Lubing the jet pump bearing

[Noko]

So my boat is already in storage. Yes, its sad. I did the 10hr maintenance this summer. I wasn't sure how to lube the pump bearing but was surprised to find a zerk fitting with a hose at the back of my engine. I pumped grease until I could feel the grease gun getting harder to pump. I did probably add a little too much grease to one side as the hose from the zerk fitting moved down a little. I was glad the zerk fittings were at the back of my engine because there is no way I would have been able to get to the actual bearing housing.

 

[WickedPorter]

I believe you just pump until the hose that goes down to the housing is tight/you can't squeeze it anymore ... when I did my 10 hour maintenance it was quite a few pumps, the last two years it's been 1-2 pumps per maintenance session. Others will more than likely have more technical information on this piece.

 

[Rideitout]

Going by the recommended amount of grease in the owner's manual, I used a digital kitchen scale onto which I pumped some grease and counted how many pumps it took to achieve the correct amount of grease. I then put that many pumps of grease in the bearing housing.

 

[Big Shasta]

It's actually a sealed bearing. You're just keeping the seal from drying out with the grease. I didn't know if mine had been done regularly when I bought my boat so I took the bottom of the hose off and pumped all the nasty old dried up grease out by pushing new grease through. Then hooked it back up and added a couple pumps until the hose was firm.

 

[blacksapphirez]

bought mine used at 50hrs....im guessing it has never been done before so I used multi-use marine grease on the bearing...took about 4~5 pumps. but I am going to do 1~2 pumps every 10~15 hrs as a preventative measure. wouldn't hurt

 

[prorider17]

Does anyone have a video of this being performed? I need to do this!

 

[blacksapphirez]

https://jetboaters.net/threads/yamaha-10-hours-service-in-dfw.1988/

there is a picture in the thread and just use a grease gun for the trailer wheel bearings. its same fitting

 

[ruztew]

My new 2015 sx190 doesn't have the house and is just a zerk fitting right on the housing....

 

[Cobra Jet Steering LLC]

I would be very careful when adding grease to that bearing as the fitting is on the housing now and the older ones had a hose with a fitting on them making greasing them easier but here is what can happen, the housing is bonded to rubber , that rubber keeps water from entering the boat between the housing and the seals on the driveshaft. The grease just travels through a hole drilled in the rubber between the grease fitting and the bearings, so if you pump the grease in too hard it can separate the rubber from the housing thus allowing your boat to take on water pretty fast, I am very careful not to do more than 1 or 2 pumps and then I release the pressure by pressing in the ball on the end of the hose. I put fitting and hoses back on my newer style bearings because it is a lot easier to grease them.
I think honestly adding a vent tube with a cap would be a better way to make that bearing as you could replace the grease by pumping it in and catching the old grease, plus you would get a heads up if your seals were leaking by inspecting the old grease exiting the bearing housing. I posted some pictures a few years ago on Y J B showing the rubber separating and allowing water in to destroy the bearings etc. When I replace mine next time I will add a vent tube to them.

 

[Cobra Jet Steering LLC]

Here are a few of the pictures On one I placed toot picks in the spot where the grease enters the housing and the hole in the rubber that the grease actually travels through to get to the bearing, in that picture it should be easy to see how forcing grease in can separate the rubber from the aluminum housing.

 

[Skysurfer2010]

CJS is 100% right. Adding too much is a bad thing. You're much better off under greasing them than over.

 

[dan144k]

Everytime I see this this thread I think of the pump bearing, behind the impeller, and under the cone. Different than what is being discussed.

A better description of this bearing is the drive shaft front bearing or intermediate bearing. I think, experts could chime in.

Just my opinion.

 

[Cobra Jet Steering LLC]

you are correct the intermediate bearing on the drive shaft not the pump

 

[Cobra Jet Steering LLC]

In the picture you can see that the rubber completely separated from the aluminum housing, on a good one the two are bonded together .

 

[RForester]

Thanks for posting this... I didn't realize that needed to be done, my bad. I had noticed a rattle last weekend, so seeing this post the other night rang a bell with me. I put about 12 pumps into each one. I have 50 hours on my boat and I had never had it done. It fixed the problem and is now running smooth again. Question, Han water leak into the engine compartment of the seals are not kept?

 

[Volffas]

Are these fittings on my 2007 AR230?

 

[Cobra Jet Steering LLC]

If the seals leak water gets in the bearing and the hull.
Yes the 07 has a hose behind each engine with a cap over a grease fitting this is how you pump grease in to your drive shaft bearing

 

[Ajax]

Is 2-4-c marine grease acceptable for this bearing.

 

[Big Shasta]

Is 2-4-c marine grease acceptable for this bearing.

Any marine grease should be fine.

 

[SpotsyBoy]

pump bearing, behind the impeller, and under the cone. Different than what is being discussed.

A better description of this bearing is the drive shaft front bearing or intermediate bearing.

I'm looking to grease my boat for the first time. Bought a used '10 AR240 this summer w/ 129 hrs. Put 30 hrs myself. Engines sounded a little "rattly" this past Saturday. Hoping/guessing just needs to be greased.

I'm guessing the housing/intermediate bearing is the one on the engine. Problem is I have no idea how many pumps to put in it. I winterized myself today and have already removed the batteries. 1) is it okay to grease housing bearing w/o running it 2) have no idea how many pumps to put in it-read several posts saying not to overdue it b/c it may break the seal.

Also, how do I grease the cone bearings? Is there a separate connection for it? If so, can you tell me where its located?