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10-02-2007, 09:42 PM
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#1 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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bad oil pressure
hi,
i just got my truck back on the road and it running great... Except, the oil pressure is almost zero!  and under throttle it goes down even more! it should go up under throttle. the oil level is fine. and the oil pressure was fine the first few days i drove it, than it just crapped out. any ideas?
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 09:52 PM
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#2 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: bad oil pressure
get an after market gage and check you might find the gage to be bad
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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10-02-2007, 09:56 PM
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#3 |
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Old Skool Club
 
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: bad oil pressure
...and, you only need to have 10psi per 1000rpm's.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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10-02-2007, 09:56 PM
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#4 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
i have two aftermarket gauges and the both read the same thing. the stock one even barely reads it.
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 09:57 PM
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#5 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
and i only have about five at the most and thats at idle. when you give it gas, even up in the higher rpm range, it goes to almost zero
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 10:01 PM
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#6 |
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Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: bad oil pressure
hows the engine built and what wieght oil are you using???
buddy of mine has a 73 mustang with the 351C and had basically no oil pressure and asked him what oil he used and he said 5w30 so i had him take it out and put in 20w50 and would ya know it he had perfect oil pressure, ofcoure hes not a car guy as much as he thinks/trys to be
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-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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10-02-2007, 10:02 PM
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#7 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
yeah i always run a 20w50.
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 10:04 PM
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#8 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
the engine is a sbc with a mild cam, lots of goodies, maybe 20,000 miles on it. im thinkin maybe my oil pump....
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 10:07 PM
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#9 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: bad oil pressure
Rut-o! Need more info-did you build it?-did you install all oil gallery plugs?- Did you check bearing clearness?-
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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10-02-2007, 10:07 PM
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#10 |
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Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: bad oil pressure
Oil pump pick up tube may have fallen off.
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10-02-2007, 10:08 PM
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#11 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: bad oil pressure
Just saw your last post. Did it do this all of a sudden?
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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10-02-2007, 10:12 PM
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#12 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
the tube may have fallen off! not a bad idea. the plugs were all put in when i built it. all the clearences were fine. it ran real well for like 20000 miles than i decided to pull the motor to do suspension/ frame/ cab work on it. than when i put it back in the oil pressure was fine untill a few days after driving it. it runs good still it doesnt click or act like its not getting oil. however i dont really want to test my luck .
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-02-2007, 10:56 PM
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#13 |
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Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: bad oil pressure
What if ... the tabs on the pump drive shaft sheared off. Low rpms could have enough friction to barely turn the pump but more rpms would slip causing lower pressure.
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10-02-2007, 11:53 PM
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#14 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,886
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Re: bad oil pressure
Personally I would have shut it down the instant I noticed no pressure and dropped the pan to look.I had a buddy once ("nah,it won't hurt it") who wreaked a 350 by running it with the gauge near 0.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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10-03-2007, 12:08 AM
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#15 |
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Registered User
Join Date: Feb 2005
Location: Carl Junction, Missouri
Posts: 2,061
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Re: bad oil pressure
i burned so many bearings on my first motor. it was a used motor to begin with, and i figured 10-12 psi was normal because that's what it always ran. i replaced rod bearings twice until i needed to replace main bearings..
then i bought a new motor the new motor ran at 20 psi at idle up to 60 psi cruising. now i clearly see my old engine had a bad oil pump. Last edited by matthufham; 10-03-2007 at 12:08 AM. |
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10-03-2007, 09:33 AM
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#16 |
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Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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Re: bad oil pressure
Is your distributor fully seated? It could be stepping up??? Maybe?
Was the pump pickup fully seated?
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85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days!  05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal! 
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10-03-2007, 09:40 AM
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#17 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: bad oil pressure
when replacing oilpumps i always tack weld the pickup to the pump// drop the pann and check pickup and rod
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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10-03-2007, 05:35 PM
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#18 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
yeah i didnt tack the oil pick up to the pump, i should have. i havent pulled the pan yet but im planning on it. is it common of the sump to fall off? and while its off im just going to replace the oil pump and rod as well.
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'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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10-03-2007, 07:56 PM
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#19 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: bad oil pressure
i've seen quite a few pickups fall off the pumps over the years
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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10-04-2007, 12:44 AM
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#20 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,373
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Re: bad oil pressure
check the pickup for debris. i had a problem with one of my inline 250's where, when the engine would warm up, the oil pressure would drop drastically at idle. ends up that a wad of gunk caked inside the top of the valve cover dropped off and made its way down to the pan. instant pickup clog, instant drop in oil pressure.
of course, it can't hurt to check your pressure gauge/line for accuracy.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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10-04-2007, 01:05 AM
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#21 |
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Overdrive club
Join Date: Sep 2007
Location: apache junction, arizona
Posts: 819
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Re: bad oil pressure
Ive seen timing gears come apart and plug the pickup,but this probably isnt the case!!!Good luck with what ya find!!!!!!
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1971 c-10 1951 3100 chevy 1970 chevy c-30 Sold! |
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10-04-2007, 04:53 PM
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#22 |
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Registered User
Join Date: Aug 2007
Location: greenville,ms.
Posts: 47
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Re: bad oil pressure
check your oil filter. When you remove it cut it open with a filter cutter and make sure it isn't collapsed.
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10-04-2007, 07:00 PM
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#23 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: bad oil pressure
Also, check for crimped oil lines. If you had it off an disconnected and reinstalled it, something may have bent or crimped the tubing.
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10-04-2007, 07:13 PM
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#24 |
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Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: bad oil pressure
When you took the motor out to do that frame work or whatever - did you take anything off the motor? (Distributor?)
If it was running fine for 20k and this just started happening, I would guess something got into the pickup tube silicone gasket maker is good @ doing that if you really slathered it on the oil pan etc. my next guess would be the pickup fell off and the higher RPM "0" reading is because the hole the pump isn't low enough in the pan.
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-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered   
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10-04-2007, 11:47 PM
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#25 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: bad oil pressure
well i pulled the oil pan today and the pickup was still on, and the drive gear was hooked up. so the only possibilities left could be a clogged oil pressure line or a mechanically bad oil pump, or the collapsed oil filter idea
__________________
'69 C10 SWB 350 edelbrock int/carb .420 .442 cam 700r4 70 lwb c10 work truck 250 I6 with two inch lift springs and a two inch bodylift and 33/12.5s |
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