I guess it wouldn't be a ZR-1 without an oil leak.

[Erik]

Parked inside since the weekend, and I took a look at her today. Found a nice puddle under the front of the engine. It already has Jerrys oil cooler lines, so I doubt it is that. Was pretty dark too, so I'll have to check again in the AM.

Only thing I can imagine is engine oil, or PS fluid?

[XfireZ51]

Check oil pump access cover and cam sensor seal. I had both happening at the same time.

[Erik]

Check oil pump access cover and cam sensor seal. I had both happening at the same time.

Will do.
Are they easily repairable, or is it a special part required, otherwise known as another Jerrys order?

[Ccmano]

Passenger side?
H
:cheers:

[Erik]

Passenger side?
H
:cheers:

Could be.
I'll know more tomorrow.

What's on the passenger side?

[secondchance]

Could be.
I'll know more tomorrow.

What's on the passenger side?

On the oil filter housing facing forward low an hidden - oil temp sensor
On top of oil filter housing - oil pressure sensor
Right side of filter housing facing down - low oil pressure warning sensor
Under and behind low oil pressure sensor - cam chain tensioner port
Above oil pan - crankshaft sensor
Under the crankshaft sensor, on the oil pan - low oil level sensor

Of course, oil pan gasket can be a source of oil leak also.

Oil leak can be any of above or combination of above locations.

[Ccmano]

On the oil filter housing facing forward low an hidden - oil temp sensor
On top of oil filter housing - oil pressure sensor
Right side of filter housing facing down - low oil pressure warning sensor
Under and behind low oil pressure sensor - cam chain tensioner port
Above oil pan - crankshaft sensor
Under the crankshaft sensor, on the oil pan - low oil level sensor

Of course, oil pan gasket can be a source of oil leak also.

Oil leak can be any of above or combination of above locations.

Yup, lots to leak...
H
:cheers:

[Erik]

On the oil filter housing facing forward low an hidden - oil temp sensor
On top of oil filter housing - oil pressure sensor
Right side of filter housing facing down - low oil pressure warning sensor
Under and behind low oil pressure sensor - cam chain tensioner port
Above oil pan - crankshaft sensor
Under the crankshaft sensor, on the oil pan - low oil level sensor

Of course, oil pan gasket can be a source of oil leak also.

Oil leak can be any of above or combination of above locations.

Iirc, we did all the sensors. So I'm guessing that narrows it down some. Plus, previous owner had the oil pan dealt with. So that should make the options just a few.....

We will see next week when she is in the air.

[XfireZ51]

On the oil filter housing facing forward low an hidden - oil temp sensor
On top of oil filter housing - oil pressure sensor
Right side of filter housing facing down - low oil pressure warning sensor
Under and behind low oil pressure sensor - cam chain tensioner port
Above oil pan - crankshaft sensor
Under the crankshaft sensor, on the oil pan - low oil level sensor

Of course, oil pan gasket can be a source of oil leak also.

Oil leak can be any of above or combination of above locations.

You can immediately eliminate all the ones that are easy to get to.

[Erik]

You can immediately eliminate all the ones that are easy to get to.

Thanks for that note of encouragement. :)

[Erik]

Been cold, snowy and miserable, so I finally got out today to take a look at her. I had put a fresh piece of cardboard underneath to get a better feel for where the leak was, and how much was leaking.

So what did I find today? Yup, a completely dry piece of cardboard. Not a drop on it. Great.

[-=Jeff=-]

I had I leak on my car since I got it..

I found the Breather box bolts loose, and the gasket was hard as a rock, replaced the gasket and used blue loctite on the bolts.. I thought it was fixed, but leak was still there, but less. For me it ended up being the Crank Sensor.. Now the car currently does not leak

[Paul Workman]

I agree w/ Jeff.:thumbsup:

Just to add: in my case the injector housing bolts too were not anywhere near torque spec. If you have oil in the valley, chances are it is either the breather box (as Jeff said) OR those IHs.

New gaskets and some BLUE LOCTITE on the bolts will solve those issues! (Be sure to use the (FSM) torque sequencing on the IHs

[Erik]

Oil leak has gone from a handful of spots under the car to a nice puddle now. Going to sickbay on Friday for a checkup. I'll definitely give everyone's comments to him to help narrow it down.

The oil was down a quart and change, so I topped it up, and the leak seemed to get bigger. Does that suggest any specific spot to look at?

[-=Jeff=-]

Have you looked to signs on the top of the motor to see if it is starting there?

[Erik]

Have you looked to signs on the top of the motor to see if it is starting there?

Any places in mind? I haven't noticed anything.

[-=Jeff=-]

Front of motor behind the alternator or compressor. That will tell if it is breather box. On the ground where is the puddle? Many have issues with the sensors on the front right (oil adapter).

What has been looked at in the past for the leaks? What has been attempted as a fix?

[Erik]

Front of motor behind the alternator or compressor. That will tell if it is breather box. On the ground where is the puddle? Many have issues with the sensors on the front right (oil adapter).

What has been looked at in the past for the leaks? What has been attempted as a fix?

All the sensors were swapped in the last 6-8 months. Oil lines were tightened. That's about it IIRC.

