AMC V-8, 100 psi oil pressure

guffey24

guffey24

Well-Known Member
Joined
Jun 7, 2006
Location
Hendersonville, NC
The oil pressure relief plunger will not move at all, it is stuck, resulting in very high oil pressure

give me some ideas on how to get this thing out :-|

I thought about taking a tap or a long easy out and trying to get it out, but that would be a stretch

any ideas
 
alright guys got it unstuck and cleaned it up real good

the releif valve and the cavity it sits in

put everything back together and it did not change anything

I am thinking that the red HD spring might be the problem

I am also going to change to a mechanical oil pressure gauge

which will get rid of another thing that it could be

the sending unit
 
Well I have the opposite issue, my guage reads 0 at idle :shaking: (however no sounds of lack of oil and normal temps) Brand new oil pump housing, brand new, new style oil pump without the relief valve. I am gonna do the same. Change the sending unit and then the mechanical guage. Be interested in what you find.

Steve
 
guffey24 said:
alright guys got it unstuck and cleaned it up real good
the releif valve and the cavity it sits in
put everything back together and it did not change anything
I am thinking that the red HD spring might be the problem
I am also going to change to a mechanical oil pressure gauge
which will get rid of another thing that it could be
the sending unit
Click to expand...

On theone hand that sounds great but in real life I don't think you can make that much pressure unless you have a blockage in the oil galley which would be tough to do with the AMC 401....but maybe not imposible. I would throw on the mechanical gauge. If you get the same readings I would go over to Bulltear.com and post up on their forum. Very knowledgable folks.
 
I still think it is the gauge/sending unit.

It you were making 100 psi the dipstick would have left a nice dent in the hood.
 
Rule #1 of troubleshooting.
Identify the problem before you attempt a solution.

Verify all readings through redundant test procedures using different data gathering instruments before assuming the problem is known.

Just an interesting quote that is stuck in my head
 
Caver Dave said:
Not really... but it'd be leaking from every seal in the thing! (ask me how I know :( )
Click to expand...

well it is leaking from the oil pump seal, the plunger bolt, and also saw some coming from the intake manifold

I think the plunger is stuck again

gonna take off the oil filter adapter and see what is going on, the guys over at bulltear think that I may have some garbage in the oil pressure relief galley that is causing the plunger to stick

and Caver lets here how you know
 
guffey24 said:
and Caver lets here how you know
Click to expand...

Uh, that would be the same trashed up relief circuit and some spring shimming! It runs about 70# cold and 20# warm at idle... but leaks from the lower seals nicely. Fortunately, motor oil is cheaper than the PITA from changing the seals and dinking with the oil pump... again :o
 
a good cleaning always does the body good, I mean the Jeep
took off the oil filter adapter from the oil pump and heat cleaned it, you should have seen the crap that came out it
anyway cleaned it up real good, reinstalled everything with a new gasket and it's good
I am reading 70 psi cold and 25-35 psi after it warms up
 
Thats closer to where you expect it to read. Were your readings off the sender or a mech gauge?
 
OK, Still a little on the high side, so probly blocked somewhere else. We're talking AMC not SBC.
 
Caver,
You may be right. I've heard 40-60 cold is good....you can't build as much pressure with the large oil galleys. He did describe a boat load of crap that came out when he opened it up. I am a little suspicious he may have more crud somoewhere but nothing says he can't run it like that an keep an eye on the pressure.
 
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