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

replacing LT1 front engine seals

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Old May 23, 2021 | 08:47 PM
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Default replacing LT1 front engine seals

Got the car apart.
Last time I did this, I did it w/o removing the front cover.
I really wanted to do it that way again, as removing the front cover in my case would mean dropping the road race pan

On my searches I found this.
It's on a Camaro, and on the earlier opti drive, but some good tips

A sharpie for a seal installer, I never would have thought of that.

Not sure about a screw in the top seal
there's a slot, but that gave me trouble last time.

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Old May 24, 2021 | 10:35 PM
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I have used the sharpie for that damn 2 lipped seal.. Weird design, that seal.
Good tips, as the LT1 can be a leaker if done wrong.
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Old Jun 9, 2021 | 05:12 PM
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Used TWO screws for the top seal, popped right out

Used the 3in 1/4 extension trick, seems to work

But the bolt that came with my crank hub puller was so long it reached out past the steering rack and over the swaybar.

As soon as it cleared the swaybar BANG!

Car is OK, will look for another puller.


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Old Jun 16, 2021 | 04:40 PM
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FYI if you order a waterpump, they take a while to arrive.

COVID has back ordered a lot of parts.
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Old Jul 5, 2021 | 05:40 PM
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Well my front seals are FINALLY in.

I needed to drop the front swaybar in order to used the puller tool.
The opti seal was in there TIGHT
The crank seal just about fell out

I decided to change the plugs while I have it all about.
While it was apart I picked up a borescope.
Half the cylinders looks like this:


The other half look like this:

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Old Jul 6, 2021 | 12:12 PM
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I thought the pistons were cracked, but then I looked at the valve reliefs

The only thing I can think of is that I lost ignition one some of the cylinders which caused a RICH condition, the computer tried leaning it out, which caused what happened to the other cylinders.

Putting a new cap, rotor, plugs and wires.
I'll do the O2's as well and see what happens when I fire it up.
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Old Jul 10, 2021 | 05:39 PM
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OK so I want to turn the engine slightly to take more pics
Before I do that I need to put the hub mount back on.
Before I do that I want to put the opti back on.
Before I to that I need to tear it down, clean it, and put a new cap & rotor on it.

So, teardown of an 8 year old MSD opti that's been CAKED in oil.

Oil soaked cap. looks like normal wear

fouled connections


rotor wear

I didn't think anything got in there till I took the separator out.

Drenched

cleaned up

The optical wheels comes out. the FRONT is marked

I think the smaller screws that come with the kit are for the STOCK rotor
Reused the old screws with some LOCKTIGHT

Yeah, I got a lot out.

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Old Jul 11, 2021 | 04:01 PM
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OK just spent the afternoon trying to get the opti back on.
I can't get the pin the line up .
This guy did it with the cap off.

Wonder how he keep the seal in place
dabs of silicone?

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Old Jul 12, 2021 | 01:02 PM
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MSD has some further documentation.

It shows is being installed with the cap OFF.

I'll stick the o-ring in place 1st, like a valve cover gasket and see how that works.
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Old Jul 17, 2021 | 04:55 PM
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The "cap off" method worked installing the opti
a little dab of gasket maker kept the o-ring in place so I could install the cap.
Put the lower vent line (suction) on before installing the cap.
Yes, the balancer adapter isn't on all the way.
I installed it just enough so that bring the pin in the cam to the top.
If you put it on all the way, the shaft coming from the opti into the cam is a real PITA to get in there. I'll fully install that next.
Then I'll get the plugs & wires installed.
I'll temporarily hook up the coil & see it it will fire up before putting reinstalling the waterpump and the supercharger.


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Old Aug 7, 2021 | 09:15 PM
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Hooked up the coil to the opti and got the car to fire today.
Repair DONE.
Now to put back everything I took off to get to the seals.
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Old Aug 8, 2021 | 10:07 AM
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Good Job! Stupid question-This car has a supercharger-Right? Which damper do you use as I see the stock hub.

Steve
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Old Aug 8, 2021 | 02:10 PM
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Not stupid question at all.

Vortech supplied a custom balancer with the Kit.
It has additional ribs behind the stock ones to drive the separate belt for the supercharger

You may not have notice but my hub adapter has TWO keyways cut into it.
I'll post a pic later.
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Old Aug 8, 2021 | 07:03 PM
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Here's a pic before it was installed in the car.



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Old Aug 8, 2021 | 07:07 PM
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I had someone else build the engine.
Here's the hub adapter and the bolt that goes into the crank with the thick washer.
Can someone explain to be how this is suppose to hold the hub adapter and with it the balancer on?

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Old Aug 9, 2021 | 10:21 AM
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Did not know they made a damper to bolt onto the stock (type/modified) hub-Cool.

"Can someone explain to me how this is suppose to hold the hub adapter and with it the balancer on?"
How was it when assembled? Do you mean for re-assembly?




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Old Aug 9, 2021 | 11:55 AM
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This is what a stock one looks like.
The shop must have completely hollowed it out when they machined in the two keys


I need to find a wider washer & a bolt long enough to go through the entire assembly
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To replacing LT1 front engine seals

Old Aug 9, 2021 | 11:57 AM
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This is how I reinstalled it
I'll use it as a tool to determine the correct bolt length, only have it go all the way to front of the damper



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Old Aug 13, 2021 | 06:57 PM
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The hub is a press fit, and I have heard over the years people having that bolt be loose, and hub was still tight.
My Hub has the bolt and keyway as Callies cut it for their 3.85 inch stroke in my 396.
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Old Aug 30, 2021 | 11:50 AM
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OK I didn't realize fixing my car was going to involved irradiating the honet's nest under my tool box!

I laid down 250lb of asphalt so, hopefully, they don't come back.

After all that, I tried getting the balancer back onto the hub adapter.
It came off with the steering rack in place, but it looks as though I need to at least loosen in to get it back on.

All I need is 1/4 inch!

In the process I found that the mechanic who upgraded my rack put all the bolts in from the bottom. Funny I though the bolts were suppose to go in from the top in case the nut falls off.

Last edited by BrianCunningham; Aug 30, 2021 at 11:52 AM.
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