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No oil pressure

Tenper616

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So I just replaced the engine in my 1998 Mazda b2500, put a remanufactured long block in it, got just about everything buttoned up and while filling the coolant up I started the engine to get the coolant flowing, let it run for about 5 seconds or so and I've got no oil pressure, at all, so I I shut her down, started it up again for a few more seconds, about three more, and no oil pressure still, how long should I wait on a remanufactured long block that has already been tested for oil pressure at the factory?
 


SenorNoob

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Five seconds sounds about right to me... How do you know you have no oil pressure? Light, gauge, noise?
 

alwaysFlOoReD

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Use the "clear flooded engine" procedure. Press the gas pedal to the floor. That shuts off the fuel injectors. Then crank away. If the motor tries to start then you have a leaking injector. Or stretched throttle cable.
 

rusty ol ranger

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You hooked the sender wire up didnt ya?
 

Tenper616

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I've hooked the sender up, yes, I hadn't thought of holding my foot to the floor, and no not on this motor there's not, and yes gauge sound and light
 

rusty ol ranger

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I've hooked the sender up, yes, I hadn't thought of holding my foot to the floor, and no not on this motor there's not, and yes gauge sound and light
Id unhook the coil wire/coil pack plug and crank it so that way you know it wont start. Even doing the foot on the floor it might start and rev to the moon before you lay off, not good with no oil pressure,
 

Tenper616

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So I'm gonna pull the fuel pump fuse and the coil plugs, AND put my foot to the floor for redundancy reasons, and see if I can get some oil circulation today when I get home, I'll let everyone know what happens
 

55trucker

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It's a fair bet to assume that at the machine shop that built the engine they would use a mechanical pressure gauge & not an electrical gauge to monitor the pressure, try doing the same.
 

RonD

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If valve train was not making noise then its a sender/gauge fault not low oil pressure

And don't rule out a blocked NEW filter, "new" just means NEVER EVER TESTED, not "it works"
 

Tenper616

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It was making noise, as I'm sure I've mentioned before, usually I have the oil pump and prime it myself before installing it, but seeing as I dident install it and was told that the shop tested it all I figured it wouldn't need to be primed
 

rusty ol ranger

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It was making noise, as I'm sure I've mentioned before, usually I have the oil pump and prime it myself before installing it, but seeing as I dident install it and was told that the shop tested it all I figured it wouldn't need to be primed
Id haul it right back to the shop
 

Tenper616

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I did the work myself as I am a mechanic, just was looking for a way to prime the pump with out removing it, which I ended up doing, after I bench primed the pump it pumped up no problem, truck is running fine, few kinks to work through, has at least one vacuum leak I'll have to find, but other than that it's good
Id haul it right back to the shop
 

rusty ol ranger

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177 CID
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Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
I did the work myself as I am a mechanic, just was looking for a way to prime the pump with out removing it, which I ended up doing, after I bench primed the pump it pumped up no problem, truck is running fine, few kinks to work through, has at least one vacuum leak I'll have to find, but other than that it's good
Good to hear
 

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