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08-23-2013, 11:58 AM
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#1
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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cranking oil pressure
Should I expect more than 20-25psi during cranking? This is my 4.8 LR4. I only get about 20 psi during crank and I'm not getting oil through the push rods yet. I crank for about 10 seconds at a time
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08-23-2013, 01:08 PM
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#2
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Ok, I feel a little better now. I went to lunch for a while and started cranking again. I got a little oil out of a few of the push rods, and after a few more cranking attempts I got it out of all the right hand side rockers. I'll pull the other valve cover and make sure they are ok too
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08-23-2013, 01:27 PM
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#3
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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I'm no expert but 20psi during cranking seems OK to me. It's not like the starter is going to have the power to spin the oil pump fast enough to build a lot of pressure. If you have the plugs out too then it's probably spinning more than fast enough.
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08-23-2013, 01:30 PM
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#4
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,361
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20 psi is fine for priming. As long as you are getting oil to the top end, you are good to go.
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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08-23-2013, 01:38 PM
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#5
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Oil out of all the push rods except the number 1 intake. Pulling the valley cover now
Ok, thanks for the word. I was going I didn't pinch the oil pickup o ring installing the pickup
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08-23-2013, 01:57 PM
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#6
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Ok the roller on the lifter looks wet with new clean oil, but nothing out off the pushrod still. Really really don't want to pull a head, should I just try starting it when I am to that point and see what happens?
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08-23-2013, 02:00 PM
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#7
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Forgot to say, I pulled the rocker and blew out the pushrod. Just did it again and the end in the lifter had a lot more oil on it this time. Nothing trapped in there though
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08-23-2013, 02:17 PM
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#8
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,361
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How much cranking have you done total?
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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08-23-2013, 02:18 PM
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#9
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by Blackbirdws6
How much cranking have you done total?
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Sounds like enough to shoot oil out the pushrod 
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08-23-2013, 02:21 PM
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#10
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Isn't this a junk motor...?
Just crank it, run it, and drive.
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08-23-2013, 02:22 PM
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#11
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,361
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Quote:
Originally Posted by WildBillyT
Sounds like enough to shoot oil out the pushrod |
Thanks Bill.  I was only asking because perhaps it wasn't enough to get oil up ALL of the pushrods.
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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08-23-2013, 02:22 PM
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#12
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Quote:
Originally Posted by Blackbirdws6
How much cranking have you done total?
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Quote:
Originally Posted by WildBillyT
Sounds like enough to shoot oil out the pushrod |
Yeah, quite a bit. It flows out of the rest of them nicely while I crank so I don't get it. The lifter is putting out oil, I pulled the rocker and cranked it for a second without the push rod and oil flowed over the top of the lifter.
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08-23-2013, 02:38 PM
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#13
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by Blackbirdws6
Thanks Bill. I was only asking because perhaps it wasn't enough to get oil up ALL of the pushrods. |
Obscure 'jackin it joke is obscure.
I know what you meant, and it could be the case.
Bear, have a look at this link:
http://www.chevelles.com/forums/showthread.php?t=353278
Maybe try swapping the pushrod?
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08-23-2013, 03:57 PM
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#14
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Ebearnezer Scrooge/Power Member/Lips
Join Date: May 2006
Location: Hamilton, Mercer county
Posts: 4,141
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Tried swapping the intake and exhaust, but the battery is almost dead  going to the movies in a bit, give the battery some time to recover. It's been in the trickle charger the whole time. In the mean time I'll keep putting the rest of the engine together, I should be able to wire everything tomorrow and try hooking up the HP tuners and firing this thing.
Last edited by PolarBear; 08-23-2013 at 03:58 PM.
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