Re: Hemi oil pressure at idle?
[Re: rickraw]
#2970048
10/03/21 05:23 PM
10/03/21 05:23 PM
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Joined: Jun 2003
Posts: 21,516 It's a dry heat
gtx6970
Too Many Posts
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Too Many Posts
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Posts: 21,516
It's a dry heat
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That dent may have cracked the pickup tube where It’s threaded in the block. If we’re me, I’d drop the pan first. I think u need more oil capacity for a high volume pump. Stock pumps always worked for me in a street car. Agreed. This would MY next step. And IMO go with a straight 30 or 40 wt oil Is it dangerously low? No. But i wouldn't beat on it hard with it that low either until you know more about the shortblock
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Re: Hemi oil pressure at idle?
[Re: Dragula]
#2970101
10/03/21 09:13 PM
10/03/21 09:13 PM
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Joined: Jan 2004
Posts: 4,586 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,586
Motor City
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Shim the pump...This is always an issue on Hemi engines. Yes, I agree. Hemi's hold so much oil up top in each rocker cover. Still should be your low oil pressure though.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Hemi oil pressure at idle?
[Re: Dragula]
#2970196
10/04/21 08:13 AM
10/04/21 08:13 AM
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Joined: Jun 2014
Posts: 1,344 VA
dragon slayer
pro stock
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pro stock
Joined: Jun 2014
Posts: 1,344
VA
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Shim the pump...This is always an issue on Hemi engines. Do you mean relief spring? Anyone with experience were the issue was a cracked pickup, did it aerate the oil as an indicator, or undetectable from a look at the dipstick?
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Re: Hemi oil pressure at idle?
[Re: Cab_Burge]
#2970352
10/04/21 01:09 PM
10/04/21 01:09 PM
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Joined: Feb 2014
Posts: 1,715 central il.
second 70
top fuel
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top fuel
Joined: Feb 2014
Posts: 1,715
central il.
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[quote=Cab_Burge] If it has the black spring try switching it into current your pump and see if that helps or not Cab I have 2 HV melling pumps and both have the plain spring which I thought was the high pressure spring? Good topic for me because I believe my pressure is too high with the HV pump and plain spring. 55 idle hot with 10-30 mobile one. 75 @ 2,000 and gets as high as 95 at higher rpm's. I also have regular melling with pink-red spring and I believe it's too low never gets over 45 hot. So I'm guessing putting the pink spring in the HV pump would lower it to 45 max too??? I thought the black spring was between the 2 but I can't find one to try. So I'm wondering do I just shim the red spring and if so how much to reach 65psi or cut plain spring to lower pressure and if so how much do I trim? Problem this is on a hemi and pump must be removed to get to spring and the adjustable product won't fit due to motor mount. I had a cracked tube and it would lose prime when oil level got below crack, No air bubbles.
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Re: Hemi oil pressure at idle?
[Re: Buster]
#2970384
10/04/21 01:44 PM
10/04/21 01:44 PM
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Joined: Oct 2005
Posts: 275 Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 275
Anchorage, Alaska
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... I have a new high volume Melling oil pump but I couldn't get it on because it wouldn't clear the motor mount. I couldn't get the motor mount out because it wouldn't clear the steering box. At that point I put a new o-ring on the pump drive shaft, put it back together and crossed my fingers. No change.. I guess I'll try to get the high volume pump on again, I'm going to loosen both motor motor mounts and lift the front of the engine with a cherry picker... Nice car by the way! If you got a standard volume pump in and out, I would think you could get a high volume in there if you took the pump cover off. Put the pump housing and gears in place first, then bolt the cover back onto the pump. Just make sure the o-rings don't fallout of place
440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth
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Re: Hemi oil pressure at idle?
[Re: metallicareload]
#2970404
10/04/21 02:34 PM
10/04/21 02:34 PM
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Joined: Jan 2004
Posts: 8,360 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,360
fredericksburg,va
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Hemis came with the big pump so if it ain’t on there someone changed it out. Dent in wrong pan, first place to look for pickup damage. Every Hemi we had carried 40 psi at idle with those ‘big’ bearings. Also Try another filter. Who knows what’s been done to the engine in those first few years though. I’d have that pan off tonite. Nice car though, I have a 66 Belvedere Hemi 4 speed trying to get together. Wish you luck and hope it’s an easy fix.
Last edited by cudaman1969; 10/04/21 02:37 PM.
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Re: Hemi oil pressure at idle?
