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#4669033 - 02/17/18 07:16 PM What causes grease to leak out of grease gun?
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4785
Loc: Houston, Texas
Like say for example, the grease is red, so it will leak a red liquid out the bottom of the gun.
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#4669036 - 02/17/18 07:20 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
rooflessVW Online   content


Registered: 12/24/11
Posts: 3827
Loc: North Carolina
Grease is just oil mixed with a thickener. They separate over time. Some worse than others.
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#4669053 - 02/17/18 07:45 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1534
Loc: Alberta
Had some red synthetic grease. Warm weather would get it leaking.

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#4669062 - 02/17/18 07:55 PM Re: What causes grease to leak out of grease gun? [Re: rooflessVW]
Linctex Offline


Registered: 12/31/16
Posts: 5950
Loc: Waco, TX
Originally Posted By: rooflessVW
Grease is just oil mixed with a thickener. They separate over time. Some worse than others.


Truth.
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#4669066 - 02/17/18 07:58 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
clinebarger Offline


Registered: 12/19/13
Posts: 1834
Loc: Fort Worth, Texas
It's especially bad with cheap grease guns, I have a couple Stewart Warner-Alemite guns that don't leak much at all. At the shop we use SKF-Alemite 555-E guns.....They don't sit long enough for the grease to separate! But I'm sure they would be better than a cheaper gun.
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#4669120 - 02/17/18 08:56 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2067
Loc: Outer Banks, NC
From my experience, the cause is age and exposure to heat.
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#4669235 - 02/18/18 12:06 AM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
Nyogtha Offline


Registered: 10/13/14
Posts: 2252
Loc: San Antonio, TX
Yep thermal expansion & long term strain relief.
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#4669246 - 02/18/18 01:11 AM Re: What causes grease to leak out of grease gun? [Re: Nyogtha]
stoan Online   content


Registered: 04/27/17
Posts: 30
Loc: FL
I think it's the constant pressure from the spring. I have never had grease separate in the tube. I have some that are 20+ years old and in perfect condition, even sitting in the Florida heat. Some are a lot worse than others but they all leak eventually if left in the gun.

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#4669266 - 02/18/18 04:28 AM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
das_peikko Offline


Registered: 01/01/18
Posts: 458
Loc: San Antonio, TX
That red grease melts real easy if it gets too warm.

I switched over to the purple cartridge and no more fake blood all over the place.

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#4669360 - 02/18/18 08:04 AM Re: What causes grease to leak out of grease gun? [Re: rooflessVW]
demarpaint Offline


Registered: 07/03/05
Posts: 29567
Loc: NY
Originally Posted By: rooflessVW
Grease is just oil mixed with a thickener. They separate over time. Some worse than others.


That pretty much sums it up. In hot weather it can be worse. Some brands, I won't mention names because it isn't worth the flame war that will follow, are worse than others. Not pulling back on the plunger after using the gun can also contribute more to it as well.
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#4669424 - 02/18/18 08:47 AM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
rooflessVW Online   content


Registered: 12/24/11
Posts: 3827
Loc: North Carolina
You don't have to name names, we all know it's Mobil.

I switch whole fleet of Helicopters from Mobil 28 over to Aeroshell 22 because the Mobil leaked out of everything like crazy in the desert heat.
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#4672553 - 02/20/18 10:09 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
OilUzer Offline


Registered: 07/31/17
Posts: 97
Loc: WA
Originally Posted By: motor_oil_madman
Like say for example, the grease is red, so it will leak a red liquid out the bottom of the gun.

funny you mention red. mine leaked all over the place and was light red/ strawberry color. not sure what brand it is but I now leave it in a big bucket. I bought it to grease my truck's drivetrain since the dealer "forgot" to do it every time!

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#4672617 - 02/21/18 12:01 AM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
Cgates Offline


Registered: 09/04/17
Posts: 18
Loc: CA
The oil will separate from the thickener. Has nothing to do with the grease gun amd everything to do with the grease. When you look at product data sheets this chatacteristic is often listed. Some can have 10% separation, and others 0% separation.

2 options to combat this....one is change your grease to one that does not separate. Other option is pull the plunger on your grease gun when you store it to take the pressure off the grease.

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#4712036 - 03/31/18 04:46 AM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
billt460 Offline


Registered: 03/30/15
Posts: 4209
Loc: Glendale, Arizona
One word.... HEAT. Here in Arizona in the Summer, if you park 2 hot vehicles in a 2 car garage, the inside air temperature can easily reach 130F+. You learn real quick to store your loaded grease guns in a heavy gauge plastic bag, or else a plastic storage bin. If you don't you'll end up with a huge mess. This regardless of the type of grease you are working with. They will ALL leak under these high temperatures. Unused unopened grease in tubes must be stored inside. Otherwise the liquid will start leaking out.

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#4742722 - 04/29/18 07:36 PM Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman]
cheesepuffs Offline


Registered: 09/24/13
Posts: 498
Loc: Connecticut
My grease gun just did this to me last night and itís been stored in my cool basement the entire time with a tube of Valvoline black grease. Granted itís about five years old now, but it happened to me just due to age and definitely not caused by heat.
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