to them running the engine without the oil mix and now I am planning into buying a new top end to put in it and I wanted to know some opinions on it and how to buy the right top end kit to put on it.

but aside that there still one more hose that I cant find where it is supposed to be, its a thing black hose coming from the neck of the oil tank and goes all the way to port side of the jet ski next to the bottom of the engine.

And again thanks for the support.

 

[etemplet]

That hose on the oil filler neck likely comes from the right side of the engine. I don't remember if it comes from the bottom of the air pump or the vent line coming from the oil chamber for the balance shaft.

If the top end is damamged you may want to consider a complete engine rebuild. Once that metal disperses around the engine little bits get everywhere. 951 DI is neither cheap nor are they easily available.

What I would check after I pulled the cylinders is the state of the bottom end. If there is a lot of metal in there, especially gray dust mixed with oil the engine is done. Good Luck.

I'm just finishing this DI and will be installing it next week. It is a 2003 GTX.

 

[Augustoh844]

Thank you for the help, I will check that side of the engine to see if I can find any fittings that are not connected and thank you for the advice! And also, is there correct way of checking the bottom end of the engine? I was planning into removing the top end and if the pistons rods and shafts are looking good I would just assume that the bottom end is good as well, is thar correct?

 

[etemplet]

The conditions you describe lead me to believe the engine needs a total rebuild. Are you planning on pulling the engine?

 

[etemplet]

I am in the process of installing my engine. I'm gonna verify the hell out of these hoses as I go. Engine has been out so long my marks are not all clear. Luck for me I have a RXDI with everything still connected. That will be very helpful.

I believe I broke the Rave Solenoid on the GTX DI, be careful with yours working around it. Those little spigots for the air hose connections break real easy and the solenoid is not easy to find. They are real proud of them too. Post some pictures of your connections... might save me from blowing up another engine.

 

[Augustoh844]

Hey sorry for the late reply I was really busy with work lately but I think tomorrow I will have time to work on it and I will be able to send some pictures, I am planning into removing the top end tomorrow and checking the cylinders and pistons to see how bad was the damage, and good luck on yours hope everything goes well[emoji16]

 

[etemplet]

Hey sorry for the late reply I was really busy with work lately but I think tomorrow I will have time to work on it and I will be able to send some pictures, I am planning into removing the top end tomorrow and checking the cylinders and pistons to see how bad was the damage, and good luck on yours hope everything goes well[emoji16]

Are you pulling the engine out of the ski?

 

[WaarrEagle]

I was cleaning up some old files tonight and came across the attached. Not mine, but I saved it for reference. I believe the small fitting on the bottom is the hose that connects/vents to the oil fill neck. If you dont hook it up, oil leaks into the hull, as shown here.

 

[Augustoh844]

Are you pulling the engine out of the ski?

I will try not to, first I will check how the cylinders are looking like and see if I can connect the missing hose on the bottom without removing it, if not I will have to, but that is something I don’t really want to.

 

[Augustoh844]

I was cleaning up some old files tonight and came across the attached. Not mine, but I saved it for reference. I believe the small fitting on the bottom is the hose that connects/vents to the oil fill neck. If you dont hook it up, oil leaks into the hull, as shown here.

That might be it, that is the only place I haven’t looked yet and there is oil on the bottom of the hull as u said.
Thank you for the help

 

[etemplet]

I will try not to, first I will check how the cylinders are looking like and see if I can connect the missing hose on the bottom without removing it, if not I will have to, but that is something I don’t really want to.

I've done two top ends in the RX hull, one DI and on Carb. You're gonna have a couple of WTF moments. Given your compression readings I can't see not doing a complete rebuild. I think you are gonna have ground up metal everywhere. Good Luck.

 

[Augustoh844]

Little update, I have opened the top end and the cylinders are looking good (as far as I know), I was expecting to find metal shavings everywhere but that is not the case.

 

[Augustoh844]

Now I think it might be the reeds on the carburetor/air intake

 

[Augustoh844]

After further look on the top end block I noticed some scratches on the sleeve and also I could see that the oil on the bottom end looks good, but I am thinking in changing it anyways before installing the new top end on it, but overall it looks good, so now I am planning into putting a new top end on it, changing the oil on the bottom end and replacing the reeds.

 

[etemplet]

As good as the cylinders look I don't see how you got "zero" compression. Good news for you though.

Zero compression usually looks like this for me. LOL

 

[Augustoh844]

I was expecting something like that, that is why I think that the problem is on the reeds, also the cylinder that got 0 compression on it looks like it never fired.
As you can see one side is clean like new, and that side os the one that got zero compression