[Re: cudaman1969]
#2970411
10/04/21 02:44 PM
10/04/21 02:44 PM
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Joined: Nov 2007
Posts: 21,847 Kirkland, Washington
Pacnorthcuda
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Posts: 21,847
Kirkland, Washington
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Hemis came with the big pump so if it ain’t on there someone changed it out. Dent in wrong pan, first place to look for pickup damage. Every Hemi we had carried 40 psi at idle with those ‘big’ bearings. Also Try another filter. Who knows what’s been done to the engine in those first few years though. I’d have that pan off tonite. Nice car though, I have a 66 Belvedere Hemi 4 speed trying to get together. Wish you luck and hope it’s an easy fix. Huh? Hemis had their own pans and pickups but the pump itself was the same as other RB motors. I don’t think Mopar put a HV pump on any production vehicle?
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Re: Hemi oil pressure at idle?
[Re: dragon slayer]
#2970530
10/04/21 07:13 PM
10/04/21 07:13 PM
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Joined: Jan 2003
Posts: 12,310 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,310
Benton, IL.
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The car is almost 55 years old, and the OP said he thought it had been raced and rebuilt. What's the chances that the OE pump is still on there? But no matter what, I would start with a new high volume pump. Why guess with what is on it and what condition it's in? After changing the pump, the OP can decide if anything needs to be done about too much pressure.
IMHO, messing with the relief spring now is a waste of time because it is basically the same job to mess with the spring as it is to install a new pump and it is unlikely that the spring is the cause of low oil pressure. After finding that there is no o-ring on the shaft, I wouldn't put any more effort into that pump assembly. Just move on.
Master, again and still
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Re: Hemi oil pressure at idle?
[Re: Pacnorthcuda]
#2970534
10/04/21 07:33 PM
10/04/21 07:33 PM
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Joined: Jan 2004
Posts: 8,360 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,360
fredericksburg,va
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Hemis came with the big pump so if it ain’t on there someone changed it out. Dent in wrong pan, first place to look for pickup damage. Every Hemi we had carried 40 psi at idle with those ‘big’ bearings. Also Try another filter. Who knows what’s been done to the engine in those first few years though. I’d have that pan off tonite. Nice car though, I have a 66 Belvedere Hemi 4 speed trying to get together. Wish you luck and hope it’s an easy fix. Huh? Hemis had their own pans and pickups but the pump itself was the same as other RB motors. I don’t think Mopar put a HV pump on any production vehicle? . ALL of them came with the big pump (it needs the volume because of oil trapped up top). Any and all aftermarket pumps where copy’s of the factory pump. Way back in the day it was called a HEMI pump not high volume (they also came stock with the high pressure spring), you have to be at least 70 to know this stuff, lol, you’re welcome Also in the early 70s Chrysler sold a ‘kit’ using the ‘HEMI’ rotors and drive with an aluminum spacer to install on a reg pump to make a high volume pump (still got mine if you want a pic)
Last edited by cudaman1969; 10/04/21 07:38 PM.
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Re: Hemi oil pressure at idle?
[Re: dragon slayer]
#2970539
10/04/21 07:52 PM
10/04/21 07:52 PM
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Joined: Nov 2007
Posts: 21,847 Kirkland, Washington
Pacnorthcuda
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Too Many Posts
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Posts: 21,847
Kirkland, Washington
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The did have the stronger relief valve spring. But agree not a high volume. Yep. All RB’s got the standard pump (relief spring may have varied) from the factory.
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Re: Hemi oil pressure at idle?
[Re: cudaman1969]
#2970727
10/05/21 05:05 AM
10/05/21 05:05 AM
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Joined: Aug 2019
Posts: 9,578 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 9,578
Super Spudsville
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Time is hard on all of us. Well I might have to eat crow, went back into all my old DC books to double check and the original book said same pump other than black spring. I’ll check my buddies 67 GTX this week to see what it has (original as built). I just remember taking the big pump (all orange) off a blown up 68 Hemi that I picked up to install on my max wedge (in 1974). Won’t be the first time Ive been wrong.
STOP POTATO HATE!
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Re: Hemi oil pressure at idle?
[Re: 68 HEMI GTS]
#2970740
10/05/21 07:16 AM
10/05/21 07:16 AM
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Joined: Jan 2003
Posts: 4,101 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,101
Shelby Twp. Mi
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Not the kind of engine to ignore low oil pressure on. I’d start with the oil pump as the others suggested and work from there. x300!!!
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Re: Hemi oil pressure at idle?
[Re: Mr PotatoHead]
#2970900
10/05/21 12:44 PM
10/05/21 12:44 PM
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Joined: Jan 2004
Posts: 8,360 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,360
fredericksburg,va
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Time is hard on all of us. Well I might have to eat crow, went back into all my old DC books to double check and the original book said same pump other than black spring. I’ll check my buddies 67 GTX this week to see what it has (original as built). I just remember taking the big pump (all orange) off a blown up 68 Hemi that I picked up to install on my max wedge (in 1974). Won’t be the first time Ive been wrong. Yep brain fade too. Service manual said 25 psi at 500 rpm also so engine is probably ok.
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