anybody had experience with Rod bearings.

cptcliffhanger · 03-10-2009, 12:36 PM

Got nothing to loose, so I'm gonna give it a shot. (So don't tell me about how it's not wrth a try, just pull the motor and replace it.)

Engine runs SOOPER. makes pleanty of power ect....

Has a rod rattle on start-up (before the journals are oiled) and can be herd with no load at certain RPM.

I'm under the imression that I can change rod bearings by removing the oil pan (engine in car).

anybody have any experience with this??? 4.0 liter 6cyl '88 4x4 manual

Stephan

mike37 · 03-10-2009, 12:42 PM

yes you can do it that way good luck
you should replace the mains also

mike37 · 03-10-2009, 12:44 PM

do your self a favor and remove the fan belt and try a cold start
just to be sure its not your Ac pump or power steering pump

cptcliffhanger · 03-10-2009, 12:47 PM

can I replace the mains at the same time??? I would like to! didn't think that would be practical.

Why would the ac or power steering pump only rattle fer the first few seconds.. I am 99% sure it's loose rod bearings.. but that doesn't mean muc.. my mechanic listened to it and IMEDIATLY said Rod bearings..

jeepfreak82 · 03-10-2009, 12:51 PM

A possibility that also comes to mind is cam noise, or possibly a lifter... Just a thought before you tear into it

mike37 · 03-10-2009, 12:57 PM

Quote:

Originally Posted by cptcliffhanger

can I replace the mains at the same time??? I would like to! didn't think that would be practical.

Why would the ac or power steering pump only rattle fer the first few seconds.. I am 99% sure it's loose rod bearings.. but that doesn't mean muc.. my mechanic listened to it and IMEDIATLY said Rod bearings..

had a buddy with the same noise and it ended up being the power steering
or AC pump I don't remember witch but every one that herd it said it sounded like a rod

mike37 · 03-10-2009, 01:03 PM

you need a small bolt that will fit snug in the oil journal
and grind the head down to the thickness of the main bearing

and grind a nice flat side on it
you will need help
bolt goes in the journal turn crank slowly it will spin the bearing out
replace new bearing the same way

cptcliffhanger · 03-10-2009, 01:08 PM

Quote:

Originally Posted by mike37

you need a small bolt that will fit snug in the oil journal
and grind the head down to the thickness of the main bearing

and grind a nice flat side on it
you will need help
bolt goes in the journal turn crank slowly it will spin the bearing out
replace new bearing the same way

pretty sure I don't understand. :-)

I will try the belt.. can't hurt..

Stephan

cptcliffhanger · 03-10-2009, 01:09 PM

I get what ur saying!!!!!! one bearing at a time with the other six mains in place.. and you can INSTALL the new bearing that way! "Inconceivable!"

mike37 · 03-10-2009, 01:10 PM

the thing is if you have a rod knock replacing the bearing probably wont fix it
you will need to resurface the journals

mike37 · 03-10-2009, 01:13 PM

Quote:

Originally Posted by cptcliffhanger

I get what ur saying!!!!!! one bearing at a time with the other six mains in place.. and you can INSTALL the new bearing that way! "Inconceivable!"

it works
that was part of my kids job on the drag boat he pits on

cptcliffhanger · 03-10-2009, 01:30 PM

Quote:

Originally Posted by mike37

the thing is if you have a rod knock replacing the bearing probably wont fix it
you will need to resurface the journals

won't fix it huh.. so really no point huh?? complete waste of time..

bearings are made of much softer metal then the crank and the case.. I was banking that the bearings would be take the brunt of it, and replacing just the bearings had a good chance of working.. I imagine they are not tooo far gone, cause it sounds pretty good for the most part.. just rattles on start up before the oil gets there..

mike37 · 03-10-2009, 01:38 PM

Quote:

Originally Posted by cptcliffhanger

won't fix it huh.. so really no point huh?? complete waste of time..

bearings are made of much softer metal then the crank and the case.. I was banking that the bearings would be take the brunt of it, and replacing just the bearings had a good chance of working.. I imagine they are not tooo far gone, cause it sounds pretty good for the most part.. just rattles on start up before the oil gets there..

don't get all huffy

just making a comment
I have no problem with you doing what you plan it wont hurt
I'm just saying it my not fix the problem

cptcliffhanger · 03-10-2009, 02:12 PM

Quote:

Originally Posted by mike37

don't get all huffy

just making a comment
I have no problem with you doing what you plan it wont hurt
I'm just saying it my not fix the problem

Not huffy!! just taking your expertise seriously.. I do hate to waste my time.. I guess I would just like to think there is a chance it would work..

