Relocating Oil pressure sending units to fender
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Re: Relocating Oil pressure sending units to fender
by Sierra » Fri Nov 06, 2009 10:49 pm
Did anyone else see a drop in oil pressure on the guage when hot? my stock guage is reading zero to 5 when hot and 20-30 first thing in the morning
1985 GMC 4x4 T-15 X-Cab Sierra : 22 Gal tnk : 3:42 G80 : 2" BL : conv. t4 to a t5 : 3.4, Fully Balanced, .10 over, K.B. Hypereutectic Pist., Comp cams 1:6 roller tipped rockers : GM perf. 3.4ht Crate Cam, Springs, Retainers, and Locks : Carb to TBI swap : 2" Bored TBI intake : 4.3 TBI and injectors : High output Alternator : Eldebrock TES headers : Dual LT1 efans, flexlite controller : Aeromotive A.F.R. : 94' Bravada leather bucket seats and door panels : Full Gauge Dash, Inc stk Tach : Added rear jumper seats : and more to come.
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
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Sierra - The never ending project truck
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Re: Relocating Oil pressure sending units to fender
by betterthanyou » Mon Dec 28, 2009 6:34 pm
Yes pressure will drop but you need to have at least 10PSI at idle when hot to have a safe motor. My Trooper was dropping below 7PSI when hot and I had to put in 40 weight oil to keep it safe. When I did the rebuild the wear on the bearings was the obvious cause of the low pressure.
1993 EXT. CAB, 3.4L V6 TBI, 5spd manual
See my site for more info.
Because... I am, CANADIAN
See my site for more info.
Because... I am, CANADIAN
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betterthanyou - Subscribed Tech Editor
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Re: Relocating Oil pressure sending units to fender
by Sierra » Tue Dec 29, 2009 12:10 am
thanks man, that is what I am doing next oil change
1985 GMC 4x4 T-15 X-Cab Sierra : 22 Gal tnk : 3:42 G80 : 2" BL : conv. t4 to a t5 : 3.4, Fully Balanced, .10 over, K.B. Hypereutectic Pist., Comp cams 1:6 roller tipped rockers : GM perf. 3.4ht Crate Cam, Springs, Retainers, and Locks : Carb to TBI swap : 2" Bored TBI intake : 4.3 TBI and injectors : High output Alternator : Eldebrock TES headers : Dual LT1 efans, flexlite controller : Aeromotive A.F.R. : 94' Bravada leather bucket seats and door panels : Full Gauge Dash, Inc stk Tach : Added rear jumper seats : and more to come.
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
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Sierra - The never ending project truck
- Posts: 4200
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- Location: Washington
Re: Relocating Oil pressure sending units to fender
by Sierra » Tue Jun 29, 2010 1:15 pm
Hey Guys How is it going? will I just wanted to update I switched it a 20/50 oil and it is still having the oil drop 
My next thing is to try to locate some sort of inline oil pressure regulator since the stock pump does not seem tobe doing the trick.
My next thing is to try to locate some sort of inline oil pressure regulator since the stock pump does not seem tobe doing the trick.1985 GMC 4x4 T-15 X-Cab Sierra : 22 Gal tnk : 3:42 G80 : 2" BL : conv. t4 to a t5 : 3.4, Fully Balanced, .10 over, K.B. Hypereutectic Pist., Comp cams 1:6 roller tipped rockers : GM perf. 3.4ht Crate Cam, Springs, Retainers, and Locks : Carb to TBI swap : 2" Bored TBI intake : 4.3 TBI and injectors : High output Alternator : Eldebrock TES headers : Dual LT1 efans, flexlite controller : Aeromotive A.F.R. : 94' Bravada leather bucket seats and door panels : Full Gauge Dash, Inc stk Tach : Added rear jumper seats : and more to come.
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
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Sierra - The never ending project truck
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- Location: Washington
Re: Relocating Oil pressure sending units to fender
by betterthanyou » Tue Jun 29, 2010 11:43 pm
Wont work. You cannot increase the pressure of the pump unless you modify the pressure relief spring in the pump. If 50 weight oil will not keep the pressure up you have a problem somewhere.
