No Oil Pressure! What happenend? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RShaips · 03-03-2007, 06:36 PM

My truck has sat for several months while I am restoring it. Well today I fired it up and I have no oil pressure. The motor was not taken apart and ran fine with good oil pressure before. The only thing I did was put an HEI Distributor on it and I also replaced all of the valve guide seals. Oil is pumping through my line but with very little pressure. The only thing I can think of is I have my lifters too tight and the valves are not sealing. Think this is the problem? Its the only thing I can think of. It runs and sounds fine. I am through working on it today, I am taking the kids downtown to the Supercross tonight. I did check the line to be sure it wasn't clogged. If its the oil pump I guess I can drop the crossmember out to get the oil pan off. Its a 72 4 x 4Thanks for the help

jay6891 · 03-03-2007, 07:55 PM

did you get the new dist. ingaged with the oil pump shaft? May just have it jammed into each other with dist clamp.

long71 · 03-03-2007, 08:58 PM

if the only thing you did was change the distributor then it has to be the shaft from the bottom of the distributor didnt engage in the oil pump or even worse fell out totally and is in your oil pan. very easy fix...

good luck

Jtrux · 03-03-2007, 09:25 PM

X2, it's the oil pump shaft.

Mudder · 03-04-2007, 12:43 AM

The bottom of the dist. shaft is slotted like a screw driver. It has to match up with the oil pump. Don't run it.

RShaips · 03-04-2007, 01:01 AM

I thought I had the distributer in the slot. The distributer felt like it dropped right in to it. Guess thats what I'll have to check tomorrow. Thanks

RShaips · 03-04-2007, 01:02 PM

The distributer is in the slot and I still have no pressure. I even backed off all my rocker arms nuts on one side to see if it made any difference, it did not. The only thing thats left is the oil pump. Maybe a piece of one of the valve guide seal got down in it and messed it up. Any ideas? I really needed to pull the oil pan and repaint or replace it anyway just didn't want to do it NOW!

70c10swb · 03-04-2007, 01:13 PM

Sound like there is some crud stuck to the pickup screen

3/4tonterror · 03-04-2007, 01:50 PM

try a different guage,check fitting on the block for sludge, or the pump pickup may be full of sludge.Did you have the motor on the floor, you may have flattened the bottom of the pan, which would put the pickup to close to the bottom of the pan = low pressure.all else fails remove dist/ and manually prime the oil and read the guage, still low then your clogged somewhere DID YOU CHECK THE OIL. FULL??????

*Billla* · 03-04-2007, 01:57 PM

Quote:

Originally Posted by 3/4tonterror

manually prime the oil

This is what I would do before looking anywhere else.

corn · 03-04-2007, 02:13 PM

Quote:

Originally Posted by Billla

This is what I would do before looking anywhere else.

badchev69 · 03-04-2007, 02:19 PM

this may be a shot in the dark but it happend to me in my blazer. The bypass valve that you spin the oil filter on to has a little fiberglass washer and spring that opens and closes at high rpm to bypass the too high oil pressure back to the pan. To make a long story short mine was messed up and lost all oil pressure and granaded my motor for a 25$ part. May be worth checking.

RShaips · 03-04-2007, 08:42 PM

Thanks for the suggestions. So far I dropped the pan, what a PITA! and took out the oil pump, looks and seems to work OK. So I guess I will get a new pump and put it back together. I really needed to clean up and paint my pan anyway, but it wasn't as easy as it looked to remove, had to unbolt the crossmember, and motor mounts, jack up the motor, scratch my paint where the HEI hit and valve cover hit, DUH! Then beat the crossmember forward. Anyway the pan is painted and I will buy new parts tomorrow and put it all back together, hopefully. If I still have no pressure then I'll keep looking..

67ChevyRedneck · 03-04-2007, 08:46 PM

Have you tried a new pressure gage? Is the line kinked or broken?

I had a temp gage that said my motor was running pegged out temp. wise after about 5 minutes. Gage was bad.

