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Slot in Grease Zerk #1343389 Thu Jan 23 2020 11:05 PM
Joined: May 2001
Posts: 1,347
W
Wally / Montana Offline OP
Shop Shark
What is the slot cut in the threads of a grease zerk for? Overflow when "full?"

Attached Files
Zerk.jpg (46.44 KB, 259 downloads)

1948 3/4-Ton 5-Window Flatbed Chevrolet

28 Years of Daily Driving. Now with a '61 261, 848 head, Rochester Monojet carb, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343390 Thu Jan 23 2020 11:28 PM
Joined: May 2016
Posts: 100
J
Johnny N Offline
Shop Shark
Don't really know. Maybe meant to be self tapping?


1949 gmc 1-ton
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343404 Fri Jan 24 2020 02:31 AM
Joined: May 2015
Posts: 1,779
K
klhansen Offline
Shop Shark
Doesn't look like self-tapping. I've never seen anything like that, but I have seen self-tapping and drive-in zerks. That looks like it would leak grease out alongside the threads. Not normally what you want.
Is that a new zerk or did you pull it out of something?


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Busting rust since the mid-60's
Re: Slot in Grease Zerk [Re: klhansen] #1343439 Fri Jan 24 2020 03:11 PM
Joined: May 2001
Posts: 1,347
W
Wally / Montana Offline OP
Shop Shark
It's a new zerk but I don't know when or where I got it.


1948 3/4-Ton 5-Window Flatbed Chevrolet

28 Years of Daily Driving. Now with a '61 261, 848 head, Rochester Monojet carb, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343464 Fri Jan 24 2020 08:22 PM
Joined: Nov 2005
Posts: 76
W
walterhvogel Offline
Shop Shark
When I saw this I was curious, so I looked it up. This is what I found: "vented grease fitting. Safety vent fittings have a vent slot in the threads that allow bearings to be filled without building up internal pressure." I usually look for grease to come out of the other side when I'm filling a zerk, I guess the vent is needed when there is no other side!


1947.2 Chevy Panel Truck 1 ton
1955.2 Chevy Suburban
1955.2 Chevy 6700 Bus/RV
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343471 Fri Jan 24 2020 08:42 PM
Joined: Aug 2001
Posts: 3,970
2-Ton Offline
Shop Shark
Thanks for the update Walter. I tried to look in up also.
I learned thru training, that bearings with too much grease, will get hot.
That can lead to premature failure.

Another reason is, if the bearing has a seal on the other side, such as a wheel bearing.
If it is over greased, in could blow out that seal.
These were probably used on pedestal bearings, to prevent a seal blow out.

If anyone has any more info, I would like to hear it.
Don


Of all the things I've lost in my life, I miss my mind the most!

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
More pix on Photobucket
'46 2-Ton grain truck
'48 3/4-ton grain truck
'50 2-ton flatbed
'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343474 Fri Jan 24 2020 08:49 PM
Joined: May 2015
Posts: 1,779
K
klhansen Offline
Shop Shark
I guess I can understand that, such as avoiding blowing out a seal, but you wouldn't want to use something like that on say a ball joint or tie-rod end. New grease wouldn't be able to reach the wear parts, because it would just short circuit out thru the vent slot.
But Hey, even us old timers can learn something new. wink


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Busting rust since the mid-60's
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343481 Fri Jan 24 2020 09:55 PM
Joined: Aug 2001
Posts: 3,970
2-Ton Offline
Shop Shark
Same way on spindle bearings if they had vent zerk fittings. It would sling out the grease.
Bearing buddies on boat trailer will work good if they have a dust seal to keep out dirt and water.
The extra grease blows by the seal. And makes a mess on the rim.

If they have a seal to keep in grease, the extra grease in, it can push the seal out and make a bigger mess.
Plus lets dirt and water in.

Best way to pack any bearing hub, is by hand. Boat trailers need to be inspected/packed at least once a year.
This is just my theory, so take it with a grain of salt.

Don

Last edited by 2-Ton; Fri Jan 24 2020 09:56 PM.

Of all the things I've lost in my life, I miss my mind the most!

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
More pix on Photobucket
'46 2-Ton grain truck
'48 3/4-ton grain truck
'50 2-ton flatbed
'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Slot in Grease Zerk [Re: Wally / Montana] #1343482 Fri Jan 24 2020 10:05 PM
Joined: Aug 2001
Posts: 3,970
2-Ton Offline
Shop Shark
To add some more.
Ball joints, tie rods, kingpins and any kind of bushing, needs the pressure, to get the grease where it needs to be.

Don


Of all the things I've lost in my life, I miss my mind the most!

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
More pix on Photobucket
'46 2-Ton grain truck
'48 3/4-ton grain truck
'50 2-ton flatbed
'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Slot in Grease Zerk [Re: Wally / Montana] #1344318 Thu Jan 30 2020 07:18 PM
Joined: Jan 2020
Posts: 44
D
Doc.Hall Offline
Wrench Fetcher
I have seen this on farm equipment and after market zerk's. My best guess would be to keep the area around fitting clean. May be not.


Started with a 1929 Chevy sedan when 15, moved on to various 216 & 235's one was a beautiful 1942 coupe. Primarily have Shelby's 427 AC,GT 350's etc. High performance 283 and 327 Chevy's in 1957 150 body. Model B Rochester carb. fanatic.

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