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Topic: Crank pulley seal conversion ??

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Goingbush

Crank pulley seal conversion ??

Not too shy to talk

Anyone done a seal conversion, I mean a double lip TC oil seal that runs on the pulley stub, Theres just enough room for a 12mm seal . Of the 5 engines iv'e stripped the most crud to chip away is around the original spring loaded 'cork' seal rubbing on the timing chain cover. (I guess its better than the rear main seal - there isn't one.)

The way I see it modifying the front cover to accept a press in seal would be fairly straightforward. Anyone done it, I dont want to re-invent the wheel.

(Photo is as stripped, yes it needs a new chain)

Click to see original Image in a new window

Posted on: 11/5 6:18

humanpotatohybrid

Re: Crank pulley seal conversion ??

Home away from home

I haven't, but I have an NOS one if you'd like it. Do you have the crankshaft and bore diameters?

Posted on: 11/5 7:37

BDeB

Re: Crank pulley seal conversion ??

Home away from home

The original typ is a simple mechanical seal that works very well.
Care needs to be taken when installing the timing cover to make sur that the opening for the crank pulley is entered.

Posted on: 11/5 10:17

1949 Custom 8

Owen_Dyneto

Re: Crank pulley seal conversion ??

Forum Ambassador

Property installed that factory front seal is about as close to perfection as you can expect for a mechanical contrivance. It just makes absolutely no sense to consider a conversion.

Posted on: 11/5 17:33

Packard Don

Re: Crank pulley seal conversion ??

Home away from home

These were actually good seals that did their job well in properly maintained engines. Of course, for engines that have sat for decades, overheated or improperly maintained, they are likely hardened to the point that they are useless. That said, one of the reasons that this type of seal was used was because the shaft was keyed so you can never use a conventional seal with that!

Posted on: 11/5 21:16

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Don Pierson
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Goingbush

Re: Crank pulley seal conversion ??

Not too shy to talk

Quote:

Packard Don wrote:
These were actually good seals that did their job well in properly maintained engines. Of course, for engines that have sat for decades, overheated or improperly maintained, they are likely hardened to the point that they are useless. That said, one of the reasons that this type of seal was used was because the shaft was keyed so you can never use a conventional seal with that!

You never use a seal on the crankshaft itself, they are all keyed in every type of engine, the seal runs on the pulley.

Posted on: 11/6 0:09

BDeB

Re: Crank pulley seal conversion ??

Home away from home

Quote:

Goingbush wrote:
Quote:

Packard Don wrote:
These were actually good seals that did their job well in properly maintained engines. Of course, for engines that have sat for decades, overheated or improperly maintained, they are likely hardened to the point that they are useless. That said, one of the reasons that this type of seal was used was because the shaft was keyed so you can never use a conventional seal with that!

You never use a seal on the crankshaft itself, they are all keyed in every type of engine, the seal runs on the pulley.

Wrong, the seal does not run on the pulley, it seals against the timing gear cover.Again, to repeat, it is a simple mechanical seal that is functionally the same as very sophisticated mechanical seals used on high pressure centrifugal pumps.

Posted on: 11/6 0:14

1949 Custom 8

Goingbush

Re: Crank pulley seal conversion ??

Not too shy to talk

Quote:

BDeB wrote:
Quote:

Goingbush wrote:
Quote:

Packard Don wrote:
These were actually good seals that did their job well in properly maintained engines. Of course, for engines that have sat for decades, overheated or improperly maintained, they are likely hardened to the point that they are useless. That said, one of the reasons that this type of seal was used was because the shaft was keyed so you can never use a conventional seal with that!

You never use a seal on the crankshaft itself, they are all keyed in every type of engine, the seal runs on the pulley.

Wrong, the seal does not run on the pulley, it seals against the timing gear cover.Again, to repeat, it is a simple mechanical seal that is functionally the same as very sophisticated mechanical seals used on high pressure centrifugal pumps.

I and I believe Packard Don are both talking about a conventional seal here. they run on the pulley

Posted on: 11/6 0:20

BDeB

Re: Crank pulley seal conversion ??

Home away from home

Quote:

Goingbush wrote:
Quote:

BDeB wrote:
Quote:

Goingbush wrote:
Quote:

Packard Don wrote:
These were actually good seals that did their job well in properly maintained engines. Of course, for engines that have sat for decades, overheated or improperly maintained, they are likely hardened to the point that they are useless. That said, one of the reasons that this type of seal was used was because the shaft was keyed so you can never use a conventional seal with that!

You never use a seal on the crankshaft itself, they are all keyed in every type of engine, the seal runs on the pulley.

Wrong, the seal does not run on the pulley, it seals against the timing gear cover.Again, to repeat, it is a simple mechanical seal that is functionally the same as very sophisticated mechanical seals used on high pressure centrifugal pumps.

I and I believe Packard Don are both talking about a conventional seal here. they run on the pulley

Once again .wrong . The crank pulley is keyed to the nose of the crankshaft and extends inside the timing cover to butt up against the crank timing gear and retain the metal housing for the seal . The original type seal does not touch the crank pulley surface but rides against the inside of the timing gear cover with a thin film of oil between the circular seal face and the timing cover.
As stated by others, the original type seal works very well.

Posted on: 11/6 1:01

1949 Custom 8