Good info!
Thanks, Steve!
I really appreciate your thorough, evidence-based study and unbiased reporting. In aviation, as in life, facts work better than opinoin. Thanks!
In mentally preparing for when it is my turn to do this operation, perhaps greasing the strike surface of the crankshaft before applying any sealant, and then applying sealant just to the exterior cylindrical surface of the seal proir pushing the seal into its bore will prevent this type of seal failure.
Tricky operation. Need clean surfaces to allow bonding. Need enough sealant/adhesive to seal/retain the elastomeric seal. Need lubricant between shaft and seal. Grease in wrong place prevents bonding. Excess sealant squeezes out intrnally and drips onto the crankshaft, bonding lip to crank.
Accept my apologies, if indeed that is exactly what you did. You obviously are a thoughtful guy.
Suspect that very fine crocus cloth "cleaning/polishing" of the crankshaft strike surface may enhance seal life. Seal experts tell us that a seal needs to leak a small amount to lubricate the lip/shaft sliding surface for long life. Too smooth a surface doesnt allow any oil to lubricate the seal lip. ... but I deferr to experts.
I still hold Pliobond in high regard for this particular application. No experience with DC-737. Probably should get a tube to see what it does on test coupons.
Please post detail pix when able. ... thousand words...
Thanks for the great post!
No pictures because I forgot my camera but yes, I had not one but two locations where pliobond was on the shaft under the seal. I'm convinced that was the cause of the seal wear. I don't know how to be more careful with that stuff so the next time around I will use DC 737.
Thanks, Steve!
I really appreciate your thorough, evidence-based study and unbiased reporting. In aviation, as in life, facts work better than opinoin. Thanks!
In mentally preparing for when it is my turn to do this operation, perhaps greasing the strike surface of the crankshaft before applying any sealant, and then applying sealant just to the exterior cylindrical surface of the seal proir pushing the seal into its bore will prevent this type of seal failure.
Tricky operation. Need clean surfaces to allow bonding. Need enough sealant/adhesive to seal/retain the elastomeric seal. Need lubricant between shaft and seal. Grease in wrong place prevents bonding. Excess sealant squeezes out intrnally and drips onto the crankshaft, bonding lip to crank.
Accept my apologies, if indeed that is exactly what you did. You obviously are a thoughtful guy.
Suspect that very fine crocus cloth "cleaning/polishing" of the crankshaft strike surface may enhance seal life. Seal experts tell us that a seal needs to leak a small amount to lubricate the lip/shaft sliding surface for long life. Too smooth a surface doesnt allow any oil to lubricate the seal lip. ... but I deferr to experts.
I still hold Pliobond in high regard for this particular application. No experience with DC-737. Probably should get a tube to see what it does on test coupons.
Please post detail pix when able. ... thousand words...
Thanks for the great post!