Oil Pressure/Sender
Thread Starter
Pro
Joined: Apr 2005
Posts: 603
Likes: 2
From: Illinois, USA
Oil Pressure/Sender
I have a '77 L-48 that was rebuilt about 1 year ago (previous owner), and I'm trying to track down a high oil pressure reading on the gauge.
At start/run/idle the pressure is always reading 80 psi. Now, if the pressure was really that high, I would expect oil problems, but I haven't detected any (and I haven't purchased a mechanical to verify).
My first thought is a bad sending unit, but I can't definitively identify it. I found the oil pressure switch, but switch nomenclature doesn't indicate variable output. Is the switch the ticket? Could the guage also be at fault?
I'm placing a parts order and I wanted to know if I should replace the oil pressure switch (esp if it fixes this problem).
Brian.
At start/run/idle the pressure is always reading 80 psi. Now, if the pressure was really that high, I would expect oil problems, but I haven't detected any (and I haven't purchased a mechanical to verify).
My first thought is a bad sending unit, but I can't definitively identify it. I found the oil pressure switch, but switch nomenclature doesn't indicate variable output. Is the switch the ticket? Could the guage also be at fault?
I'm placing a parts order and I wanted to know if I should replace the oil pressure switch (esp if it fixes this problem).
Brian.
Thread Starter
Pro
Joined: Apr 2005
Posts: 603
Likes: 2
From: Illinois, USA
Originally Posted by comp
a test is a good idea 
I just am hung up on the idea of "switch" driving a gauge -- switch suggests binary, and "sending unit" suggests variable -- but that doesn't appear to hold true here. I guess I'll worry about that at the same time my vette stops leaking things <grin>
Thread Starter
Pro
Joined: Apr 2005
Posts: 603
Likes: 2
From: Illinois, USA
I did find one locally for about $16 -- and when I installed it, I had about 42 psi at cold idle ...I must say that made me feel a little more comfortable! 
It was about a 10 minute job (since its up on jack stands with the wheels off).
Now, if siphoning the fluid out of the rear differential was so fast ...I'm going on 2 hours with that.
Thanks for everyone's help. One down, many to go.
Brian.
It was about a 10 minute job (since its up on jack stands with the wheels off).
Now, if siphoning the fluid out of the rear differential was so fast ...I'm going on 2 hours with that.
Thanks for everyone's help. One down, many to go.
Brian.
