Mike Brichta Posted September 25, 2017 Posted September 25, 2017 Does anyone know the part number for the pilot bushing that goes into the back of the crankshaft (SBC) for a Muncie M21 Manual 4-speed? I am looking for it on Rock Auto and I don't know the dimensions of the bushing and there are several to choose from. Thanks!! Mike Quote
1970mcss Posted September 25, 2017 Posted September 25, 2017 The Chevrolet parts catalog shows the pilot bearing PN# 3752487, 19/32 ID x 19/32 OD x 3/4" Quote
Mike Brichta Posted September 25, 2017 Author Posted September 25, 2017 Great!! That should do it. Thanks!!!!!!!!!!!! Mike Quote
MCfan Posted September 25, 2017 Posted September 25, 2017 The Chevrolet parts catalog shows the pilot bearing PN# 3752487, 19/32 ID x 19/32 OD x 3/4" Hmmmm ... that must be a very thin bearing with identical ID and OD dimensions! Quote
John S Posted September 25, 2017 Posted September 25, 2017 I got this off of a Corvette forum. Someone tell me if I am wrong. There are two types of bronze bushings. Bronze only and bronze with steel alloy. The bronze one you can lubricate while the alloy one is oil impregnated. You can tell which one you have with a magnet. Forum stated do not lube the oil impregnated one it may cause bushing to seize to input shaft. John S Quote
Mr70Monte Posted September 27, 2017 Posted September 27, 2017 why use the old bronze bushing, use this instead https://www.summitracing.com/parts/ado-ct1078?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-acdelco&gclid=EAIaIQobChMI1LTHnJXE1gIVQ1mGCh1wwAvYEAQYAyABEgINavD_BwE Quote
Mike Brichta Posted September 27, 2017 Author Posted September 27, 2017 I saw that part while I was searching but didn't know if it would work or not. If the one I ordered doesn't work for some reason I will give that one a try. Thanks!! Mike Quote
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