Thread: Milky White slime on PTO Piston
07-10-2010, 09:25 PM #1
Milky White slime on PTO Piston
Ok all, I have a riddle.
Take the 750 SL out for the day. Running great 6250 RPM, 52-53 MPH on DMM. Great out of the hole for this ski, good strong pull and top end. I finally think I have it dialed in.
Get home (late evening, wicked glare) and Pull the plugs to check wash, good wash pattern on all but PTO, which appears to be exagerating the blueish white light of the LED flashlight I am using. But figured it was running so well andI can see wash pattern I feel I am good.
Wait a few day, and bring it home to adjust position on the trailer. Fiddle Faddle all day and finally get to check wash and plugs with proper lighting.
Mag looks great
center look great
PTo looks milky slimey
So I pull the head and there is definalty a layer of whitish slime on the piston crown
I notice at the same time, that i do not have the drive shaft snap on cover on.
Now normally I would not think that is an issue, but I also just upgraded to Free Flow Pro F/A's.
1) Do you think head gasket leak--water intrusion
2) Water ingestion--
if water was getting into fuel or crankcase, would I not see the slime in all?
Sorry, but the pics I took didn't come out visibly.
07-10-2010, 11:08 PM #2
- Join Date
- Jul 2007
- Cedar Rapids,Iowa
Sean, I had the same on the SLT today,Pulled plugs and one is milky,Checked it because it had a miss. No doubt in mind that I have a blown head gasket,so threw a compression gauge on it,yep, about 70#. Piston top is just wet. Run a compression and you will find it's low. After season,I'm sending my heads on it to Sharps to get the O-Ring treatment done.
07-11-2010, 02:06 AM #3
- Join Date
- Oct 2006
- Cleveland OH
Definately taking on water somewhere.
Remove the head for inspection. If the gasket looks good, you can use copper spray to re-use it.
If it's bad, look for a warped head.
07-11-2010, 07:28 AM #4
Compression on all three 130#
07-11-2010, 07:45 AM #5
Thinking maybe I was sucking some water in through the Vortex F/A on the PTO.
Taking it out today, so I will re evaluate, Resealed the head and put the drive cover on
I will let you know
07-11-2010, 07:57 AM #6
Im going with splash water in the PTO FA.
07-12-2010, 10:48 PM #7
- Join Date
- Jun 2008
Watching this for updates... i have a similar water problem... only no start.... 95 SLX 780.
Compression is good in mine too.
Post back if you find anything, i'd appreciate it!
07-13-2010, 08:19 AM #8
Something between resealing the head gasket with Copper Spray and adding the driveshaft cover, my issue is gone. ran great on Sunday. Would like to ride against another SL750 to see how it compares, but ran at 6250-6300 RPM (highest I have ever seen) and 52.4MPH on DOM. Still feels like I am too big for this ski, because it does not jump from the hole, but hey I nee dto lose weight anyway.
07-13-2010, 08:38 AM #9
Check your through hull bering to make sure it is not allowing water through. Mine was letting water through, it would travel down the drive shaft to the engine coupler. After it hit the coupler it would sling everwhere, even with the cover on.
07-13-2010, 08:42 AM #10
No water intrusion, but I always seem to have a little in the hull from spins and burying the nose on slides
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