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Bob Bidonde · 07-10-2020, 09:14 AM

I cannot imagine how the crankshaft is contacting the oil pan. Also, it something is scraping the oil pan, my guess is that it would make a horrible squeal, not a knock. I think Jim Brierley's notion that is a loose flywheel better fits a knocking sound.

My 1931 Coupe has a Model "A" oil pan fitted to a Model "B" engine, and no modifications were made to the dip tray for clearance. The clearance issue is with the larger "B" connecting rods and it occurs at the sides of the oil pan. The Model "A" oil pan must be dented to clear the rods as the Model "B" pan is.

The dip tray in the Model "B" pan is 0.13" lower like the 1931 Model "A" tray. Is the scrape mark on the side of the dip in the tray or on the bottom of the dip?

07-10-2020, 09:14 AM	#8
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,466	Re: Model b motor I cannot imagine how the crankshaft is contacting the oil pan. Also, it something is scraping the oil pan, my guess is that it would make a horrible squeal, not a knock. I think Jim Brierley's notion that is a loose flywheel better fits a knocking sound. My 1931 Coupe has a Model "A" oil pan fitted to a Model "B" engine, and no modifications were made to the dip tray for clearance. The clearance issue is with the larger "B" connecting rods and it occurs at the sides of the oil pan. The Model "A" oil pan must be dented to clear the rods as the Model "B" pan is. The dip tray in the Model "B" pan is 0.13" lower like the 1931 Model "A" tray. Is the scrape mark on the side of the dip in the tray or on the bottom of the dip? __________________ Bob Bidonde Last edited by Bob Bidonde; 07-10-2020 at 09:26 AM.