Oil pressure takes forever after oil change
#58237
05/11/08 02:50 PM
05/11/08 02:50 PM
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Is it just me or this a common thing... everytime I do an oil change on the 400 it seems to take forever to get oil pressure. I had the truck run twice for about 30 seconds each time (after changing the oil) and I still have no pressure... I'd hate to run too long without knowing for sure...
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Re: Oil pressure takes forever after oil change
#58238
05/11/08 02:52 PM
05/11/08 02:52 PM
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Joined: Nov 2007
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Pacnorthcuda
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30 seconds!!!????? Yikes. First off are you priming your filter? Putting in as much oil as you can, waiting for it pass through the filter and keep adding till any more would be spillage as you put it on?
If its really taking that long I would be thinking your pump is cavitating on air.
Last edited by Pacnorthcuda; 05/11/08 02:53 PM.
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Re: Oil pressure takes forever after oil change
[Re: Pacnorthcuda]
#58239
05/11/08 04:53 PM
05/11/08 04:53 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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Did you actually time this? What is the pressure when it's warm and idling?
I second prefilling the filter. I do that on everything.
What grade of oil are you using?
Truck 400's also have a pretty long suction tube.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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Re: Oil pressure takes forever after oil change
[Re: Magnum]
#58240
05/11/08 06:04 PM
05/11/08 06:04 PM
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Yea I always fill my filters up as much as they'd take without spilling over (damn horizontal placement). I may prime it just to be on the safe side but sheesh a person shouldn't have to be doing this everytime they change the oil.
I was using 20W50 but am now using Rotella 15W40.
Pressure at warm idle is usually around 25. Startup is around 60-75 and driving is 40-50.
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Re: Oil pressure takes forever after oil change
[Re: earlybee]
#58243
05/11/08 07:57 PM
05/11/08 07:57 PM
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Well the prime did it... but at first it didn't want to with the oil filter on... once I took the filter off it came shooting out a couple seconds later... geez maybe i'm not filling the filter enough before i put it on... dunno... weird... anyhoo all is well now
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Re: Oil pressure takes forever after oil change
#58245
05/11/08 09:33 PM
05/11/08 09:33 PM
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Joined: Nov 2003
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torkrules
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Quote:
Is it just me or this a common thing... everytime I do an oil change on the 400 it seems to take forever to get oil pressure. I had the truck run twice for about 30 seconds each time (after changing the oil) and I still have no pressure... I'd hate to run too long without knowing for sure...
Sounds like it's loosing prime. My 496 did this once and while after an oil change and prolonged drain. So far the Hemi hasn't done this.
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Re: Oil pressure takes forever after oil change
[Re: MoparforLife]
#58247
05/11/08 10:09 PM
05/11/08 10:09 PM
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All my gauges are Autometer and the oil is electric. The pump itself is a new MP unit with barely 800 miles on it. Maybe it is losing its prime... is it possible that the setup on the B/RBs can be prone to "air lock"? I wouldn't think but just curious...
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Re: Oil pressure takes forever after oil change
[Re: DaytonaTurbo]
#58251
05/12/08 06:21 AM
05/12/08 06:21 AM
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Quote:
Any particular reason why you are running 20-50 or 15-40? Seems unnecessarily thick to me(for average Canadian temps). I've got an unopened, unknown mileage 440 and I run 10-30 in it. Oil pressure is the exact same as with the 15-40 which I have tried but no longer bother with. I don't fill the filter either, nor do I prime it, and after an oil change it only takes maybe 2 seconds or so before the needle in my cheapie mechanical oil pressure gauge shoots up to 76psi - the normal cold oil pressure reading for it.
I would try a different gauge, throw on a cheapie mechanical gauge before next time, just incase it's somehow a gauge/sender issue. Either that or try a thinner oil.
Well I read from various service books that the original specs on these engines called for a 20w50 so when I first got into these I just went with what was stated... However I have been wondering of late why such a thick oil is needed hence the drop to Rotella 15w40.
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Re: Oil pressure takes forever after oil change
#58252
05/12/08 07:32 AM
05/12/08 07:32 AM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Quote:
Well I read from various service books that the original specs on these engines called for a 20w50 so when I first got into these I just went with what was stated... However I have been wondering of late why such a thick oil is needed hence the drop to Rotella 15w40.
NEVER seen a manual that OEM stated to use 20/50 oil. Most of the time they specified 10/30. Yes big blocks do air lock at times. Have had it happen but it is not all that common.
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Re: Oil pressure takes forever after oil change
[Re: MoparforLife]
#58253
05/12/08 09:08 AM
05/12/08 09:08 AM
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Haynes Manual I have here that covers the last couple years of big block Dodge trucks shows 20w50?
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Re: Oil pressure takes forever after oil change
#58254
05/12/08 09:11 AM
05/12/08 09:11 AM
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NITROUSN
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Quote:
Haynes Manual I have here that covers the last couple years of big block Dodge trucks shows 20w50?
Thats bull crap. A Haynes manual is junk and full of mis information.
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Re: Oil pressure takes forever after oil change
[Re: NITROUSN]
#58256
05/12/08 09:22 AM
05/12/08 09:22 AM
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Quote:
Quote:
Haynes Manual I have here that covers the last couple years of big block Dodge trucks shows 20w50?
Thats bull crap. A Haynes manual is junk and full of mis information.
you ever notice how the haynes manuals are made of real cheap paper? thats so you can wipe with them.
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