Bearing Clearance?

[djmixerx]

Yea i rebuild my motor and polish the and kinfe edge the crank. Now i got a low oil pressure when my cars warm. I think the bearing might be to loose. Is there a way to make the bearing alittle thicker to make the space between the crank and rods have a smaller gap between them? i did the that gauge tap or something like that i forgot the name. It measure space between things like this. Te clearance was like 151 i think i dont remember. if u need more explaination hit me up. i need help. im sick of seeing the low oil presure light come on. and i do have a manual gauge that reads oil presure.

 

[98TsiAWD]

No, you cant make a bearing "bigger". The only thing you can do to them is use scotchbrite or emry cloth on the backside of them, that would give you more clearance.

Stock spec I believe is .015-.020"

I set all mine to ~.025" when I did the rebuild, I have plenty of oil pressure.

Pull your oil pan and pull a rod bearing cap and check it out using plasticguage.

 

[djmixerx]

yea the clearance is .10 - .25 i forgot what mine was but it was the maxed limit of open clearence. and yea i used the plasticgauge i just forgot what it was called. i think it was to much. could that be causing my low oil pressure problem? or could i be a cracked silent shaft bearing?

 

[Defiant]

im sick of seeing the low oil presure light come on. and i do have a manual gauge that reads oil presure.

What pressure does your gauge read? You may just need a new idiot light sender.

 

[Talon007]

Never trust the factory guage. Put on a master guage, and see what the pressure is at hot idle.

 

[djmixerx]

yea i dont use the stock gauge. whats a idiot light? never heard of that. when warm it reads like 10 and under but if i gas it it moves up like 60 or 80psi . does it suppose to go up to 100?

 

[yo2001]

mine idles at 13 psi at best. 120psi or so under load thanks to no balance shafts

 

[Defiant]

whats a idiot light? never heard of that.

erm... the low oil pressure warning light. Also called a "too late" light.

 

[djmixerx]

not really i see that light come on all the time but the motor still moves. i know it bad for the motor but i dunno didnt siege yet.

 

[Defiant]

Replace the sender.

 

[djmixerx]

oil pressure sender? i have a AUTOMETER GAUGE like i said.

 

[Defiant]

The oil light sender. The one that keeps lighting up and frightening you.

 

[seeker]

Your decimal places are way off or you do have problems. Most of the motors I build are running about .001" to .0012" (mains) after align bore & hone. Plastigauge works fine and most people do use it, but I stopped a while ago. I only mic everything now, I used to do both. Platigauge leave a very small impression in the bearing surface that I don't like, it is fine I know, but I am a bit overkill on everything. I run the rod clearances around .0012" -.0015" typically.

 

[Defiant]

Platigauge leave a very small impression in the bearing surface that I don't like, it is fine I know, but I am a bit overkill on everything.

Yipes, that is a little overkill.

Still, it's all in the details.