73 Black and Tan
New Forum User
I could use a bit of help here... (73 240Z running L28 block).
I'm in the middle of a project and I'm having oil pressure issues that I haven't been able to diagnose.
Before my current project I would often get low oil pressure once it was warmed up and when at idle. Wasn't sure if it was the pump, the sensor, the engine, or something else. So I went to see if I could 'fix' this problem while doing some other work..
This current project has me doing the following: removing the timing cover to fix a leak, new oil pan (baffled Arizona Zcar), new hoses, new belts, new water pump, new oil pump internals (went to add a high flow version but turns out it was the same as I already had, thanks prior owner, installed the new stuff anyway), new oil pressure sensor, new oil filter, oil change with added oil for the new larger pan, and a coolant flush.
Issue: finished all of the above and whet for a drive. The oil pressure was higher than normal, not off the chart, but higher than before, near the end of the drive pressure was showing zero when at speed. I pulled over and did a visual and audible inspection. Nothing seen or heard.. limped it back home for further evaluation.
I got a mechanic oil pressure gauge, took out the oil pump shaft and reinstalled the pump to spin it with my cordless drill, it showed oil pressure!
But when I put it all back together, and pull the spark plugs and crank it still shows zero?!
I took a video of the shaft with the distributor off while I was cranking it to see if the shaft was actually engaged and spinning, it's spinning just fine.
Any ideas what's going on?
My fear is that my drill is spinning faster than the car rotates while cranking and that speed is needed to make pressure (probably not a good root cause to this).
Before I admit that the summer driving season is over and I pull the engine for internal issues, is there anything else I should/could look into?
Thanks in advance for any help.
-Will
I'm in the middle of a project and I'm having oil pressure issues that I haven't been able to diagnose.
Before my current project I would often get low oil pressure once it was warmed up and when at idle. Wasn't sure if it was the pump, the sensor, the engine, or something else. So I went to see if I could 'fix' this problem while doing some other work..
This current project has me doing the following: removing the timing cover to fix a leak, new oil pan (baffled Arizona Zcar), new hoses, new belts, new water pump, new oil pump internals (went to add a high flow version but turns out it was the same as I already had, thanks prior owner, installed the new stuff anyway), new oil pressure sensor, new oil filter, oil change with added oil for the new larger pan, and a coolant flush.
Issue: finished all of the above and whet for a drive. The oil pressure was higher than normal, not off the chart, but higher than before, near the end of the drive pressure was showing zero when at speed. I pulled over and did a visual and audible inspection. Nothing seen or heard.. limped it back home for further evaluation.
I got a mechanic oil pressure gauge, took out the oil pump shaft and reinstalled the pump to spin it with my cordless drill, it showed oil pressure!
But when I put it all back together, and pull the spark plugs and crank it still shows zero?!
I took a video of the shaft with the distributor off while I was cranking it to see if the shaft was actually engaged and spinning, it's spinning just fine.
Any ideas what's going on?
My fear is that my drill is spinning faster than the car rotates while cranking and that speed is needed to make pressure (probably not a good root cause to this).
Before I admit that the summer driving season is over and I pull the engine for internal issues, is there anything else I should/could look into?
Thanks in advance for any help.
-Will