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Old 06-06-2021, 09:20 PM   #1
daveymc29
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Default Front crankshaft modern seal

Helping a friend stop a leak at the front of his pan. We removed the pan with new seals and gaskets in hand. Examining the new modern front seal I find it has no markings on it and the lip of the seal, the part that actually does the sealing of the crank pulley, is slightly offset. That is depending on which way one installs it the seal can be a tad over an 1/8 inch forward or backward of its position if you installed it facing the opposite direction. I believe he got it from Snyder's and we found no directive on which way it is supposed to face. Or perhaps it makes no difference, it appears both sides of the lip are pitched at the same angle. The difference would appear to me to be how far fore or aft one prefers to have the sealing take place on the pulley. Any advice, thought or speculation on this?

Thanks in advance. We plan to ask Snyder's tomorrow, but want a second opinion also.
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Old 06-06-2021, 09:33 PM   #2
alexiskai
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Default Re: Front crankshaft modern seal

Snyder's instructions say:
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Install with lip towards rear of engine. Rubbing surface must be smooth and not worn. Original shaft diameter is 1.625 inches. Deburr crank pulley before assembly. Bed the OD of the seal in silicone gasket sealant.
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Old 06-06-2021, 09:40 PM   #3
Terry Burtz, Calif
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Default Re: Front crankshaft modern seal

Peel the seal lip back to see the garter spring.

The garter spring side of the seal should be internal to the engine.
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Old 06-07-2021, 07:33 PM   #4
CWPASADENA
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Default Re: Front crankshaft modern seal

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Be sure the rubbing surface on the crank pulley is absolutely smooth. I chuck the pulley in the lathe and polish this surface. this way, the machining marks will not wear out the lip of the seal. Also, lubricate the lip of the seal before you install the crank pulley.

This is what I do,

Chris W.
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