Pegged Oil Pressure Reading? - Page 2

JohnJL · 03-21-2009, 02:59 PM

Didja try warming it up? My 71 with a 3l does this when its cold.

fredmo1947 · fredmo1947's Garage

Daytona,
Re: removing the sender you need to loosen the two oil line nuts which are connected to the oil pressure sending unit block and return oil to the right side head. Put a shop towel below the block to absorb the oil which will leak out the oil line when you loosen the nuts (makes it a little easier to clean up the mess). After loosening the nuts you can push the sender towards the front of the car to about a 45 degree angle, this will give you enough room to get a wrench on the sender nut and remove the unit.
Fred

Daytona · Daytona's Garage

Fred,
Thanks for the info,I did a search and this topic is well covered. However my one question is the block that the sender is mounted to. Is the block attached with the bolt that the oil line is fastened to?
Larry

fredmo1947 · fredmo1947's Garage

The short answer is yes! The nut closest to the block is actually a fitting that has a male end that passes through the block and attaches onto the engine and the other side of that fitting connects to the oil line.

LeakProof · 03-23-2009, 04:50 PM

Daytona, I just replaced my sender and my first instinct was to use a crawfoot wrench to remove it. I even purchased the tool.
Then found out not to attempt that method of removal!
Remove the bolt, then remove the sender and block together, take to bench then remove sender. I couldn't believe I didn't see that in the first place.

Mike.

Daytona · Daytona's Garage

Leakproof,
Thanks for the info, I did a search which covered this topic. This board undoubtedly is the most thorough resource available. My hat off to all members. I am ordering the sender for this weekends project.
Larry

LeakProof · 03-23-2009, 05:32 PM

No problem Daytona, The job only took about 40 minutes. Luckily I had some extra sealing rings lying around.
I also used some Teflon tape on the threads. Have fun,

Mike

rnln · 03-23-2009, 05:40 PM

MT,
This thread might help. http://forums.pelicanparts.com/showthread.php?t=408794&highlight=crowfoot&page=2

MT930 · 03-23-2009, 07:12 PM

rnln Thanks for the link.

I am going to drive the car and see if anything changes first. Then rule out everything before I replace the sender. I will know where to go when the time comes. I have not had the car out on the road yet, still winter here with some nice days in between. I need to run the wiring down next just printed the diagram from the manual.

myamoto1 · myamoto1's Garage

rnln's link is priceless. it got me through replacing my pressure sender.

MT930 · 04-10-2009, 06:02 PM

I am back on this problem, first day worthy of a cruse

Took the car for a 30min drive warmed up fully still pegged.

What is the next step I want to rule out every thing except the sender.

if I can do that and find nothing I will order a sender.

MT930 · 04-10-2009, 07:15 PM

Quote:

Originally Posted by vreference

Key on, Engine Off ( "KOEO" Key in the run position) you should have a 0 (Zero) reading. If it's at 5 with the key on but before the engine is running then it's the sender or the wiring. If this is the case you can unplug the sender to attempt to isolate the issue. That is, with the sensor unplugged (KOEO) you still read 5 it's an issue with the gauge or the harness. If the gauge reads zero after unplugging the sender, the sender is faulty. If you only read 5 Bars with the engine running (KOEO)it could still be a gauge or sending unit failure (wiring is less likely). The other possibility is a mechanical issue such as a failed bypass valve.

Tried this sender unpluged KOEO still pegged.

Where should I be looking next?

MT930 · 04-11-2009, 12:16 PM

Leaning toward the sender I am getting Voltage at the sender 7.66 Volts Key on run engine off.

MT930 · 04-20-2009, 08:25 PM

New sender in from Pelican.

I will proceed with the method described in the link http://forums.pelicanparts.com/showt...rowfoot&page=2

Thanks rnln

Question:

Theoretically if I plug in the new sender and ground it to the block with the ignition on engine off I should see 0 Bar druck pressure ? I it's verry tight in there I just want finally rule out the sender before I take it out and replace.

fredmo1947 · fredmo1947's Garage

That's is how I would test the new sender, and if it is all working correctly with the key on and engine off the oil pressure should read zero. Be sure to get a good ground on the new sender. I would be sure to check the ground with a test light.
Fred

MT930 · 04-22-2009, 10:55 AM

Sensor replaced working as it should.

This was a exhausting part replacement due to the space confines of the turbo engine and air con compressor unit. I would not have gotten this done with out this thread
http://forums.pelicanparts.com/showt...rowfoot&page=2

and some friends that had some out of the box mechanical techniques.

sabeo.m · sabeo.m's Garage

My oil pressure gage was pegging at 5 all the time, I cleaned both the wire and oil pressure sender terminal. I removed the oil level + Druck Press gage and checked connections... I unplugged the red/blk wires & grn wire on the druck side of the gage-reconnected them. Next, i made sure all the Brown-ground wires were properly seated. My Druck Press is no longer pegged. Haven't had a chance to fully warm up engine, but i'm getting 4 bar/1k rpm on start up. My engine is rebuilt, it has 3,500 miles on it so far. Presumably it was one of the ground wires...

sabeo.m · sabeo.m's Garage

Engine at normal operating Temp, i'm getting 1 bar @ 950 rpm.