question about little nipple on throttle body...

[Carboncow]

2007 C180 with 85 hrs.

OK. After running my boat for the first time I noted a little oiliness on top of the filter housing. Maybe it's an oversight by me but as I was researching I noted there is a brass nipple on the throttle body point right at the filter housing. Did I forget to put something back on here or does that nipple vent to atmosphere or nowhere? Ran perfect.

Here's a generic photo I found on the internets...looks like the right TB and the nipple highlighted...

 

[Sportster-2001-951C-Stock]

Yes, I'm sure there should be something there, is there no hose/tubing in the vicinity that should connect to this nipple? Maybe from the oil fill pipe?

 

[Beach81959]

I believe there is a small hose that connects to the spark arrestor/air cleaner assembly

 

[Carboncow]

Yes, I'm sure there should be something there, is there no hose/tubing in the vicinity that should connect to this nipple? Maybe from the oil fill pipe?

I don't see a lonely hose in the area. I pulled the OEM air intake and have it on my bench and see nothing that attaches to it nor does the parts show anything.

This most likely will explain why my boat had a fine mist of oil coating about EVERYTHING in the engine bay. I had to take a power washer to the engine bay when I bought and scratched my head to why it was so dirty with no visible signs of leakage and spill from the engine. I think my uncovered nipple has been running wild! My guess is (assuming the oil is from the nipple) this hose has been off since day one...it was that dirty.

Looking at the parts list I do see a nipple on the intake as you described so will research that. Anyone got an eyeball on their boat/ski and this intake and where it goes?

 

[Sportster-2001-951C-Stock]

Yep, that's the nipple I was thinking of. Can't say what really is supposed to attach on the carb there although I should know.... Ugh, sorry... I guarantee there should be something. And there should be a pressure sensor attached to that location on at least one of the throttle bodies I think.......

This intake nipple would be a logical place to attach an oil mist-spitting vent hose from the crankcase.

 

[Carboncow]

So the crank case spits oil into the intake which hits the SC and goes back into the engine just to be spit out again, I wonder why. I wonder why it just wouldn't have it go into the combustion chamber...to much oil in there?!?!

Worth noting I took off the OEM and have a catch can now to keep oil out of the SC and intake...so I may see this diminish the spray. I wonder if someone took it off prior to me or the factory forgot it.

Will get this figured out.

Hopefully others chime in to get me pointed in the right direction.

 

[Sportster-2001-951C-Stock]

If the crankcase vents to the air intake, that air does go to the combustion chamber where the oil mist is consumed in combustion. Normally this is how marine crankcases are vented, not into the bilge or a maintneance-intensive catch can.

The problem occurs when engine is worn out or filled with sludge in the top end, which interferes with drainback, the amount of vapor mist becomes excessive, to the point plugs foul and even detonation can occur.

Keep looking, maybe some vented cover or venting hose nipple was removed at some point in favor of something else.

 

[Carboncow]

OK...just stared at 1001 images. I learned there are several variations on this engine and that there are not many good high def photos! I came up with one image that clearly shows the line and that it runs around the starboard side...beyond that who knows! I'll double up on my efforts in that area.

I noted a few don't have the throttle body in that area, others don't have the nipple there...

any chance I can just block it off if I"m not injecting oil into the intake anymore or will it mess with the TB and it's calcuations?

If anyone with the same engine/year range wants to take a look...I'll buy the beer!

 

[pvamax]

Are you sure that nipple on the tb is even drilled thru? Reason being, if it is, you would not build any boost as it would leak air out there constantly.

 

[Carboncow]

Are you sure that nipple on the tb is even drilled thru? Reason being, if it is, you would not build any boost as it would leak air out there constantly.

I would agree with that but there is clearly a spray pattern on the top of the oil filter casing...I'll double check if I can tell if it's open or not...but I"m about 93.4% sure that oil appeared to be directly from the direction of that nipple!

 

[Asecilop]

I have to double check mine, but pretty sure mine is not connected to anything and I ended up putting a rubber nipple on it.

 

[Ubiquity]

2007 C180 with 85 hrs.

OK. After running my boat for the first time I noted a little oiliness on top of the filter housing. Maybe it's an oversight by me but as I was researching I noted there is a brass nipple on the throttle body point right at the filter housing. Did I forget to put something back on here or does that nipple vent to atmosphere or nowhere? Ran perfect.

Here's a generic photo I found on the internets...looks like the right TB and the nipple highlighted...

View attachment 35134

On my speedster this nipple has approx 18-24 in hose that terminates in a yellow plastic capped fitting that passes through the plastic engine cover. It is used to periodically lube/clean the throttle body with seadoo lube.

 

[Ubiquity]

On my speedster this nipple has approx 18-24 in hose that terminates in a yellow plastic capped fitting that passes through the plastic engine cover. It is used to periodically lube/clean the throttle body with seadoo lube.

Just looked at the engine photo you posted and the through fitting where it connects to is clearly visible at the top of the photo. On top of the engine cover there 2 things that are yellow- one is the dipstick the other is the fitting in question.

 

[Asecilop]

Just got home and looked over the operators manual. Ubiquity is correct. It is a lubrication fitting and is supposed to have a plastic cap.

 

[Carboncow]

Thanks guys. What is the XP-S and what is the real world equivalent that is a spray? Is that like WD30 or more a carb cleaner? How often?
What do you recon it lubes, the butterfly pivot?

I'm still saying it must pick up a little pressure to spray the engine some but not enough to to blow out the plug?

 

[Ubiquity]

Thanks guys. What is the XP-S and what is the real world equivalent that is a spray? Is that like WD30 or more a carb cleaner? How often?
What do you recon it lubes, the butterfly pivot?

I'm still saying it must pick up a little pressure to spray the engine some but not enough to to blow out the plug?

Seadoo xps lube is best it cleans and lubes, but any commercial fogging oil will work. Don't use wd-40(primarily moisture displacer) or carb cleaner(pure solvent)

 

[Asecilop]

 

[Carboncow]

I found this post. Does sound like it may get into intake a bit: http://www.seadooforum.com/showthread.php?1138-Sea-Doo-4-TEC-throttle-body-lubrication

 

[Carboncow]

I do have lots of fogging oil from bigger boats and I would agree it should lube and clean well. Looks like 10 hrs is the recommended time frame. I'll see if I have that hole in engine cover, I know there is no hose.

 

[pvamax]

Your engine bay was coated with light film of oil because the previous owner properly kept corrosion at bay by using a corrosion protectant spray all over the motor. If salt water usage this should be done after every trip. No salt, i spray light coat every few times using the boat. And no wd40, it's more of a degreaser.

 

[Sportster-2001-951C-Stock]

I didn't realize this motor is of the SC variety. Yes you can and should cap that off, if you want to squirt some oil in the fitting fogging oil will work just fine, stop if you see smoke.

 

[Carboncow]

Maybe but we are freshwater and I think it looks more like an issue the an preventive attempt. With that said I doubt this little nipple could have done that much "fogging" of my engine bay.

 

[pvamax]

You wouldn't see 7800+ rpm if it was leaking there. I'd still cap it.

 

[Carboncow]

You wouldn't see 7800+ rpm if it was leaking there. I'd still cap it.

Agreed. I think it just lubes the butterfly which has a very small amount of blowy that is easily stopped with a little cap.

I'd be curious how my tug it takes to open the OEM port on top of the engine cover.

 

[Coastiejoe]

Isn't this the nipple that's connected to a tube that runs up on top of the plastic engine cover? In the picture a few posts up, it is the yellow capped nipple on the plastic cover. It allows you to lubricate the TB easily.