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aermotor · 05-19-2019, 07:35 AM

Be very cautious using these. I can only speak for my own engine and one other. The counterbore in the block is too deep for the sealing washer and the diameter is not large enough for the steel washer. I realized something was wrong when I couldn't quite "click" nearing the 100 # torque. The flat steel washer was contacting a portion of the block that was not counter bored and bending the steel washer. I don't understand the reasoning to change something that worked for 80 + years when the originals are available and I doubt the grade 8's are any stronger than used originals. This puts a bending load on the bolt and won't allow the "sealing" washer to seal, which it doesn't need to anyway.

John

05-19-2019, 07:35 AM	#19
aermotor Senior Member Join Date: Mar 2015 Location: Greenville, SC Posts: 1,099	Re: Main bearing bolts Be very cautious using these. I can only speak for my own engine and one other. The counterbore in the block is too deep for the sealing washer and the diameter is not large enough for the steel washer. I realized something was wrong when I couldn't quite "click" nearing the 100 # torque. The flat steel washer was contacting a portion of the block that was not counter bored and bending the steel washer. I don't understand the reasoning to change something that worked for 80 + years when the originals are available and I doubt the grade 8's are any stronger than used originals. This puts a bending load on the bolt and won't allow the "sealing" washer to seal, which it doesn't need to anyway. John Last edited by aermotor; 05-19-2019 at 07:43 AM.