Any chance??

S

mike37 · 03-10-2009, 02:30 PM

Quote:

Originally Posted by cptcliffhanger

Not huffy!! just taking your expertise seriously.. I do hate to waste my time.. I guess I would just like to think there is a chance it would work..

Any chance??

S

yes if its just bearing wear

03-10-2009, 12:51 PM	#5
jeepfreak82 Member Garage is empty, add now Join Date: Oct 2008 Location: North Carolina Posts: 199 My Photos 1994 Cherokee Engine: 4.0Litre H.O. L6 Transmission: Auto Transfer Case: '99 N.P. 231 Front Axle: Dana 30 Rear Axle: Heavy Duty Chrysler 8.25 Tires: Liberator A/T Lift Specifications: Rockin' it Stock!!! Misc Accessories: CB	A possibility that also comes to mind is cam noise, or possibly a lifter... Just a thought before you tear into it __________________ jeepfreak82 '99 Dodge Ram 1500 '94 Cherokee (The Donkey Slayer!!!) '70 Commando (the continuing project...)

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03-10-2009, 12:42 PM	#2
mike37 CF Veteran Garage is empty, add now Join Date: Nov 2008 Location: Paso Robles Ca Posts: 2,473 My Photos 1991 Cherokee Engine: 4.0 Transmission: AW4 - 4 speed Transfer Case: NP242 - "Selec-Trac" Front Axle: Dana 30 4.10 Rear Axle: ford 8.8 4.10 Tires: 31x10 ATs Lift Specifications: 3" Misc Accessories: K&N intake overhead rack with lots of lights	yes you can do it that way good luck you should replace the mains also

03-10-2009, 12:44 PM	#3
mike37 CF Veteran Garage is empty, add now Join Date: Nov 2008 Location: Paso Robles Ca Posts: 2,473 My Photos 1991 Cherokee Engine: 4.0 Transmission: AW4 - 4 speed Transfer Case: NP242 - "Selec-Trac" Front Axle: Dana 30 4.10 Rear Axle: ford 8.8 4.10 Tires: 31x10 ATs Lift Specifications: 3" Misc Accessories: K&N intake overhead rack with lots of lights	do your self a favor and remove the fan belt and try a cold start just to be sure its not your Ac pump or power steering pump

03-10-2009, 12:47 PM	#4
cptcliffhanger Junior Member Garage is empty, add now Join Date: Mar 2009 Posts: 98 My Photos 93 Cherokee Engine: 4.0 Transmission: 5 speed	can I replace the mains at the same time??? I would like to! didn't think that would be practical. Why would the ac or power steering pump only rattle fer the first few seconds.. I am 99% sure it's loose rod bearings.. but that doesn't mean muc.. my mechanic listened to it and IMEDIATLY said Rod bearings..

03-10-2009, 01:03 PM	#7
mike37 CF Veteran Garage is empty, add now Join Date: Nov 2008 Location: Paso Robles Ca Posts: 2,473 My Photos 1991 Cherokee Engine: 4.0 Transmission: AW4 - 4 speed Transfer Case: NP242 - "Selec-Trac" Front Axle: Dana 30 4.10 Rear Axle: ford 8.8 4.10 Tires: 31x10 ATs Lift Specifications: 3" Misc Accessories: K&N intake overhead rack with lots of lights	you need a small bolt that will fit snug in the oil journal and grind the head down to the thickness of the main bearing and grind a nice flat side on it you will need help bolt goes in the journal turn crank slowly it will spin the bearing out replace new bearing the same way

03-10-2009, 01:09 PM	#9
cptcliffhanger Junior Member Garage is empty, add now Join Date: Mar 2009 Posts: 98 My Photos 93 Cherokee Engine: 4.0 Transmission: 5 speed	I get what ur saying!!!!!! one bearing at a time with the other six mains in place.. and you can INSTALL the new bearing that way! "Inconceivable!"

03-10-2009, 01:10 PM	#10
mike37 CF Veteran Garage is empty, add now Join Date: Nov 2008 Location: Paso Robles Ca Posts: 2,473 My Photos 1991 Cherokee Engine: 4.0 Transmission: AW4 - 4 speed Transfer Case: NP242 - "Selec-Trac" Front Axle: Dana 30 4.10 Rear Axle: ford 8.8 4.10 Tires: 31x10 ATs Lift Specifications: 3" Misc Accessories: K&N intake overhead rack with lots of lights	the thing is if you have a rod knock replacing the bearing probably wont fix it you will need to resurface the journals

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03-10-2009, 02:30 PM