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Oil Sending Unit....Help!

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Old Oct 1, 2007 | 06:58 PM
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Default Oil Sending Unit....Help!

Okay guys and gals. I've read the sticky/threads in C5 Tech, but I'm not sure I'm wanting to tackle this job myself.

Any idea how many $$'s the stealership will gouge me to replace this? Also, does it really hurt to drive it with a bad sending unit?
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Old Oct 1, 2007 | 07:03 PM
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Doesn't hurt anything to drive with a bad sender.

Dealer will hit you about $350 to install the $40 part

There is a thread posted on the Forum somewhere on how to cut the plastic under the windshield wiper cowling to access the OS with out removing the intake.

I did it a couple of months ago on a guys C5. It was very easy.
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Old Oct 1, 2007 | 07:09 PM
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Originally Posted by Vega$Vette
Doesn't hurt anything to drive with a bad sender.

Dealer will hit you about $350 to install the $40 part

There is a thread posted on the Forum somewhere on how to cut the plastic under the windshield wiper cowling to access the OS with out removing the intake.

I did it a couple of months ago on a guys C5. It was very easy.
You're good! I just called the dealer and they quoted $350.00, plus maybe a few gaskets, etc.

He said the same also, that it wouldn't hurt to drive it as long as it is not leaking (which it isn't).

I may just have to try the "cut" method.
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Old Oct 1, 2007 | 07:37 PM
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Originally Posted by IrishMac
You're good! I just called the dealer and they quoted $350.00, plus maybe a few gaskets, etc.

He said the same also, that it wouldn't hurt to drive it as long as it is not leaking (which it isn't).

I may just have to try the "cut" method.
The one I changed was leaking from the sender thru to the electrical plug connection and was just a little wet around the wires. It was not dripping that you could see on the ground or anything.

The key to the "cutting" method is to cut the hole larger then you think you need. I cut about 1 1/2 " x 4". Should have made it 2" x 6". When your done you put the piece in with RTV and you never see it after you put the cowl back on. Nice thing is you can just cut the RTV if you need to change the sender again.

Only real trick was getting a thin wall socket as there is a bolt right next to the sender that requires the use of a thinwall socket. I ended up buying a $8 socket and grinding the wall thinner to fit. About 5 minutes with my dremel.

Took me about an hour to change it including the time to grind the socket and put away my tools.

Last edited by Vega$Vette; Oct 1, 2007 at 07:39 PM.
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Old Oct 1, 2007 | 07:48 PM
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I have also read that the Delco sending unit will fail. There is a non USA produced sending unit that works best.

I need to change mine. Been driving it for almost a year. I have not seen the thread where you can change it without removing the intake. Would love to see that one!

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Old Oct 1, 2007 | 07:55 PM
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Originally Posted by Vega$Vette
The one I changed was leaking from the sender thru to the electrical plug connection and was just a little wet around the wires. It was not dripping that you could see on the ground or anything.

The key to the "cutting" method is to cut the hole larger then you think you need. I cut about 1 1/2 " x 4". Should have made it 2" x 6". When your done you put the piece in with RTV and you never see it after you put the cowl back on. Nice thing is you can just cut the RTV if you need to change the sender again.

Only real trick was getting a thin wall socket as there is a bolt right next to the sender that requires the use of a thinwall socket. I ended up buying a $8 socket and grinding the wall thinner to fit. About 5 minutes with my dremel.

Took me about an hour to change it including the time to grind the socket and put away my tools.

I just have a hard time thinking about cutting a hole in the vette, but to save $400.00, I just may.
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Old Oct 1, 2007 | 08:00 PM
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Originally Posted by Ta-taaa
I have also read that the Delco sending unit will fail. There is a non USA produced sending unit that works best.

I need to change mine. Been driving it for almost a year. I have not seen the thread where you can change it without removing the intake. Would love to see that one!

