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Ol' Ron · 03-28-2024, 10:20 AM

I used floating bearings in all my race engines back in the 60's. I used an old flywheel re ground as the surface I used to tap the bearing in place. you need a bearing mike which has a ball on the anvil side fo measuring the thickness'.
To start with, measure the ID of the rod with the cam torques in place. The 21A rod measures 2.220
Crank measures 1,998 and the bearing thickness is .108
now I'm doing all from memory so they maybe wrong, I put a small amt of oil on the old flywheel place the two bearing halfd to gether and measure roundness place the bearing on the fltwhell to spred the bearing and on edge to decrease the size I use a smal ight hammer to accomplish this
This is is a putzing job, do enough of them. and it gets easier.
whit I look for is .002" On both the rod and the crank, total of .004 plus alittle
I also like .012/.015" clearance between the rods to allow for ore oil flow. keeps the bearing cooler
Lastle I save allltthe old bearings from the junk engines so I have a supply of different thickness bearings
It's fun to relive this. Take care
Gramp
PS all engines come with a surface plate. us it.

03-28-2024, 10:20 AM	#14
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,881	Re: Tap rod bearings into shape?? I used floating bearings in all my race engines back in the 60's. I used an old flywheel re ground as the surface I used to tap the bearing in place. you need a bearing mike which has a ball on the anvil side fo measuring the thickness'. To start with, measure the ID of the rod with the cam torques in place. The 21A rod measures 2.220 Crank measures 1,998 and the bearing thickness is .108 now I'm doing all from memory so they maybe wrong, I put a small amt of oil on the old flywheel place the two bearing halfd to gether and measure roundness place the bearing on the fltwhell to spred the bearing and on edge to decrease the size I use a smal ight hammer to accomplish this This is is a putzing job, do enough of them. and it gets easier. whit I look for is .002" On both the rod and the crank, total of .004 plus alittle I also like .012/.015" clearance between the rods to allow for ore oil flow. keeps the bearing cooler Lastle I save allltthe old bearings from the junk engines so I have a supply of different thickness bearings It's fun to relive this. Take care Gramp PS all engines come with a surface plate. us it.