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For reference, this is the seal:

Front Crankshaft Seal against Timing Cover

Thanks for the explanation guys, that makes sense. I assumed it had something to do with a seal. Any chance that a modern seal could be used? Would that negate the need for perfect centering?

-Kevin

This is a face seal, that runs over the face of the timing chain cover. What I think is the issue with alignment is if the inner edge of the face seal intersects with the hole in the cover, then bad things can happen to the seal.

I don't know if the "wiggle-room" that exists because of the slop in the holes for the attaching screws is large enough that it could also effect things like the clearance for the timing chain.

From what I can gather, the Small-Block-Chevy uses a regular shaft seal that is embedded into the timing case cover, and then runs on a shaft, which may be part of the harmonic balancer, I am not sure. Anyhow, the situation is different. One could do that, but it would require a significant modification to the cover and a seal race on the harmonic balancer.

My other construction zone this winter is to get the Convertible top working.
The control valve came back from HydroElectric.
Looks great, hope it works as well as it looks.
I'll take some pics and measurements for Darryl who was asking about one little part of the valve.

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Mike, is that copper plate like affair part of the switch or part of the hydraulics or does it have some other function?

The push pull knob rotates the bottom of the valve (bakelite part with the copper ring) the Ring then makes contact to that copper Pole coming down from the terminal with the screw and 2 nuts.
At the end of travel for push pull, there is continuity to energize the solenoid on the pump motor.
I just checked with a multi Meter!

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Thanks for the info on the switch. Guess dust, crud and position has always kept the copper hidden on those valves I have seen in car. Was a bit surprised to see bright copper out in the open. Must be the way it mounts the ring is protected well enough nothing could touch the copper and short to anything.

Getting back to the seal on the Timing cover. If I can find a section of pvc pipe or plastic that has 49mm outside diameter and 34mm inside diameter, I should be able to make a home made arbor....

Blessed be thy friends and colleagues that have a lathe!
This fits perfectly on the crank nose and in the timing cover. After I put everything together, I could share/lend this to the common cause in case anybody else is doing the same job in the future. My project feels like it moves like a glacier, slowly but surely.

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I took a detour from engine work to put in the Convertible top valve. When installing, First attach the Hydraulic lines, then attach the switch to the Firewall. That makes it much easier to screw in the 4 Hydraulic lines.
The wiring was also in terrible condition, so I was very pleased to replace that. The wiring to the circuit breaker, switch and solenoid is a small stand alone harness, so it was easy to replicate.

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