Low compression

Joined
Apr 4, 2012
Messages
514
Location
NM
Fleet truck. 2011 1/2 ton with 5.7 hemi. >220,000 mi. Desert driving conditions with lots of dirt roads. 3000 mi OCI with a quality oil and filter air filter changed as well every 3000 mi. Air entry point maintained in good working order. Visual inspection of air cleaner looks to have plenty of life at 3000 mi. Truck went to shop and needs a new engine. Low compression. Shop say's engine dusted. What would you say the change interval of the air cleaner should be?
 
Last edited:
Joined
Sep 14, 2010
Messages
7,485
Location
S California
You could try to use a gauge to measure the delta across the element and change when it starts going up. Sound like it would be worth trouble. Also look around for air leaks in the system. Paper elements really do a good job.
 
Joined
Mar 31, 2010
Messages
5,709
Location
Iowa
Changing an air filter at 3k miles? I agree with OneEyeJack- install a gauge and change when needed. A used filter does a better job than a new one. Also less intrusion to the intake tract is a good thing- less contaminates get in. It seems to me that there have been some members that have shown a spike in silicone in their UOA's after an air filter change.
 
Joined
Aug 15, 2006
Messages
10,060
Location
Central Washington
Originally Posted By: The_Eric
Changing an air filter at 3k miles? I agree with OneEyeJack- install a gauge and change when needed. A used filter does a better job than a new one. Also less intrusion to the intake tract is a good thing- less contaminates get in. It seems to me that there have been some members that have shown a spike in silicone in their UOA's after an air filter change.
Agree. Used air filters have a higher filtration efficiency. Jim Allen talked to one of the big filter manufacturers about this and they told hims some interesting numbers, though I don't remember off the top of my head. Changing by restriction indicator allows you to change the filter only when the air flow across the filter is restricted to the point it can cause a problem. Also; who changed the air filter and can you confirm it was never 'blown out' with shop air?
 
Joined
Feb 1, 2009
Messages
8,859
Location
Texas
Shop sees a dusty dirty truck and thinks "aha! Easy sale of a new engine?" What problems sent it to the shop in the first place?
 
Joined
Jul 5, 2007
Messages
1,034
Location
SACRAMENTO, CA
He says it has "low compression". A pressure differential gauge is the best way to tell when you need a new air filter. Don't change it when it starts to show some restriction, wait till it shows around 15" of H2o restriction. That way you'll get the most out of the filter, help keep dirt out and keep the engine in top shape. I have over 85k miles on my air filter in my S2000 and I think I'll have to change it out do to age rather than to much restriction. ROD
 

yucca

Thread starter
Joined
Apr 4, 2012
Messages
514
Location
NM
The truck is probably on it's way to mexico by now. I agree with all of you who said change it less often and install a restriction gauge. I bet you can all guess what the recommendation is.
 
Joined
Aug 3, 2014
Messages
1,848
Location
FEMA Region 4
Something may have happened to the engine, but it wasn't due to your maintenance routine. Chagning the air filter element every 3k in severe condtions (such as desert operation) seems perfectly feasible in my mind.
 
Joined
Mar 31, 2010
Messages
5,709
Location
Iowa
Originally Posted By: jk_636
Something may have happened to the engine, but it wasn't due to your maintenance routine. Chagning the air filter element every 3k in severe condtions (such as desert operation) seems perfectly feasible in my mind.
Please explain the thinking behind it.
 
Joined
Feb 9, 2005
Messages
2,215
Location
Arizona
My experience with a fleet I used to manage is that, depending upon how hard they are worked, they might just be 'worn out' by that time.
 
Joined
Dec 2, 2002
Messages
6,388
Location
Washington St.
Quote:
A used filter does a better job than a new one.
To a point. At some point the dirt particles work their way through the filter media. Even worse, the filter clogs heavily and bursts open. The gauge is the smart way.
 
Top