Farm Equipment - 301 rod bolts

Print Page | Close Window

301 rod bolts

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=176389
Printed Date: 03 Sep 2025 at 10:22am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 301 rod bolts

Posted By: Carl(NWWI)
Subject: 301 rod bolts
Date Posted: 30 Nov 2020 at 11:37pm

Question on the rod bolts. Mid to later style are the 12 point head bolts. The early serrated caps with the hole chamfer use the hex head bolts. Reliance notes read do not use later style bolts with early rods. Well, I definitely used 12 point bolts with early rods on my latest 190xtD build. And before that when it was a pulling tractor. Rebuilding my 301 gas now and wondering what’s correct or not. Don’t want to see a rod window my freshly line bored block.

Can I use the 12 point bolts? Not sure if the hex bolts are available. How could that slight chamfer in the bolt holes affect anything? Hex bolts use a washer, and the 12 point is a shouldered bolt.

Thanks for any input, Carl

Replies:

Posted By: DrAllis
Date Posted: 01 Dec 2020 at 7:22am

Place a new bolt in a rod cap hole. As long as it seats fully, I think you're fine. I've read that paper before and just used the new bolts anyway.

Posted By: Kevin in WA
Date Posted: 01 Dec 2020 at 8:06am

Well, I did the same years ago, put the 12 point bolts in the older rods, a 190 that is still running fine, but I had a 301 in a 545 wheel loader window a block too, ever since I always rework the rod cap like the instructions say, I have never had a problem since. Its one of them weird things, when you set the 12 point bolt in the older cap it fits perfectly, but they want the seat area to be narrower to prevent loosening.

Posted By: Carl(NWWI)
Date Posted: 01 Dec 2020 at 12:39pm

So, do you torque them to 45 or 50 then? Seems odd to me that a grade 12 bolt would be torqued less then an 8

Posted By: SteveM C/IL
Date Posted: 01 Dec 2020 at 12:58pm

Old school Carl! Go by feel! That feels tight! LOL

Posted By: Carl(NWWI)
Date Posted: 01 Dec 2020 at 9:56pm

Lol! Ram er tight with the impact!

Posted By: Kevin in WA
Date Posted: 02 Dec 2020 at 11:24am

45 ft lbs with engine oil on the threads and under the head of the bolt.