C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Water pump is out!

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Old Dec 28, 2006 | 01:21 PM
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Default Water pump is out!

What a pain! Fortunately, it wasn't quite as bad as I made it out to be in my head.

Curiously, I'm not sure if it was leaking from the weep hole or not. The inlet/outlet sides of the pump are soaked on the bottom, but not the weep hole so much. I'm sure it's dried some though, and that is evident.

The Opti appears to be dry as well. A little bit of grease/grime on it, but overall from an outward appearance, it doesn't look to be cooland soaked. The plug wires at the Opti have a little bit of coolant on them, but that's probably from what leaked as I was removing the water pump.

Project is in progress. I wanted to get the car tore apart before I decided what all to replace. I guess I should go ahead and do the plug wires at a minimum, but I just can't convince myself to do the Opti yet if it's still working. That's probably foolish talk I know.

Pictures and updates to come. Now to go about the fun task of removing the gasket material from the block. Not looking forward to that at all. Argh what to do with the rest of it.
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Old Dec 28, 2006 | 01:28 PM
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Originally Posted by Gixster
Now to go about the fun task of removing the gasket material from the block. Not looking forward to that at all.
That's the hardest part of the whole project. I use a single edge razor blade to remove those gaskets.

FYI: Put a light coat of RTV sealant on each side of the water pump's new gaskets. It'll make removing the gaskets much easier next time.


-Mike
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Old Dec 28, 2006 | 01:57 PM
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I stuffed blue shop towels into the block and used a 3M Scotch Brite pad to get the old off and the surface was shiney and smooth.

Indeed the RTV is the ticket if nothing else it will hold the new gasket in place durring reassembly.

I treat it like contact cement in that I put some on the pump thin and smooth then some on the pump side of the gasket and let them start to get tacky before mating them to each other. Then when I'm ready to put the pump on I put some on the block and the block side of the gasket.

Oh yeah I had to use sandpaper I think 800 grit to remove small burs from the new pump so that it would be as smooth as the block.

I kept the old pump because "someday" I might make it into an electric.

While you're in there you may wish to consider plugs and wires.
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Old Dec 28, 2006 | 02:16 PM
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Standard Abrasives makes a great kit for this. It's a little wheel for the drill with different pads for taking gaskets off cast iron or aluminum. Works terrific.
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Old Dec 28, 2006 | 04:54 PM
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If that's an original 94 opti you should think again about replacement. Its exterior appearance means nothing.

At the very least pull it off and open it up. You will find lots of rust.

Of course, to do that you will have to do battle with the balancer. If you think the WP was a problem...
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Old Dec 28, 2006 | 06:15 PM
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Originally Posted by Vis Croceus
If that's an original 94 opti you should think again about replacement. Its exterior appearance means nothing.

At the very least pull it off and open it up. You will find lots of rust.

Of course, to do that you will have to do battle with the balancer. If you think the WP was a problem...
The crank pulley/balancer has to come off to get the opti off?
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Old Dec 28, 2006 | 10:53 PM
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Well, I finally got the Opti out. It wasn't too bad either.

I'm going to dismantle it tomorrow and have a look see. One thing that I find curious. The back of mine doesn't look like the others I've seen pictured here. The others appear to have rounded openings at 120 degrees apart.

Mine is basically one large circle, with a keyed slot at the top. Is this specific to the early Opti or am I just the first one to make mention of it being different?

Thanks gang! I'll post pics tomorrow.
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Old Dec 29, 2006 | 04:05 AM
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Originally Posted by Gixster
Mine is basically one large circle, with a keyed slot at the top. Is this specific to the early Opti or am I just the first one to make mention of it being different?
Yep, that's an early opti.
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Old Dec 29, 2006 | 04:06 AM
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Originally Posted by Mojave
The crank pulley/balancer has to come off to get the opti off?
Yes. But, the hub can stay in place.
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Old Dec 29, 2006 | 10:46 AM
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Something else I noticed that dawned on me this morning. When I pulled the Opti, the drivegear stayed in the motor. When I reinstall, should i pull the drivegear and put it in the Opti prior to installation, or does it matter?
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Old Dec 29, 2006 | 02:32 PM
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Gix', I really don't think it matters. But, it can be a bit tricky to get realigned.
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Old Jan 1, 2007 | 05:53 PM
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I'm just going to beat my head on something now.

After painstakingly putting the car back together, I fired it up and the MSD/plugs/wires are on right, as the car sounds great.

The bad news? The damn new water pump is leaking! I'm not sure where from yet. I had hell with the gaskets, so I'm assuming (hoping) that's it and will be a relatively simple fix.

Argh! At least this time it won't take me as long to dismantle the car.
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Old Jan 1, 2007 | 07:08 PM
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Originally Posted by Gixster
I'm just going to beat my head on something now.

After painstakingly putting the car back together, I fired it up and the MSD/plugs/wires are on right, as the car sounds great.

The bad news? The damn new water pump is leaking! I'm not sure where from yet. I had hell with the gaskets, so I'm assuming (hoping) that's it and will be a relatively simple fix.

Argh! At least this time it won't take me as long to dismantle the car.
Bummer, I had a gasket slip when re-installing my new WP. Luckily, I could see that it had slipped and pulled the W/P back off before I stuck any bolts in. The trick seems to be to get a good "tack" with the permatex and attach the gaskets to the W/P. I put the permatex on both sides of the gasket and on the W/P mounting surfaces. Wait a few minutes to let it get tacky, and press the gaskets onto the W/P... If you don't get enough tack, they will tend to slide off when you go to install the W/P....

Then carefully lower it into its mounting position without hitting anything that could displace or nudge the gasket out of place.

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