Construction and other equipment - HD6B #789 rod bearing

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HD6B #789 rod bearing

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=190125
Printed Date: 27 Nov 2024 at 4:49pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD6B #789 rod bearing

Posted By: IronWarrior
Subject: HD6B #789 rod bearing
Date Posted: 17 Aug 2022 at 6:26am

can someone tell me what the diameter of the rod journal on a 344 buda should be?

I'm trying to determine if the crank has been turned and if so to what extent.

Replies:

Posted By: gemdozer
Date Posted: 17 Aug 2022 at 7:13am

The rod bearing is 2.7715/2.7725 but am't a expert

Posted By: IronWarrior
Date Posted: 17 Aug 2022 at 7:21am

Thank You.

Posted By: IronWarrior
Date Posted: 17 Aug 2022 at 1:47pm

why are there two different values?

Posted By: gemdozer
Date Posted: 17 Aug 2022 at 5:05pm

I found these number in FEDERAL-MOGUL and you could check with your NAPA dealer

Posted By: Adrian
Date Posted: 17 Aug 2022 at 8:51pm

The manual says main bearing 3.498 to 3.499 and connecting rod 2.7715 to 2.7725. Mains can be ground to .010, .020, .030, .040 below 3.499 and below 2.7725 for the connecting rods. I hope this helps.

Posted By: IronWarrior
Date Posted: 17 Aug 2022 at 11:57pm

Yes it does help. thanks. i just put the mic on my rod journal it comes out to 2.757

Posted By: Adrian
Date Posted: 18 Aug 2022 at 2:16am

Glad I could help. It's worth getting a service manual as they are pretty comprehensive.