Culprits are:
Faulty gauge reading
Pickup screen too close to pan bottom.
Worn pump
Worn bearings in engine
If your engine is new or "newer" and you don't think there are wear issues then pick up a cheep mechanical gauge and plumb it into the oiling system somewhere. Run the truck to a hot idle and see what you get. If it looks fine then replace your sending unit and/or gauge in the truck. Most likely it is the sending unit.
Culprits are:
Faulty gauge reading
Pickup screen too close to pan bottom.
Worn pump
Worn bearings in engine
If your engine is new or "newer" and you don't think there are wear issues then pick up a cheep mechanical gauge and plumb it into the oiling system somewhere. Run the truck to a hot idle and see what you get. If it looks fine then replace your sending unit and/or gauge in the truck. Most likely it is the sending unit.
1993 EXT. CAB, 3.4L V6 TBI, 5spd manual
See my site for more info.
Because... I am, CANADIAN
See my site for more info.
Because... I am, CANADIAN
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betterthanyou - Subscribed Tech Editor
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Re: Relocating Oil pressure sending units to fender
by Sierra » Tue Jul 06, 2010 1:51 am
well I do have 26k on it now.
would something like this work?
http://www.summitracing.com/parts/ALM-7121A/
would something like this work?
http://www.summitracing.com/parts/ALM-7121A/
1985 GMC 4x4 T-15 X-Cab Sierra : 22 Gal tnk : 3:42 G80 : 2" BL : conv. t4 to a t5 : 3.4, Fully Balanced, .10 over, K.B. Hypereutectic Pist., Comp cams 1:6 roller tipped rockers : GM perf. 3.4ht Crate Cam, Springs, Retainers, and Locks : Carb to TBI swap : 2" Bored TBI intake : 4.3 TBI and injectors : High output Alternator : Eldebrock TES headers : Dual LT1 efans, flexlite controller : Aeromotive A.F.R. : 94' Bravada leather bucket seats and door panels : Full Gauge Dash, Inc stk Tach : Added rear jumper seats : and more to come.
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
"If a man can build it, I can take it apart and sometimes even put it back together and fix it" --Unknown
"'I wish none of this had happened.' 'So do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given to us.....'" J.R.R. Tolkien
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Sierra - The never ending project truck
- Posts: 4200
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- Location: Washington
Re: Relocating Oil pressure sending units to fender
by jwvess00 » Sun Jul 11, 2010 10:23 am
Hi there!
I don't see why not.
My 2.8 has 45+ PSI cold idle, and ~15 PSI hot idle oil pressure, rising with RPM. I suspect eating a lot of coolant when the head gasket failed did not do the cam bearings any favors... I run Shell Rotella T 15w40 oil as an insurance policy, but the real answer is an engine swap.
Because of the location of the oil pressure sending unit, the V6/60s in our trucks are notorious for high oil pressure readings (my '82 has a 60psi gauge, and my old '84 Blazer has an 80psi gauge from the factory). If you're reading really low oil pressure, and it's not a bad sending unit/gauge/wiring (which makes that mechanical gauge attractive). you're probably in for an engine teardown.
Sierra wrote:well I do have 26k on it now.
would something like this work?
http://www.summitracing.com/parts/ALM-7121A/
I don't see why not.
My 2.8 has 45+ PSI cold idle, and ~15 PSI hot idle oil pressure, rising with RPM. I suspect eating a lot of coolant when the head gasket failed did not do the cam bearings any favors... I run Shell Rotella T 15w40 oil as an insurance policy, but the real answer is an engine swap.
Because of the location of the oil pressure sending unit, the V6/60s in our trucks are notorious for high oil pressure readings (my '82 has a 60psi gauge, and my old '84 Blazer has an 80psi gauge from the factory). If you're reading really low oil pressure, and it's not a bad sending unit/gauge/wiring (which makes that mechanical gauge attractive). you're probably in for an engine teardown.
Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
2006 Pontiac Solstice
1982 Chevrolet S-10 Sport, 2.8V6 TBI
2006 Pontiac Solstice
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jwvess00 - Tech Editor
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