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What causes grease to leak out of grease gun? #4669033
02/17/18 08:16 PM
02/17/18 08:16 PM
Joined: Nov 2009
Posts: 4,977
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,977
Houston, Texas
Like say for example, the grease is red, so it will leak a red liquid out the bottom of the gun.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669036
02/17/18 08:20 PM
02/17/18 08:20 PM
Joined: Dec 2011
Posts: 4,882
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,882
North Carolina
Grease is just oil mixed with a thickener. They separate over time. Some worse than others.


"Zed's dead baby, Zed's dead."
Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669053
02/17/18 08:45 PM
02/17/18 08:45 PM
Joined: Dec 2017
Posts: 2,501
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,501
SE British Columbia, Canada
Had some red synthetic grease. Warm weather would get it leaking.


If you want the job done right......do it yourself.
Re: What causes grease to leak out of grease gun? [Re: rooflessVW] #4669062
02/17/18 08:55 PM
02/17/18 08:55 PM
Joined: Dec 2016
Posts: 6,429
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,429
Waco, TX
Originally Posted By: rooflessVW
Grease is just oil mixed with a thickener. They separate over time. Some worse than others.


Truth.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669066
02/17/18 08:58 PM
02/17/18 08:58 PM
Joined: Dec 2013
Posts: 2,281
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,281
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.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669120
02/17/18 09:56 PM
02/17/18 09:56 PM
Joined: Jul 2013
Posts: 2,231
Outer Banks, NC
NormanBuntz Offline
NormanBuntz  Offline
Joined: Jul 2013
Posts: 2,231
Outer Banks, NC
From my experience, the cause is age and exposure to heat.


2017 Honda Odyssey SE, 16K
2013 Honda Accord LX, 58K
2007 Honda Ridgeline RTS, 88K
2007 Infiniti M35, 107K
Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669235
02/18/18 01:06 AM
02/18/18 01:06 AM
Joined: Oct 2014
Posts: 2,428
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,428
San Antonio, TX
Yep thermal expansion & long term strain relief.


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: What causes grease to leak out of grease gun? [Re: Nyogtha] #4669246
02/18/18 02:11 AM
02/18/18 02:11 AM
Joined: Apr 2017
Posts: 43
FL
stoan Offline
stoan  Offline
Joined: Apr 2017
Posts: 43
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.

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669266
02/18/18 05:28 AM
02/18/18 05:28 AM
Joined: Jan 2018
Posts: 534
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 534
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.

Re: What causes grease to leak out of grease gun? [Re: rooflessVW] #4669360
02/18/18 09:04 AM
02/18/18 09:04 AM
Joined: Jul 2005
Posts: 30,608
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,608
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.


God Bless Our Troops

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4669424
02/18/18 09:47 AM
02/18/18 09:47 AM
Joined: Dec 2011
Posts: 4,882
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,882
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.


"Zed's dead baby, Zed's dead."
Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4672553
02/20/18 11:09 PM
02/20/18 11:09 PM
Joined: Jul 2017
Posts: 382
WA
OilUzer Offline
OilUzer  Offline
Joined: Jul 2017
Posts: 382
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!

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4672617
02/21/18 01:01 AM
02/21/18 01:01 AM
Joined: Sep 2017
Posts: 33
CA
Cgates Offline
Cgates  Offline
Joined: Sep 2017
Posts: 33
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.

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4712036
03/31/18 04:46 AM
03/31/18 04:46 AM
Joined: Mar 2015
Posts: 5,147
Glendale, Arizona
billt460 Offline
billt460  Offline
Joined: Mar 2015
Posts: 5,147
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.

Re: What causes grease to leak out of grease gun? [Re: motor_oil_madman] #4742722
04/29/18 07:36 PM
04/29/18 07:36 PM
Joined: Sep 2013
Posts: 582
Connecticut
cheesepuffs Offline
cheesepuffs  Offline
Joined: Sep 2013
Posts: 582
Connecticut
My grease gun just did this to me last night and its been stored in my cool basement the entire time with a tube of Valvoline black grease. Granted its about five years old now, but it happened to me just due to age and definitely not caused by heat.


2008 Honda Accord Coupe V6
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