I'll have a behind the Alternator.

Looks to be right in the front of the engine. I can try to narrow it down.

[-=Jeff=-]

You able to get under the car? Oil pan bolts could be loose

[Erik]

You able to get under the car? Oil pan bolts could be loose

She will be up on a hoist on Friday too. I'll have that checked also.

[A26B]

The most common culprit for drips progressing to a puddle is the Low Oil Pressure Warning Light Switch, which is not easily visible, or to reach for that matter. It leaks oil through the switch, into the electrical connector. Remove the electrical connector and look for oil.

It is the picture on the left in the image below.
https://cdn10.bigcommerce.com/s-nkg90o/product_images/uploaded_images/oil-filter-adapter-sensors.jpg?t=1468595781

[Erik]

The most common culprit for drips progressing to a puddle is the Low Oil Pressure Warning Light Switch, which is not easily visible, or to reach for that matter. It leaks oil through the switch, into the electrical connector. Remove the electrical connector and look for oil.

It is the picture on the left in the image below.
https://cdn10.bigcommerce.com/s-nkg90o/product_images/uploaded_images/oil-filter-adapter-sensors.jpg?t=1468595781

Thank you, sir.
I think I bought that switch from you, but maybe it didn't get installed. I'll double check.

[A26B]

I may have overlooked it but didn?t see it in the orders I checked.


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[Erik]

I may have overlooked it but didn?t see it in the orders I checked.


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

And I thought I had bought one of everything from you by now. :)

Order incoming!

[Erik]

The most common culprit for drips progressing to a puddle is the Low Oil Pressure Warning Light Switch, which is not easily visible, or to reach for that matter. It leaks oil through the switch, into the electrical connector. Remove the electrical connector and look for oil.

It is the picture on the left in the image below.
https://cdn10.bigcommerce.com/s-nkg90o/product_images/uploaded_images/oil-filter-adapter-sensors.jpg?t=1468595781

Jerry, as I'm putting an order together, any other likely culprits I should add?

[A26B]

Another known source of oil leak in the same proximity is the Oil Pump Access Cover. Difficult to get to. Here is a link to a new gasket .

https://www.jerrysgaskets.com/gasket-oil-pump-access-cover-90-95-7-5c8/

Be sure to tighten the 2 bolts alternately, gradually increasing the torque in several incremental steps to insure proper sealing.

[MuRCieLaGo]

The most common culprit for drips progressing to a puddle is the Low Oil Pressure Warning Light Switch, which is not easily visible, or to reach for that matter. It leaks oil through the switch, into the electrical connector. Remove the electrical connector and look for oil.

It is the picture on the left in the image below.
https://cdn10.bigcommerce.com/s-nkg90o/product_images/uploaded_images/oil-filter-adapter-sensors.jpg?t=1468595781

I'm glad I saw this!

I've been chasing an oil leak. I tightened both Oil Pressure Regulation Valve Cover bolts - without success.

It definitely seems to be coming from that Low Oil Pressure Warning Light switch.

Now the question is: how do I change it? Headers are now removed. Also, it doesn't seem to be a single pin connector!

And should I change some other stuff while I'm there? I didn't particularly like removing those headers.

[MuRCieLaGo]

The most common oil leak and nobody can help?

[Erik]

The most common oil leak and nobody can help?

Might be best to try a new thread with your specific problem. Easier to get noticed that way.

[Erik]

Thank you, Jerry. The parts arrived on time and have been installed. From what I can tell, the oil leak has been, at the very least, greatly minimized. I'll check where I've had it parked tonight to see if there is an small drips.

It doesn't seem that the oil pump access cover is a quick and easy job!

[Erik]

The most common culprit for drips progressing to a puddle is the Low Oil Pressure Warning Light Switch, which is not easily visible, or to reach for that matter. It leaks oil through the switch, into the electrical connector. Remove the electrical connector and look for oil.

It is the picture on the left in the image below.
https://cdn10.bigcommerce.com/s-nkg90o/product_images/uploaded_images/oil-filter-adapter-sensors.jpg?t=1468595781

And Jerry comes through again. Took a couple of drives to get all the leftover oil off of it, but after the last 2 drives, the cardboard underneath shows not a drop anymore.

Thanks, Jerry!

[1991 Corvette ZR-1]

Question on the oil temp sensor for gauge readout: looks like a 90-91 can use the 92-95 oil temp sensor if the screw in bushing is changed out on the housing to one which accommodates the 92-95 version, correct? What size bushing is that? Asking because my needle barely lifts off the cold peg for oil temp and new 90-91 oil temp gauge sensors are pretty much extinct.

[Marc Haibeck]

The '92 - '95 sensor fits without the bushing.

Many people have replaced the oil temperature sensor and have been disappointed. The scale on the gauge is non-linear. When the needle is pointed at the second zero in the "100" on the gauge the oil temperature is about 180 degrees. That's normal.

[1991 Corvette ZR-1]

The '92 - '95 sensor fits without the bushing.

Many people have replaced the oil temperature sensor and have been disappointed. The scale on the gauge is non-linear. When the needle is pointed at the second zero in the "100" on the gauge the oil temperature is about 180 degrees. That's normal.

Thanks, Marc!