03-03-2007, 06:36 PM	#1
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	No Oil Pressure! What happenend? My truck has sat for several months while I am restoring it. Well today I fired it up and I have no oil pressure. The motor was not taken apart and ran fine with good oil pressure before. The only thing I did was put an HEI Distributor on it and I also replaced all of the valve guide seals. Oil is pumping through my line but with very little pressure. The only thing I can think of is I have my lifters too tight and the valves are not sealing. Think this is the problem? Its the only thing I can think of. It runs and sounds fine. I am through working on it today, I am taking the kids downtown to the Supercross tonight. I did check the line to be sure it wasn't clogged. If its the oil pump I guess I can drop the crossmember out to get the oil pan off. Its a 72 4 x 4Thanks for the help

03-03-2007, 07:55 PM	#2
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Re: No Oil Pressure! What happenend? did you get the new dist. ingaged with the oil pump shaft? May just have it jammed into each other with dist clamp. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

03-03-2007, 08:58 PM	#3
long71 clean concepts Join Date: Feb 2006 Location: fairfield california Posts: 56	Re: No Oil Pressure! What happenend? if the only thing you did was change the distributor then it has to be the shaft from the bottom of the distributor didnt engage in the oil pump or even worse fell out totally and is in your oil pan. very easy fix... good luck

03-03-2007, 09:25 PM	#4
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: No Oil Pressure! What happenend? X2, it's the oil pump shaft. __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

03-04-2007, 12:43 AM	#5
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Re: No Oil Pressure! What happenend? The bottom of the dist. shaft is slotted like a screw driver. It has to match up with the oil pump. Don't run it.

03-04-2007, 01:01 AM	#6
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Re: No Oil Pressure! What happenend? I thought I had the distributer in the slot. The distributer felt like it dropped right in to it. Guess thats what I'll have to check tomorrow. Thanks

03-04-2007, 01:02 PM	#7
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Re: No Oil Pressure! What happenend? The distributer is in the slot and I still have no pressure. I even backed off all my rocker arms nuts on one side to see if it made any difference, it did not. The only thing thats left is the oil pump. Maybe a piece of one of the valve guide seal got down in it and messed it up. Any ideas? I really needed to pull the oil pan and repaint or replace it anyway just didn't want to do it NOW!

03-04-2007, 01:13 PM	#8
70c10swb no brain no headache Join Date: Jan 2005 Location: Cape Cod MA Posts: 567	Re: No Oil Pressure! What happenend? Sound like there is some crud stuck to the pickup screen __________________ 1996 GMC Sierra z71 1970 SWB 2wd (project)

03-04-2007, 01:50 PM	#9
3/4tonterror Registered User Join Date: Dec 2006 Location: jaffrey,NH Posts: 325	Re: No Oil Pressure! What happenend? try a different guage,check fitting on the block for sludge, or the pump pickup may be full of sludge.Did you have the motor on the floor, you may have flattened the bottom of the pan, which would put the pickup to close to the bottom of the pan = low pressure.all else fails remove dist/ and manually prime the oil and read the guage, still low then your clogged somewhere DID YOU CHECK THE OIL. FULL??????

03-04-2007, 02:19 PM	#12
badchev69 Active Member Join Date: Apr 2004 Location: Stayton, Oregon 97383 Posts: 178	Re: No Oil Pressure! What happenend? this may be a shot in the dark but it happend to me in my blazer. The bypass valve that you spin the oil filter on to has a little fiberglass washer and spring that opens and closes at high rpm to bypass the too high oil pressure back to the pan. To make a long story short mine was messed up and lost all oil pressure and granaded my motor for a 25$ part. May be worth checking. __________________ 1969 C10 SWB /350 vortech/th400 1968 SWB build (in progress) 1969 SWB build (my son's future project) 1968 camaro yellow/white stripes (wife's car) 2011 GMC reg cab short bed 2wd daily driver 5/7 drop on 22's 1972 K5 Blazer 13"/11"lift,38"M/T MTZ's, 3" cust exst. 350/350 (sold it )

03-04-2007, 08:42 PM	#13
RShaips Senior Member Join Date: Jun 2002 Location: Augusta Missouri Posts: 804	Re: No Oil Pressure! What happenend? Thanks for the suggestions. So far I dropped the pan, what a PITA! and took out the oil pump, looks and seems to work OK. So I guess I will get a new pump and put it back together. I really needed to clean up and paint my pan anyway, but it wasn't as easy as it looked to remove, had to unbolt the crossmember, and motor mounts, jack up the motor, scratch my paint where the HEI hit and valve cover hit, DUH! Then beat the crossmember forward. Anyway the pan is painted and I will buy new parts tomorrow and put it all back together, hopefully. If I still have no pressure then I'll keep looking..

03-04-2007, 08:46 PM	#14
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: No Oil Pressure! What happenend? Have you tried a new pressure gage? Is the line kinked or broken? I had a temp gage that said my motor was running pegged out temp. wise after about 5 minutes. Gage was bad. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 03-04-2007 at 08:47 PM.



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