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76-cj7
04-09-2007, 06:01 PM
I was just wondering about my oil pressure. When cold at idle its bout 30 lbs but when full temp its down to 10psi at 600 rpms. Its a completly refurbished motor. Not a single part was left untouched in this 304. 8 quart Milodon oil pan too. I bought a pump housing and adapter plate all nickel coated from Bulltear. Im running 10W40 Valvoline with a mobil 1 filter. It just seems kinda low to me? Also what do y'all think of me running 15w40 Rotella T in this motor during the summer months? Planning on doing a remote filter setup and a oil cooler later on but what you guys opinions?

rollen dean montoya
04-09-2007, 06:39 PM
as for the oil pressure are going by the gage in the jeep or are you using a remote gage. sometimes if the oil pressure gage is electric you might get a low reading. i use rotella-t in my 78
chevy suburban(hardin marine 454) and my 88 lincoln MKVIILSC
(302). i use it year round. use a mechanical oil pressure
gage to verify correct oil pressure. let us know what you get
at cold idle and at operating temp.

76-cj7
04-10-2007, 12:35 AM
When cold i have around 20-30 lbs pressure and at opp temp its 10 psi and i do have a mech. gauge.

jeepsr4ever
04-10-2007, 07:27 AM
What type of oil filter are you using?

76-cj7
04-10-2007, 08:51 AM
Im using a Mobil 1 filter.

Goose
04-10-2007, 09:27 AM
sadly enough that is about what all my stock AMC motors run when the oil is up to temp.. (I actually run about 12-15 psi)
going down the road at about 2500 rpm it is 40 psi.. this is on 3 different AMC's 304 and two 360's. but it doesnt seem to hurt them any.. I rebuilt two of them at about 120,000 miles, and there was no more wear than normal.

So it is nerve racking till you get used to it. but it does seem normal for these.

76-cj7
04-10-2007, 12:58 PM
Ok....i just wanted to be sure on this......this is the first AMC i have built and i dont want it to be the last either. I kinda just thunk of that old rule of thumb......10 psi for every 1,000 RPMS.

jeepsr4ever
04-10-2007, 02:46 PM
I think you should have more PSI than that. Try tkaing the plunger and spring out and cleaning them and then re-install them and try again. On a rebuild you should generally have about 35-45psi hot but alot of that depends on the crankshaft grinder!

rollen dean montoya
04-10-2007, 03:13 PM
i thought that might be way low oil pressure. i thought most engines should run 30+ psi hot at freeway speeds.i like to use
hi flow oil pumps to make sure oil get everywhere in the engine.

Mudrat
04-10-2007, 05:56 PM
I think you should have more PSI than that. Try tkaing the plunger and spring out and cleaning them and then re-install them and try again.
Just as a safety note THE PLUNGER IS UNDER PRESSURE!!!! It took me 20 minutes to find my plunger after doing this - it bounced around the shop 2-3 times and wound up under the workbench behind some ammo cans!!!!! :oops: 111!!! #-o

rollen dean montoya
04-10-2007, 06:36 PM
you think the plunger was trying to tell ya something like
"dude you need to go shooting" 8)

Mudrat
04-10-2007, 06:43 PM
Actually, "DUDE ... don't un-screw with me!!!"

76-cj7
04-10-2007, 09:54 PM
Its a brand new cover, pump, adapter, plunger and all that from bulltear so i thinkin a dirty spring isnt the prob. Plus the block and heads were all cleaned and hot tanked and its only got 800 miles since rebuild. But i did have the crank ground by Brewster? machine up near Akron ohio. The local Napa machine shops first choice for crankshafts and rods. It came back .020 mains and .020 rods and everything plastigaged right in specs.

jeepsr4ever
04-11-2007, 07:04 AM
:-| Before we go any further try a Wix/Napa gold filter and if that doesnt cure it send the pump back to us here and we will give it a second inspection. Rarely does a break in ruin a set of gears but I have seen a dirty install cause massive gear wear.

Goose
04-11-2007, 09:04 AM
you mean 35-40 psi running down the road right? not at idle..
If I could get a solid 25 psi at idle I would be darn near orgasmic.

76-cj7
04-11-2007, 03:34 PM
Driving down the road it is great but at idle it leaves some to be desired at around 10 psi hot idle and bout 2k rpms its round 40 psi. Its just that think jeep will see alot of idle time out in the woods and i dont want to screw something up letting it idle with low oil pressure.

rollen dean montoya
04-11-2007, 06:34 PM
T.M.I. goose #-o

Goose
04-12-2007, 11:15 AM
Come on Rollen it's all good.. most guys my age are still trying to figure where they are leaking from!.

rollen dean montoya
04-12-2007, 03:13 PM
DOH #-o

Mudrat
04-12-2007, 04:35 PM
OOOoooohhhhhh I'm stay'n outta this one



http://www.floridajeepers.net/images/smiles/popcorn.gif

Goose
04-12-2007, 10:47 PM
HEH!.. If that grosses you out try a metamucil and cranberry juice cocktail.

Mudrat
04-13-2007, 04:44 PM
Pass - - - JD and rocks, well.... ROCKS!!!! http://smiley.onegreatguy.net/drink.gif

It's Friday and I get to sleep in tomorrow. 6AM alarm and at work at 7 or so :t:

tarior
08-29-2007, 01:43 PM
I like to see about 25 psi idling and about 55 psi @ 2500+ rpm. I'm getting about 60 psi out of my 15 year old 401 now that I've installed a mid plate, new spring/plunger and changed oil filters.

BREK
08-29-2007, 04:04 PM
My freahly rebuilt 390 gets 20 @ idle & 60-65 @ 2500 plus when hot, and I have a nickel cover with an old spring new plunger.

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