Sealing Early Case Bolts

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Adam Townley
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Sealing Early Case Bolts

#1 Post by Adam Townley »

I'm rebuilding an early-ish engine - a 1957 normal. How do I seal the the acorn nuts and TWO through bolts?

I've not worked on a case like this one before, with two through bolts as opposed to one, and I'm wondering how the acorn nuts and through bolts are sealed.

On the tear-down I noticed the washers are not the bevelled type, but standard flat washers. Underneath these washers was what looked like paper gasket washers covered in sealant. Out of the eight washers, one is the bevelled type that takes the 'o' ring like on the . later cases I have looked at before.

Has anyone any experience of this? What to do?

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Vic Skirmants
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Re: Sealing Early Case Bolts

#2 Post by Vic Skirmants »

Original method was a copper washer. Obviously needing replacement each time. Also soft, so did not clamp the case very well.
I would change over to the later beveled washer with O-ring.

Adam Townley
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Re: Sealing Early Case Bolts

#3 Post by Adam Townley »

Thanks Vic,

I'll switch to bevelled.

Tim Berardelli
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Re: Sealing Early Case Bolts

#4 Post by Tim Berardelli »

Adam,

If you switch to the beveled case washers with "o" rings you will need to replace the case through bolts-the bolts that use the copper washers will not allow enough thread engagement with the thicker beveled washers.

Adam Townley
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Re: Sealing Early Case Bolts

#5 Post by Adam Townley »

Ah, okay that changes things a little. Trying to keep as original as possible.

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Craig Richter
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Re: Sealing Early Case Bolts

#6 Post by Craig Richter »

I used to heat those copper washers up with a torch to get them soft again, as they harden from torque and age. Flatten with a sharp fine file and you're good to go. But Vic's suggestion to go with the later beveled washers with O-rings is the best answer.
 

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