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05-15-2024, 02:32 PM
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#1 |
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Almost Satisfied
 
Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,932
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Oil Pressure Readings
85 with 350. Have the dual oil pressure sensors.
I swapped the motor/trans/body from a 2500 frame to a SWB 1500 frame. Oil pressure gauge worked prior. We fired up the motor after the swap and the gauge is all over the place. It jumps from 20 to 70 and back. It acts like a ground issue but not sure what could have changed there. Any ideas?
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." |
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05-16-2024, 12:31 AM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,611
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Re: Oil Pressure Readings
Wire damaged/smashed during engine xfer? Same for sender. Doesn't take much.
Same engine/sender/gauge/wiring harness combo? |
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05-16-2024, 05:28 PM
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#3 |
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Almost Satisfied
Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,932
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Re: Oil Pressure Readings
All the same stuff. No damage to wires or senders
__________________
1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." |
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05-17-2024, 02:46 PM
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#4 |
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Registered User
Join Date: Dec 2011
Location: WA
Posts: 378
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Re: Oil Pressure Readings
Is it physically possible for the oil pressure to jump and fluctuate by 50psi?
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05-17-2024, 07:18 PM
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#5 |
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Registered User
Join Date: Sep 2014
Location: Central MN
Posts: 288
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Re: Oil Pressure Readings
What year truck was the engine swapped into?
Do you have the head to firewall ground hooked up?
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-400/400 1979 K25 350/SM465/205/44HD/14FF 1985 K20 400/400/208/10/14 1987 V10 TBI350/700R4/208/10/10 '85 Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=643968 |
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05-20-2024, 07:46 PM
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#6 | |
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Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 766
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Re: Oil Pressure Readings
As said by 400/400
Quote:
And I would make sure your ground to the engine to frame is hooked and make sure there all grounds are cleaned. test the ground to make sure 100% not less. Coat the connection bolts to metal water dissipater but still lets an electric flow throw. The two grounding straps if to corroded when moved unbolted re-bolted make less then 100% connection or connection that come goes as it pleases. It will drive you nut looking it. Clean the wires or get a new wire. Test with a multimeter that you're getting 100% ground flow.
__________________
 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bedWas a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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05-20-2024, 07:56 PM
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#7 |
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Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 766
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Re: Oil Pressure Readings
Oh make sure your gauge cluster ground is good at the side of the cab body near the kick panel and dash or the column to the cab. There is a few grounds there on one bolt.
__________________
1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bedWas a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. |
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