Should I Line Bore?

Posted by Jeff_MI on January 08, 2003 at 19:08:55 from (12.2.88.51):

My BN has busted #1 and #2 main bearing caps due to water in the engine over the years. The crank surfaces are smooth and round, and the block side of the main bearings look fine. I ordered new (used) bearing caps and am asking your advice on my options regarding line boring the shaft bearings. Here are two options I can think of:

1. Have a machinist line bore it (minimum $150 for the line bore alone). What exactly do they do, and what do they look for when considering boring?

2. Torque the caps and (new) bearings, and mic each bearing. Then, feel the bearing surfaces for any discontinuities between bearing halves. Lastly, put in the crankshaft and see if it turns easily using 50W oil. My concern with this method is the possibility of it turning okay at slow speed, but binding up at rated speed (is this possible?).

Thank you for your help.

Follow Ups:

• Re: Should I Line Bore? Shovelman 05:59:53 01/09/03 (0)
• Re: Should I Line Bore? bill b va 03:13:50 01/09/03 (0)
• Re: Should I Line Bore? randy hall 20:00:37 01/08/03 (0)
• Re: Should I Line Bore? ronald polk 19:34:48 01/08/03 (0)

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