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possible to drill hole through a roller bearing race?


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  #1  
Old 10-15-2013, 05:28:08 PM
sdowney717 sdowney717 is offline
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Default possible to drill hole through a roller bearing race?

I have this older water pump bearing and would like to drill a hole to pump grease into it.
Also was thinking if I had a hole I could put compressed air on this and pop off the outer seals.

Water pump bearing are long and the shaft is part of the bearing.
They have thin rubber seals on each end and are sealed for life. This one goes on an MCCK raw water pump onan gen and is no longer made. I have seen people listing them for over $500.
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Old 10-15-2013, 05:54:53 PM
TekNik TekNik is offline
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Default Re: possible to drill hole through a roller bearing race?

I have limited metalwork experience and some training on bearings.
But I know that bearing race steel is VERY HARD. I wouldn't try to drill it........ but I don't know if it is impossible .
If you do try, you will need a strong fixture, a strong, hard drill bit, a powerful drill press or mill, and plenty of coolant.

Even so, you might still damage the balls, and the burrs on the inside of the outer race from the drilling of the hole will possibly reduce the life of the bearing.
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Old 10-15-2013, 06:29:48 PM
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Default Re: possible to drill hole through a roller bearing race?

I have to agree. I think that's a bad idea. I understand the thought , but think it would do more damage than good. just use some really good high temp grease when you put it together! don't buy the cheap stuff, when working on automotive you get what you pay for. mobil makes some great grease! plus your seals will go out again before you bearing will. and then you should repack the bearings. just my thoughts
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Old 10-15-2013, 06:31:55 PM
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Default Re: possible to drill hole through a roller bearing race?

Can you post pictures of the pump and bearing? If they are what I think they might be, there may be a way to get a new bearing.
PT
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Old 10-15-2013, 07:04:09 PM
I like oldstuff I like oldstuff is offline
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Default Re: possible to drill hole through a roller bearing race?

Ball and needle/roller bearings are made of an alloy called 52100 spherodized. Then they're hardened to rockwell c 60-62.

The only way to drill into that uber hardness is with a carbide drill. Besides, whacha gonna do when the drilled hole puts a few little chips into the bearings. Naah, don't do it.
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Old 10-15-2013, 08:35:15 PM
sdowney717 sdowney717 is offline
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Default Re: possible to drill hole through a roller bearing race?

Ok, I decided to heck with it, I will just open it up and see what is inside.

The one side the balls have worn so I will get 12 new 1/4 inch balls from the hardware store and replace them all.

The end cap seals, I drilled a hole and pried out on one side, other side I used a heavy duty pin and punched thru the metal and pried out.

The nylon retainers simply lift out from the outer edge.

Bearing had a very slight side play maybe .003

---------- Post added at 08:30 PM ---------- Previous post was at 08:28 PM ----------

Picture of bearing taken apart.


---------- Post added at 08:35 PM ---------- Previous post was at 08:30 PM ----------

There was a green colored grease in there.
The side facing the impeller had gotten silght rust damage mostly on the balls, they are no longer like mirrors.

shiny balls measure 0.248,
rusty balls measure 0.246

what does a new ball measure? will it be 0.250?

I wonder about the side seals, any ideas?
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Old 10-15-2013, 10:20:54 PM
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Default Re: possible to drill hole through a roller bearing race?

You might try posting your question over in the Onan generator forum.
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Old 10-15-2013, 11:22:34 PM
Richard W. Richard W. is offline
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Default Re: possible to drill hole through a roller bearing race?

Quote:
Originally Posted by I like oldstuff View Post
Ball and needle/roller bearings are made of an alloy called 52100 spherodized. Then they're hardened to rockwell c 60-62.

The only way to drill into that uber hardness is with a carbide drill. Besides, whacha gonna do when the drilled hole puts a few little chips into the bearings. Naah, don't do it.
My thoughts exactly.

I have used carbide drills to drill holes in HSS lathe bits. I used carbide die drills. Also work well to drill out HSS taps. You have to have a rgid machine to do it though. A hand drill isn't going to cut it.

Richard W.
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Old 10-16-2013, 06:47:19 AM
sdowney717 sdowney717 is offline
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Default Re: possible to drill hole through a roller bearing race?

No one will be able to help so you help yourself maybe.
These AC seals will work I think. They are steel and have a tapering rubber edge.

I have to grind down the outer edge to fit inside the bearing shell
And I will smooth out the pitted shaft. Then glue them in with some gasket sealer.
Pulley side will ride tight, do you think it will wear down the rubber or the metal?
Impeller side will be a better fit.

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Old 10-16-2013, 07:46:25 AM
edward moller edward moller is offline
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Default Re: possible to drill hole through a roller bearing race?

i have purchased new waterpump bearings from a rebuilder, give them the dimensions, they have hundreds of different sizes.
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