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Ziggster · 10-17-2019, 04:21 PM

Spoke with my machinist today, and he mentioned there was a problem with the crankshaft bearings. Here are the particulars:

1. C69 block (supposedly 100 Hp version)
2. Standard crank (90 Hp version) with reground journals, but not sure of size.
3. Company that reground the crank supplied the bearings to match crank

The problem:

1. The crank bearings do not fit the block and main caps. The inside width between the flanges is 0.030" too narrow.
2. Appatently Ford changed the bearing/ block size for 100 Hp rated engines vs. 90 Hp rated engines.
3. They found a set of "correct" bearings in California, but by the time they get here, cost is approx CAN$600!

Has anyone had this issue, and if so, what did you do? Machinist is checking with shops to see if it is "customary" to shave the bearings to fit, but this requires building a fixture on a lathe to turn down the thickness of the flanges.

10-17-2019, 04:21 PM	#1
Ziggster Senior Member Join Date: Aug 2018 Location: Ottawa, ON Posts: 857	RTH - Crankshaft bearing sizes Spoke with my machinist today, and he mentioned there was a problem with the crankshaft bearings. Here are the particulars: 1. C69 block (supposedly 100 Hp version) 2. Standard crank (90 Hp version) with reground journals, but not sure of size. 3. Company that reground the crank supplied the bearings to match crank The problem: 1. The crank bearings do not fit the block and main caps. The inside width between the flanges is 0.030" too narrow. 2. Appatently Ford changed the bearing/ block size for 100 Hp rated engines vs. 90 Hp rated engines. 3. They found a set of "correct" bearings in California, but by the time they get here, cost is approx CAN$600! Has anyone had this issue, and if so, what did you do? Machinist is checking with shops to see if it is "customary" to shave the bearings to fit, but this requires building a fixture on a lathe to turn down the thickness of the flanges.