I have a 1980 toyota 4x4 with a 20r. It runs great, no noises at all, but once warm, it idles somewhere around 8-10 psi. I'd rather see that number higher than that. Is this something a set of rod bearings could solve? New oil pump? Im not very familiar with the 20r yet, but i'd like to learn as much as possible.

If anyone has any experience with this, or remedies, i'd appreciate it.

 

check on the back side of the engine, between the block and the head, at the oil bypass thing? dont really know what it is called. but i know on the 22r they clog and cause the oil pressure to drop. eventually will cause top end ploblems if that is the problem.

 

Thanks, I'll check that out tomorrow. I want to try and get this solved while everything is still running nice, and not put it off until the bottom end starts talking to me.

 

yah the thing is like four or five inches long and some kind of pot metal stuff. i found out about it after buying a jasper engine and starting to rebuild the old one.

 

This thing? Its held on with 4 bolts to the back of the head. Do I just unbolt it and clean it out, and re-install? Thanks

 

thats the one. thats all that i know of. just pull that off and clean it out and try and clean as much up in the head and block as you can with a pick or cloths hanger. that seemed to be the only problem with mine. hope that fixes the problem. good luck.

 

I need some micro hands to work in there, hopefully I can use a mirror or somthing to see what i'm doing, lol. I'll let you know how it goes.

 

Why ???




Fred

 

you should be able to use rachet wrenches. but i guess it was a lot easier when the block was on a stand. but keep me posted.

 

Is that normal? I just got the impression from a few people that 8psi was on the low side. If it is normal, i'd love to hear that because it runs really well now. I just wanted to get on it before I let something happen from low oil pressure.

 

Yes, it's perfectly normal, in spec.
Whomever told you otherwise is kinda clueless, huh ?

Anyway, if you really wanted to raise the pressure, your own description tells you how.
You said when it warms up the pressure drops.
The oil is too thick when it's "cold" and thus the high pressure.
To raise the pressure, change and run gear lube

Anyway, it's not pressure that lubes, it's flow.



Fred

 

Now your making me want to tear it down to make sure all the bearings are getting that flow, lol.

 

One of those liquid pressure rules.

When velocity increases, pressure decreases.
Pressure goes up, velocity goes down.
And since this is oil we are talking about, like mentioned before, once oil is warmer, its thinner!

If you wanted to install some kind of flow meter for the oil system in the bottom and top end, that could be the best thing to keep track of what your oil is doing and where it is going.

 

Actually it helps, especially a lot here , to think of it the other way.
That is as oil cools, it thickens.

BTW, to the original poster, what weight oil are you using ?



Fred

 

10w40