Oil gauge dropping off after start up.

[wrdriggs]

truck just recieved an overhaul, did new cyl heads, arp studs the whole 9 etc....

truck starts up and runs great. after start up usually about 10-15 sec the check gauge light will come on and the oil pressure guage in the cluster will drop off.

talked to a international tech and he said its common that after a overhaule there will be air pockets in the HPOP and take about 15-20 min of driving to get the air out... any other ideas? sound likley?

just finished the truck up this weekend and havnt had anytime to get back into it and start any diag but wondering if this is common or someone could point me int he right direction. thanks!

[mhatlen]

Replace the oil pressure switch, notice I didn't say (oil pressure sensor) !?

It's a 7psi pressure switch and if the truck is running your switch is bad the truck would die if the pressure was that low because the hpop would go dry.
It's possible that you have a bad connection just more likely your switch is no good.
Post up how you do with a new one...........I'm sure that's your problem

[wrdriggs]

Originally Posted by mhatlen

Replace the oil pressure switch, notice I didn't say (oil pressure sensor) !?

It's a 7psi pressure switch and if the truck is running your switch is bad the truck would die if the pressure was that low because the hpop would go dry.
It's possible that you have a bad connection just more likely your switch is no good.
Post up how you do with a new one...........I'm sure that's your problem

ordered a OEM one today will see it tomorrow so i will post back and let you know..


also noticed if i rev it to 2-3k the guage will come back to life for a few sec then die out again.

[mhatlen]

Your fine, that switch is shot, like I said your truck would NOT run if your pressure was at 7 psi, that is the pressure that closes that switch. Its really a joke that International even put that config in but they didn't feel it was all that was necc.

[wrdriggs]

well figured id just give an update incase anyone searches for oil pressure issues and this thread comes up, yep it was just the sensor, got a brand new OEM one and it fixed the issue!

[iHenry]

Originally Posted by wrdriggs

well figured id just give an update incase anyone searches for oil pressure issues and this thread comes up, yep it was just the sensor, got a brand new OEM one and it fixed the issue!

When you replaced the sending unit What size socket was it. Looks like 1 1/16, but before I run out and buy one, though I'd ask. Also, did it come out easy or did you have to play around with it? Thanks.