250, no oil pressure - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aerotruk63** · 06-18-2015, 06:38 PM

Started the 250 after sitting for 4+ years and it ran great. Drove it down the street and it began to sputter and then backfired. Pulled it back to the garage and found the distributor was loose. Set the timing position as it always was pointing and the truck started right away. BUT, now there's no oil pressure.

Pulled the distributor and the tongue on the end of the shaft is still intact. Installed another oil pressure gauge, no pressure.
Started and idles great.

Did something to the oil pump?
Dropped the pickup tube?

hotrod66 · 06-18-2015, 09:13 PM

Have you tried using a priming tool to spin the pump ?

WOLFMANmike · 06-18-2015, 11:19 PM

Quote:

Originally Posted by aerotruk63

Started the 250 after sitting for 4+ years and it ran great. Drove it down the street and it began to sputter and then backfired. Pulled it back to the garage and found the distributor was loose. Set the timing position as it always was pointing and the truck started right away. BUT, now there's no oil pressure.

Pulled the distributor and the tongue on the end of the shaft is still intact. Installed another oil pressure gauge, no pressure.
Started and idles great.

Did something to the oil pump?
Dropped the pickup tube?

ohh i think its time to drop the oil pan .. that sounds like pump failure or at the least a pump pickup tube has fallen off the oil pump . at any rate i would not run the engine untill that is fixed as you will eat up your crank and rod bearings in short time ... also just try to put in a aftermarket oil gauge to see if its the gauge but i doubt it .. im thinking its pump related

**aerotruk63** · 06-19-2015, 05:45 AM

No, I did not try a priming tool as suggested. Time to make one.

Tried two other pressure gauges without success.

Lokin4AReason · 06-19-2015, 07:56 AM

priming the pump helps ..

also cheque the clearance of the pickup to the oil pan ... it might need to be adjusted

06-18-2015, 06:38 PM	#1
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	250, no oil pressure Started the 250 after sitting for 4+ years and it ran great. Drove it down the street and it began to sputter and then backfired. Pulled it back to the garage and found the distributor was loose. Set the timing position as it always was pointing and the truck started right away. BUT, now there's no oil pressure. Pulled the distributor and the tongue on the end of the shaft is still intact. Installed another oil pressure gauge, no pressure. Started and idles great. Did something to the oil pump? Dropped the pickup tube? __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

06-18-2015, 09:13 PM	#2
hotrod66 Registered User Join Date: Jun 2008 Location: space station delta farce (justin tx) Posts: 594	Re: 250, no oil pressure Have you tried using a priming tool to spin the pump ? __________________ Between saying and doing many a pair of shoes are worn out

06-19-2015, 05:45 AM	#4
aerotruk63 Check The Champ, Demonstrator Join Date: Jun 2009 Location: Montreal,Quebec Posts: 6,627	Re: 250, no oil pressure No, I did not try a priming tool as suggested. Time to make one. Tried two other pressure gauges without success. __________________ 1963 *Chevrolet Truck* Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original *Chevrolet Truck* Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1

06-19-2015, 07:56 AM	#5
Lokin4AReason Registered User Join Date: Oct 2014 Location: somewhere . . . Posts: 972	Re: 250, no oil pressure priming the pump helps .. also cheque the clearance of the pickup to the oil pan ... it might need to be adjusted __________________ dont want to hear excuses, i want to hear solution(s)



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