It's in this thread. Kind of long, but VERY informative. You'll have to read thru it to find the method for cutting the cowl though.
http://forums.corvetteforum.com/show....php?t=1588172
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Old Oct 1, 2007 | 08:05 PM
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Originally Posted by IrishMac
It's in this thread. Kind of long, but VERY informative. You'll have to read thru it to find the method for cutting the cowl though.
http://forums.corvetteforum.com/show....php?t=1588172
Thanks!!
I might be missing it, but I don't see where it says how or where to cut the hole...
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Old Oct 1, 2007 | 08:21 PM
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Originally Posted by Vega$Vette
Only real trick was getting a thin wall socket as there is a bolt right next to the sender that requires the use of a thinwall socket. I ended up buying a $8 socket and grinding the wall thinner to fit. About 5 minutes with my dremel.

Took me about an hour to change it including the time to grind the socket and put away my tools.
Could have saved yourself half an hour and $2...Auto Zone has a specific socket for this, and I think I paid $6 for it. Made by Great Neck.
I had already purchased a socket at Sears to destroy and stumbled across this one.
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Old Oct 1, 2007 | 08:24 PM
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Here you go. It's very easy. The hole is cut just left of center (drivers side of center.

http://forums.corvetteforum.com/show...1588172&page=4
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Old Oct 1, 2007 | 08:40 PM
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Originally Posted by Vega$Vette
Here you go. It's very easy. The hole is cut just left of center (drivers side of center.

http://forums.corvetteforum.com/show...1588172&page=4
Yesssssssssss !! This will help alot. I did not feel like pulling the intake..

Thanks!

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Old Oct 1, 2007 | 10:39 PM
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On the other hand, pulling the intake is not difficult.
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Old Oct 1, 2007 | 10:58 PM
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It did not take me more than 2 1/2 hrs following Vectorz detailed instructions.
I'd gladly spend more time than that rather than cutting a hole in my baby.
I'm sure that now that I know what I'm doing It could do it in 2 hrs or less.
10K miles since the change. I put in the AC/Delco part.... meticulously cleaned the connectors and torqued it to exactly 15 ft-lbs.
While under the intake, I cleaned out some carbon deposits
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Old Oct 1, 2007 | 11:08 PM
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Originally Posted by rws.1
It did not take me more than 2 1/2 hrs following Vectorz detailed instructions.
I'd gladly spend more time than that rather than cutting a hole in my baby.
I'm sure that now that I know what I'm doing It could do it in 2 hrs or less.
10K miles since the change. I put in the AC/Delco part.... meticulously cleaned the connectors and torqued it to exactly 15 ft-lbs.
While under the intake, I cleaned out some carbon deposits
Good point- cleaning the inside of your manifold and even your runners (heads). But to be fair, some of these guys are worried more about the next time they have to replace their senders.
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Old Oct 1, 2007 | 11:14 PM
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Originally Posted by RJ1AZ
Could have saved yourself half an hour and $2...Auto Zone has a specific socket for this, and I think I paid $6 for it. Made by Great Neck.
I had already purchased a socket at Sears to destroy and stumbled across this one.
What size is the socket?
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Old Oct 1, 2007 | 11:37 PM
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I personally think its easier to just pull the manifold. It took me about an hour to do it. It was my first time. My cousin has worked on quite a few vettes, dealer tech. He gave me a little tip on the sensor, tighten it down until the crush washer crushes flat and then give it a small tug. You do not have to disconnect the fuel line or replace the intake gaskets. Ive gone almost 500 miles and gage is still working fine.........
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Old Oct 2, 2007 | 12:24 AM
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Originally Posted by Junkman2008
What size is the socket?
1-1/16" (didn't notice before, but it also fits 1"...there's a lip up inside the socket to fit a 1")
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To Oil Sending Unit....Help!

Old Oct 2, 2007 | 09:41 AM
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I have to replace mine, I just dont want to go through the hassle of removing intake and crap!!
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Old Oct 2, 2007 | 09:08 PM
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Originally Posted by MIKE-C5
I have to replace mine, I just dont want to go through the hassle of removing intake and crap!!
I hear ya Mike. I wonder if there are any other components that should/might be replaced since the intake manifold is already off?
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Old Oct 2, 2007 | 09:25 PM
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As for other parts to consider while the intake is off. On my '98 I replaced the PCV hose assembly and the small vaccum hose in the rear of the intake needed to be lengthened for ease of reinstallation. I used the old intake gaskets over again no trouble 2,000 miles later.


Dave
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