How to grease a bearing without overfilling
How to grease a bearing without overfilling
(OP)
I have a connecting rod designed with a plain spherical roller bearing with both sides sealed with a shaft seal. In the con rod I have a grease fitting for applying grease once the con rod is installed on to the crankshaft. normal amount is around 20 manual pumps.
My concern is that during greasing, the air trapped inside the conrod housing creates excess pressure and pushes the seal out of the housing.
Is there a way to remove the air pockets while the bearing is being greased? Also is there a grease fitting available that will prevent excessive greasing?
My concern is that during greasing, the air trapped inside the conrod housing creates excess pressure and pushes the seal out of the housing.
Is there a way to remove the air pockets while the bearing is being greased? Also is there a grease fitting available that will prevent excessive greasing?





RE: How to grease a bearing without overfilling
As for removing the air, you could evacuate the grease reservoir prior to initial greasing. It's probably simpler to provide a bleed; a second channel opposite the grease fitting, equipped with a plug that you loosen or remove while injecting grease, to vent air or old grease.
Mike Halloran
Pembroke Pines, FL, USA
RE: How to grease a bearing without overfilling
20 strokes on a lever hand pump is a lot of grease for a bearing system. As stated above normal hand operated grease pumps are capable of significant pressure so you might want to consider a lower pressure pump.
Can you come back with a little more details of your bearing.
http://www
RE: How to grease a bearing without overfilling
Thanks
RE: How to grease a bearing without overfilling
Appreciate the information.
Just a question, What do the seal lips run against?
The twenty strokes on the grease gun indicated to me that it was small volume per stroke high pressure system. This was the reason for my question.
Watch your grease selection with your setup.
RE: How to grease a bearing without overfilling
I am afraid that the grease will begin to leak through the relief valve before it begins to fill the cavity.
RE: How to grease a bearing without overfilling
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Russell Giuliano
RE: How to grease a bearing without overfilling
With this configuration even getting a vent plug to function is going to be a problem.
RE: How to grease a bearing without overfilling
RE: How to grease a bearing without overfilling
For axial guidance Moderately unusual at the wrist pin end as shown here - htt
pretty typical at big end as shown here -
http://www.ellweinengines.com/ERE15/windage2.jpg
lubrication will require some thought, although life is a little easier at the pin end where motion is << 90 degree oscillation instead of continuous rotation, which is part of why high revving 2-strokes used the pin guided instead of crank guided
RE: How to grease a bearing without overfilling
http://www.uesystems.com/prod_up_201.asp
I came across this device during some vibration training at our company. It allows ultrasonic "listening" to the grease entering a bearing and is supposed to prevent over-greasing.
Maybe it has some merit? I have no experience in this regard.
RE: How to grease a bearing without overfilling
Why is the crankpin so very long?
Mike Halloran
Pembroke Pines, FL, USA
RE: How to grease a bearing without overfilling
The crank is long to accommodate extra con rods. Do you have an example of a cheek on the crank?
Thanks
RE: How to grease a bearing without overfilling
No matter. The 'cheek' is a radial surface that's located near a normal crank's crankpin. In a built-up crank, the cheek may be just the face of a plate or counterweight. In a single piece crank, cheek may refer to the radial ground bearing surface adjacent the crankpin, or to the forged or cast surface that's nearby and mostly parallel to that radial surface.
In your case, you could press or clamp some sturdy rings (like a con-rod's big end without the rod) on the cylindrical surfaces adjacent the bearing, so the con-rod can twist a few thou, but no more.
Mike Halloran
Pembroke Pines, FL, USA
RE: How to grease a bearing without overfilling
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Russell Giuliano