Yet another one

rsjones · 02-22-2003, 09:56 PM

Are the lifters in the 4.0 H.O. six adjustable. Mine seem a little noisey ?

RJ

Ryan, aka: CheapXJ.com · 02-22-2003, 10:00 PM

nope.

4.0Ls are just noisy.

rsjones · 02-22-2003, 10:15 PM

Seems like it got louder after I changed the oil today. Castrol 10W30, K&N Oil filter. Outside temps in the teens and twenties. I only really hear it at idle, as the revs go up the noise seems to disapate.

RJ

Ryan, aka: CheapXJ.com · 02-22-2003, 10:31 PM

is it really loud or is it kinda faint?

The fuel injectors themselves can actually make quite a bit of noise as well..

If you've got good oil pressure, and no loss of compression in any of your cylinders, you could try adding a little ATF or marver mystery oil to your next oil change to see if it quiets anything down at all.

I wouldn't really worry about it. them 4.0Ls are famous for two things, being reliable, and being loud.

hell, from a design standpoint, it's a tractor engine, when haven't ya heard a noisy tractor?

rsjones · 02-23-2003, 03:43 PM

Well, I'd call it loud as lifters go. If it was my old chevy v-8 I's be taking off the valve covers and going at them with my feeler guage and a wrench. I didn't think of the injectors, I did just add a bottle of injector cleaner (3-M) to a full tank a gas because it seemed to be a little rough at idle.

Hmmm, we'll se i guess.

Thanks RJ...

Any thoughts of a Dick Cepek 3 1/2 inch lift for a YJ ? Just corioius...

MJMA · 02-23-2003, 03:52 PM

I have always noticed that my engine seems a little louder after I change the oil. I don't really know why either, it doesn't quite make sense. Maybe its cause the new oil is too viscious to get into all the places it needs to lubricate? I just always take it easy on the throttle until I get the motor good and warmed up.

The 4.0 is like a tractor motor! It is a heavy duty motor, made to work hard. How many motors around take 6 quarts? Not many. The high oil capacity is part of what allows it to last so long. It has to have the higher capacity for the oil to last as long as it would in a regular motor at the higher operating temps.

Long lasting reliable motors aren't the ones that are blue printed and every part on there is running at its optimal clearance tolerances. Long lasting reliable motors are ones that can run within a wide range of tolerances. As in, parts can wear and be pretty far from spec, and the thing still runs fine. That is a good motor.

It's kinda like the AK vs. M16. The AK can shoot when full of mud, where as the M16 jams. The 4.0 would be an AK and the M16 would be a blueprinted motor that blows up if you don't change the oil right on time.

rsjones · 02-23-2003, 05:18 PM

So, maybe I should use 5W/30 until summer arrives ?

RJ...

What do you usually run ? (summer / winter) ?

I live in Northern Illinois.

02-22-2003, 10:00 PM	#2
Ryan, aka: CheapXJ.com BANNED! Join Date: Sep 2002 Location: Tampa, Florida Posts: 14,931	nope. 4.0Ls are just noisy. __________________ "The law “requires” a signature on the bottom of a tax filing; yet no one can say truthfully that they understand what they are signing; if that’s not “duress” than what is? If this is not the measure of a totalitarian regime, nothing is!" -Joe Stack

02-22-2003, 10:31 PM	#4
Ryan, aka: CheapXJ.com BANNED! Join Date: Sep 2002 Location: Tampa, Florida Posts: 14,931	is it really loud or is it kinda faint? The fuel injectors themselves can actually make quite a bit of noise as well.. If you've got good oil pressure, and no loss of compression in any of your cylinders, you could try adding a little ATF or marver mystery oil to your next oil change to see if it quiets anything down at all. I wouldn't really worry about it. them 4.0Ls are famous for two things, being reliable, and being loud. hell, from a design standpoint, it's a tractor engine, when haven't ya heard a noisy tractor? __________________ "The law “requires” a signature on the bottom of a tax filing; yet no one can say truthfully that they understand what they are signing; if that’s not “duress” than what is? If this is not the measure of a totalitarian regime, nothing is!" -Joe Stack

02-23-2003, 03:52 PM	#6
MJMA Got Rocks? Join Date: Aug 2002 Location: Rehoboth, MA, USSA Posts: 9,743	I have always noticed that my engine seems a little louder after I change the oil. I don't really know why either, it doesn't quite make sense. Maybe its cause the new oil is too viscious to get into all the places it needs to lubricate? I just always take it easy on the throttle until I get the motor good and warmed up. The 4.0 is like a tractor motor! It is a heavy duty motor, made to work hard. How many motors around take 6 quarts? Not many. The high oil capacity is part of what allows it to last so long. It has to have the higher capacity for the oil to last as long as it would in a regular motor at the higher operating temps. Long lasting reliable motors aren't the ones that are blue printed and every part on there is running at its optimal clearance tolerances. Long lasting reliable motors are ones that can run within a wide range of tolerances. As in, parts can wear and be pretty far from spec, and the thing still runs fine. That is a good motor. It's kinda like the AK vs. M16. The AK can shoot when full of mud, where as the M16 jams. The 4.0 would be an AK and the M16 would be a blueprinted motor that blows up if you don't change the oil right on time. __________________ "If a law is unjust, a man is not only right to disobey it, he is obligated to do so." Thomas Jefferson

02-22-2003, 09:56 PM	#1
rsjones Trail Guide Join Date: Dec 2002 Posts: 162	Are the lifters in the 4.0 H.O. six adjustable. Mine seem a little noisey ? RJ

02-22-2003, 10:15 PM	#3
rsjones Trail Guide Join Date: Dec 2002 Posts: 162	Seems like it got louder after I changed the oil today. Castrol 10W30, K&N Oil filter. Outside temps in the teens and twenties. I only really hear it at idle, as the revs go up the noise seems to disapate. RJ

02-23-2003, 03:43 PM	#5
rsjones Trail Guide Join Date: Dec 2002 Posts: 162	Well, I'd call it loud as lifters go. If it was my old chevy v-8 I's be taking off the valve covers and going at them with my feeler guage and a wrench. I didn't think of the injectors, I did just add a bottle of injector cleaner (3-M) to a full tank a gas because it seemed to be a little rough at idle. Hmmm, we'll se i guess. Thanks RJ... Any thoughts of a Dick Cepek 3 1/2 inch lift for a YJ ? Just corioius...

02-23-2003, 05:18 PM	#7
rsjones Trail Guide Join Date: Dec 2002 Posts: 162	So, maybe I should use 5W/30 until summer arrives ? RJ... What do you usually run ? (summer / winter) ? I live in Northern Illinois.