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#1 |
Registered User
Join Date: Aug 2011
Location: Saint Augustine, FL
Posts: 195
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oil pressure light on-question
68 c10, 250 six
I fired my truck up today after it sat for the past two days. The last time I drove it, it gave me no problems. Today, as soon as I turned it on, the oil pressure light came on. I turned it off and checked the oil, which was full. No leaks or puddles. I then drove through the neighborhood and noticed it was running a little rough, so I took it home. If I revved the motor, the light would dim in relation to the RPM. It has rained a lot in the last two days, and the truck has been outside if that makes any difference. My thought is to check the pressure with a mechanical gauge tomorrow, and replace the oil pressure sending unit, but I wanted to see if anyone had any ideas on other things to check. Thanks fellas. |
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#2 |
Registered User
Join Date: Dec 2011
Location: Attica,indiana
Posts: 264
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Re: oil pressure light on-question
Yes definitely do that and before you check it with a mechanical gauge crank it over to be sure no sludge has plugged the passage to the sending unit which will give a false reading.
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#3 |
Registered User
Join Date: Aug 2011
Location: Saint Augustine, FL
Posts: 195
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Re: oil pressure light on-question
So pull the sensor (I think I found it...right next to the starter on the block with a single wire?) then fire it up and see what comes out?
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#4 |
Registered User
Join Date: Dec 2011
Location: Attica,indiana
Posts: 264
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Re: oil pressure light on-question
Just make sure oil comes out then install your gauge to check it .
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#5 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,392
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Re: oil pressure light on-question
It's going to puke oil all over if you do that! Pulling the sender off should allow oil to drip out. Peek in there and clean it with a wire or something if there is sludge built up there. Then put a gauge on it.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#6 |
Registered User
Join Date: Dec 2011
Location: Attica,indiana
Posts: 264
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Re: oil pressure light on-question
I usually don't try to clean it with a wire or anything as you can further lodge debri in the passage
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#7 |
Registered User
Join Date: May 2012
Location: murfreesboro, TN
Posts: 743
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Re: oil pressure light on-question
i had the same problem with my 250 and the sending line was pluged up
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![]() . bagged and soon to be bodied 70 longbed http://67-72chevytrucks.com/vboard/s...d.php?t=564028 |
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#8 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: oil pressure light on-question
Better replace oil filter before starting again.
If new oil filter solves pressure problem then expect to see metal flakes from bearings inside removed oil filter. Good luck and I hope it was sending unit not plugged filter. |
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#9 |
Registered User
Join Date: Aug 2011
Location: Saint Augustine, FL
Posts: 195
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Re: oil pressure light on-question
Well, finally did the oil change after a weekend of nothing but rain and everything looked good, so I replaced the pressure switch. All is now well with that...thanks guys.
NOW I fired it up and let her come up to temp, and the water outlet cracked in half. D'oh! I have a 195* thermostat in there. I also noticed the vacuum advance hose wasn't connected ![]() |
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#10 |
Registered User
Join Date: May 2012
Location: murfreesboro, TN
Posts: 743
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Re: oil pressure light on-question
I run a 180 and no temp gauge lol
Truck runs super cool even with the clutch fan and the tiniest fan shroud ever Posted via Mobile Device
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#11 |
Registered User
Join Date: Aug 2011
Location: Saint Augustine, FL
Posts: 195
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Re: oil pressure light on-question
Haha yeah, no fan shroud here...i do have a 160 tstat at the house, but i think that's too cool
Posted via Mobile Device |
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#12 |
Registered User
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
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Re: oil pressure light on-question
I run 195F T-stats and no fan shrouds.
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#13 |
Registered User
Join Date: May 2012
Location: murfreesboro, TN
Posts: 743
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Re: oil pressure light on-question
If you've seen the stock fan shroud for mine in like putting foil over the fan to prevent fingers
Posted via Mobile Device
__________________
![]() . bagged and soon to be bodied 70 longbed http://67-72chevytrucks.com/vboard/s...d.php?t=564028 |
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