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How prone to cracking are the main bearing webs when removing the main cap bolts?

m1garand_man

New member
93
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0
Location
Ft Wainwright / AK
How prone to cracking are the main bearing webs when removing the main cap bolts? I have been informed by two machine shops which wont touch my 6.2 for a rebuild that this is a really common problem with the 6.2 I want to check with you guys on this before I pull the bolts to put in new bearings.
 

Flingarrows

Member
138
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16
Location
N Central Illinois
When I put a 6.2 in my M715, I tore down 2 running engines to refresh, and they had cracked mains. The 3rd was a charm... Not saying that they all are bad, just my experience
 

M37M35

Well-known member
Steel Soldiers Supporter
572
648
93
Location
East Central Oklahoma
Have you dug in to it yet? Do you know if it's cracked?

Some series blocks are more prone to cracking than others. I don't remember which offhand.
Removing and reinstalling the bolts don't cause the cracks.
If it's not cracked, rebuild it with ARP studs and a girdle. If there are cracks, they can be fixed if they're not too deep. There's an insert called Lock-n-Stitch that is supposed to be a permanent fix for these cracks.

Here's a link talking about it.
http://www.dieselplace.com/forum/63...l-engine/273304-cracked-blocks-revisited.html

http://www.thedieselpage.com and http://www.dieselplace.com are good resources, search those sites for info.
 

m1garand_man

New member
93
0
0
Location
Ft Wainwright / AK
Have you dug in to it yet? Do you know if it's cracked?

Some series blocks are more prone to cracking than others. I don't remember which offhand.
Removing and reinstalling the bolts don't cause the cracks.
If it's not cracked, rebuild it with ARP studs and a girdle. If there are cracks, they can be fixed if they're not too deep. There's an insert called Lock-n-Stitch that is supposed to be a permanent fix for these cracks.

Here's a link talking about it.
http://www.dieselplace.com/forum/63...l-engine/273304-cracked-blocks-revisited.html

http://www.thedieselpage.com and http://www.dieselplace.com are good resources, search those sites for info.
I haven't yet because I'm scared for what I will find. I really cant afford a new block right now or the down time to do anything about it. The engine was running fine before the head cracked but I know that doesn't mean anything.
 
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