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Username Post: What Bearing size do I need?        (Topic#376267)
Joey1930 
Newbie
Posts: 22

Loc: Breda, The Netherlands
Reg: 11-08-23
01-20-25 11:48 AM - Post#2877256    

So I am rebuilding a 62 impala 235 to put in my 51 fleetline.
The crankshaft had great clearance on the mains and rod bearings and it looked great.
I still took it to the machine shop for a polish and have a thread tapped in for the harmonic balancer. The man of the machine shop (83 yo oldtimer) said I didn't need to go a bearing size larger since it was just a polish and the crankshaft was still in great condition.
Unfortunately it is hard to tell what size bearings are in there now. I can't really figure out the numbers written on the bearings. All it says is "GMMA" and various numbers.
I don't see "standard" or "0.10" stamped anywhere.
These are the sizes measured by the machine shop after the polish.

all rod bearings 2,3114173228

Main 1 2,6842519685
Main 2 2,7149606299
Main 3 2,7460629921
Main 4 2,7771653543

Hope somebody can tell me what size bearings I should go with so I can order new ones.

Thanks in advance



 


Shepherd 
Valued Contributor
Posts: 3682

Loc: Lake George, NY
Reg: 11-11-15
01-20-25 11:58 AM - Post#2877257    
    In response to Joey1930

Have you checked the bearing clearances, see if you need bearings,or do they just look bad. All your crank journal sizes are correct for stock bearings, so what is the problem?



Edited by Shepherd on 01-20-25 12:42 PM. Reason for edit: No reason given.

 
Joey1930 
Newbie
Posts: 22

Loc: Breda, The Netherlands
Reg: 11-08-23
01-20-25 02:42 PM - Post#2877264    
    In response to Shepherd

My bearings didn’t look so good anymore and number 4 was worn tappered.
But I guess I got the answer to my question if you tell me that the size is still stock.
What about the connecting rods?



 
Shepherd 
Valued Contributor
Posts: 3682

Loc: Lake George, NY
Reg: 11-11-15
01-20-25 03:58 PM - Post#2877269    
    In response to Joey1930

As you posted, all the crank journal sizes meet the shop manual specs for a standard size crank. So std size bearings would be the right ones. Didn’t your machine shop tell you this?



 
Joey1930 
Newbie
Posts: 22

Loc: Breda, The Netherlands
Reg: 11-08-23
01-21-25 04:32 AM - Post#2877279    
    In response to Shepherd

So at the machine shop they said that I could keep the same size bearing as I used because they didn’t have to grind off a lot.
But my confusion is that I couldn’t indentify the bearings that where mounted in the engine.
So I didn’t see std or 010.
But I alread Understand that they are all std

Thanks



 
RAM_51 
"8th Year" Silver Supporting Member
Posts: 6799
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
01-21-25 07:56 AM - Post#2877291    
    In response to Joey1930

Here is a webpage that might be able to help you with other 1962 235 engine particulars:

LINK:
https://www.gm.com/content/dam/company/n o_search/h...


1951 Fleetline Preservation
'51 Fleetline DeLuxe, POWERglide 2-DR (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Faded Red)
'50 Styleline DeLuxe 4-DR (Mist Green)


 


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