05 RXP coolant loss, need help!!

[Realquiet1387]

Hey guys, new to the forums here and my ski.
Bought my 2005 rxp just a few weeks ago from a guy selling locally.
advertised it as running great... which it did.
I was unable to water test it at purchase but got it for a good price.
Here's the low down. 65 hours at purchase, supposedly never had supercharger rebuilt during his 3 year ownership of it. so before doing anything I removed the supercharger and had it rebuilt at a local sea-doo dealer. while picking up the supercharger I gave them the info on the ski and found out it was in for service 3 weeks prior to my purchasing, with a ton of issues. 1) was missing oil filter and screw to housing was loose. 2) high oil pressure at start up, low oil pressure when warm. 3) 1 cylinder down 50psi on a compression test(150psi,150psi,100psi). they changed the oil filter and plugs re tested and no more oil pressure issues.the owner did not want to spend any more money and pulled the plug.
So he neglected to inform me of this. I decided to water test it and it ran great. hit 70mph put about 4 hours on the ski and today while doing my pre inspection before riding noticed the coolant was very low. so I topped it off at the max line and rode for about 30 mins. checked and coolant level was down to the bottom again...
topped it off again to the max line and it was down 2 inches after a short 10 minute run. so I pulled it out of the water as I was afraid of ruining the motor.
she did seem to sputter a bit while putting in to load up at 5mph.
SO I took her home and pulled the seat. no coolant in the bilge and ran a compression test. each cylinder had 130psi. plugs do not look bad or wet nor are they discolored as a sign of burning coolant. Oil is nice and clean no coolant in the oil system. I didn't notice any exhaust smoke of any sort and cannot figure out why this is happening. I do how ever have little black specs in the overflow bottle. I have a feeling i will be replacing the head gasket.

 

[Coastiejoe]

The coolant could be leaking into the hull and going out the suppers (self draining system that works of the Venturi Affect).

If the spark plugs all look the same and not like they are "Steamed Clean", then I would think the coolant is not hitting the cylinders. The intercooler is cooled by the impeller and the water you are sitting in, so that is not the issue.

I would pressure test the coolant system. If it does not leak (or holds pressure), then hit the water and get it up to temp and do the test again. See if you can cause it to leak where you can see it. Pull the plugs in case it is the gasket or a crack so that you can see it is in the cylinders with a flashlight.

Also, here is an FYI for you... 2004-2006 have hollow core exhaust valves. They are filled with Sodium. It was designed to aid in cooling, but in reality, it created a weak point and the valves break. As you can imagine, if this happens there is serious engine damage.

Soooo, if you pull the head, replace the valves. If you pull the Valve Cover, the bad valves will be stamped with the number 72 on them, good valves (Solid core) will be stamped with the number 75.

 

[Tytan]

Black specs in the overflow bottle is 98% blown head gasket. Pressure test the cooling system to confirm. If you're mechanically inclined replacing the head gasket in not a difficult job, use an oem gasket and ARP head studs for a bullet proof install. If you plan on keeping the machine for a while you might as well replace the valves while you're in there here's a video we made when I did the valves on my 05 GTX:

https://www.youtube.com/watch?v=YZ6DTNwaPSQ

 

[Realquiet1387]

Hey guys, I pressure tested the system 2x. First at 10 psi then 13 psi. Held pressure and did not move in the slightest per 30 min test. So I'm still not convinced it's a headgasket. However I was alarmed when I removed my boost hoses off of the supercharger to find a nice milky/oily liquid. In the picture I attached you can clearly see there is some green coolant at the end of the hose. But why so much oil? Not sure what the heck is wrong at this point. Should I get it warm on the hose for 5 mins? And re pressure test? I'm still new to pwc's but I was a master tech for 10 years at a Chevy dealership. So my technical skills arent lacking just not used to the machines yet.

 

[Coastiejoe]

I do not understand how the SC has antifreeze in it. I cold see if it had raw water, but the closed loop cooling system does not cross the intake system anywhere that I know of. I just went through PAGES of the manual to confirm my thoughts and I still don't know how it is getting in there.

It does mention to look in the air filter area and see if it is wet or has coolant in it. And if so, replace the valves. SO,, look at the filter area and see if it is wet. If so, then I'll post the info on it.

 

[Tytan]

Hey guys, I pressure tested the system 2x. First at 10 psi then 13 psi. Held pressure and did not move in the slightest per 30 min test. So I'm still not convinced it's a headgasket. However I was alarmed when I removed my boost hoses off of the supercharger to find a nice milky/oily liquid. In the picture I attached you can clearly see there is some green coolant at the end of the hose. But why so much oil? Not sure what the heck is wrong at this point. Should I get it warm on the hose for 5 mins? And re pressure test? I'm still new to pwc's but I was a master tech for 10 years at a Chevy dealership. So my technical skills arent lacking just not used to the machines yet.View attachment 31179

Is that the hose before or after the supercharger ?

It looks like the one before the charger that connects to the intake duct that runs down the right side of the engine to the charger. Near the front of the engine is a 3/4" hose that runs from the valve cover and connects to the intake duct this is basically the PCV system and some oily residue in there is normal. The milky part might be another symptom of a bad head gasket if you are getting water in the PCV system.

Warm it up then pressure test the cooling system again.

 

[killer454]

I'm not positive on this but acording to my manual all the coolant go's through the ride plate underneath the back of the ski to cool through the intercooler.could be leaking out underneath the ski at the ride plate and just going into the lake water right.I could be wrong though I'm rebuilding my engine 05 rxt right now so I'm still learning just notice nobody mentioned ride plate under ski cools antifreeze ride plate is basically the radiator

 

[Realquiet1387]

That hose is the intake hose to the supercharger. The plastic duct that this hose connects to is wet. Also I checked the ride plate screw in the back and it is tight and leak free. I will be running the ski later today on the hose for a few minutes at a time to get it warm to re pressure test. I will add more pictures if I can to help pin point what may be going on. Like I said I pressure tested twice when cold and it held pretty well. There is a hose that connects to the plastic intake duct that looks like it cokes from the thermostat housing but I'm not positive if it's the thermostat housing. Thanks for all your help guys!

 

[Realquiet1387]

Is that the hose before or after the supercharger ?

It looks like the one before the charger that connects to the intake duct that runs down the right side of the engine to the charger. Near the front of the engine is a 3/4" hose that runs from the valve cover and connects to the intake duct this is basically the PCV system and some oily residue in there is normal. The milky part might be another symptom of a bad head gasket if you are getting water in the PCV system.

Warm it up then pressure test the cooling system

Welp ran her for 5 min on the hose and pulled the valve cover to fid the pcv hose filled with milky crap. Also the oil in the head had blotches so I think it's time to do the headgasket and head rebuild. I want to do this in the hull but the only thing I'm worried about is the timing chain. Is there a write up on someone who's done this?

 

[Tytan]

You need to get a shop manual and the crank and cam locking tools.

The rocker shaft bolts are stretch bolts and need to be replaced the head bolts are also stretch bolts and can be re used if within spec I did not risk it and used new bolts on my 05 GTX and ARP studs on a previous RXP.

I sent you a PM.

 

[XP 787]

Do a few oil changes after the job to get the milky oil out of there.