Scored Bearing Insert

[BotakBeng]

In the middle of replacing my RMS and these are my little problems....

It does look pretty bad.
What should i do? (Crankshaft looks fine....in my limited experience)

PO must screwed this up big time.....how do i remove the RTV?

Thanks in advance everyone!

 

[cruiser54]

Pocket screwdriver to remove RTV from cap. Need a better shot of the bearing.

 

[BotakBeng]

Pocket screwdriver to remove RTV from cap. Need a better shot of the bearing.

Thx for the reply cruiser, my camera won't let me take any closer shots.
Can you try enlarging the pics pls?
Here are the links,
http://i1211.photobucket.com/albums/cc425/HEM2008/99 XJ/BearingInserts2.jpg
http://i1211.photobucket.com/albums/cc425/HEM2008/99 XJ/BearingInserts1.jpg

Thx.

 

[cruiser54]

Photo needs to be of a straight shot of the bearing wear surface with no glare.

 

[BotakBeng]

How about this?

A little update on my rig,
1999 Cherokee with 147k mile
Low compression through out all cylinders,
..... Dry ...Wet
#1.. 72...90
#2.. 78...90
#3.. 75...89
#4.. 81...92
#5.. 81...90
#6.. 90...86

 

[cruiser54]

Better. Is it all copper colored with no silver left?

 

[BotakBeng]

Better. Is it all copper colored with no silver left?

Nah, all silver....it was the lighting.

 

[cruiser54]

Seen better and seen worse. Looks like something got into it. Just noticed your compression numbers. It runs?

 

[BotakBeng]

Seen better and seen worse. Looks like something got into it. Just noticed your compression numbers. It runs?

In my limited experience....it runs great.

 

[cruiser54]

Maybe you should check the compression with another tester. Put it back together and run it unless you feel like putting main bearings in it while it's torn apart.

 

[BotakBeng]

I did with 3 different testers from 3 different stores :banghead:.

Should i replace the bearing inserts or would it be just fine? Didn't see any groove on the crankshaft tho.

 

[cruiser54]

At this point with the low compression and the fact that the rings are probably shot, I'd put it back together.

FWIW, did you hold the throttle wide open for 5 revolutions when checking compression?

 

[BotakBeng]

At this point with the low compression and the fact that the rings are probably shot, I'd put it back together.

I think i'm just gonna do that.

FWIW, did you hold the throttle wide open for 5 revolutions when checking compression?

Yeah i did.

I am just gonna put everything back together and drive it till i need a rebuilt engine.
Pls stop me if you/anyone think otherwise.

Thank you.

 

[cruiser54]

I ain't stoppin' ya. Go for it.

 

[BotakBeng]

I ain't stoppin' ya. Go for it.

Are you saying i should replace the bearing inserts?

 

[kastein]

unless you feel like putting new bearing inserts in it, I'd just slap er back together and run it. Assuming those compression numbers are accurate it's going to need a new motor or a rebuild eventually anyways. Bearing set will be like 40-80 (depending on whose you get and what bore it is) so it's really a decision only you can make. How was the oil pressure before you pulled it apart? Is it bored over/undersize or standard? Any funny knocking noises?

Make sure you put the bearing cap(s) on the same places they came off of and torque with a torque wrench, whether you replace the bearings or not.

It looks to me like some dirt just managed to get in, or the PO managed to get grime on the crankshaft/bearing cap when he did the RMS. If the others all look fine I'd probably just run it, if they look the same I'd likely replace.

 

[BotakBeng]

unless you feel like putting new bearing inserts in it, I'd just slap er back together and run it. Assuming those compression numbers are accurate it's going to need a new motor or a rebuild eventually anyways. Bearing set will be like 40-80 (depending on whose you get and what bore it is) so it's really a decision only you can make. How was the oil pressure before you pulled it apart? Is it bored over/undersize or standard? Any funny knocking noises?

Make sure you put the bearing cap(s) on the same places they came off of and torque with a torque wrench, whether you replace the bearings or not.

It looks to me like some dirt just managed to get in, or the PO managed to get grime on the crankshaft/bearing cap when he did the RMS. If the others all look fine I'd probably just run it, if they look the same I'd likely replace.

Oil pressure 15psi @idle and 35psi @1600rpm but the needle sometime move up and down while idling.
Looking at the underside of the insert shows .001....i'm guessing standard.
No funny knocking noise as far as i know but then again i have only clocked in 500 miles at most (just bought it 2 months back).

I'll report back after i look at the rest.

Thx.

 

[kastein]

I'd probably just run it... make sure you keep which bearing cap and bearing shell came from which main straight.

 

[BotakBeng]

I'd probably just run it... make sure you keep which bearing cap and bearing shell came from which main straight.

Will do that!
Thank you very much!

 

[Runnin'OnEmpty]

Those compression readings are low, but all are uniform.

What about doiing a re-ring and bearing job with the engine
in the vehicle? You're already halfway there, with the bottom
end opened up. Not much more work to pull the head and take
a look....

Can you shine a light up into a cylinder bore and see if any
crosshatch is left on the bore wall...?

If the bearing underside shows .001, that means it's an undersized
bearing that's been installed without any crank machining, (other
than possible polishing). I'd say it's been rebuilt once before.