426ci main bearings ??? D21
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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=201203
Printed Date: 30 Nov 2024 at 10:38pm
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Topic: 426ci main bearings ??? D21
Posted By: Acdiesel
Subject: 426ci main bearings ??? D21
Date Posted: 06 May 2024 at 10:46am
From what I gather this is the only way that these new main bearings are avaliable. These are .010" Old ones are wider then the new ones by 0.197" Does anyone have some insight on this? Thanks, Dan ------------- D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger) |
Replies:
Posted By: SteveM C/IL
Date Posted: 06 May 2024 at 2:58pm
| At some point they made the journal radius larger on the crank and wide brgs wont fit. If you have piston cooling from mains all the uppers are for that application. If cooling through rods you will lose some psi unless you strip crank out and drive the little steel balls in main saddle. I doubt that's what you have since it's got the wide brgs. |
Posted By: Acdiesel
Date Posted: 07 May 2024 at 10:54am
  Non- piston cooled Engine # 3D-05778 I should not have any worries using the updated bearing assemblies and following the service manual on the reassembly of the the components? Thanks, Dan ------------- D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger) |
Posted By: DrAllis
Date Posted: 07 May 2024 at 11:18am
| New bearings will work fine. Get new conn rod bolts. Be very clean assembling the rod caps with those serrations in them. Any dirt is bad. |
Posted By: SteveM C/IL
Date Posted: 07 May 2024 at 8:32pm
| I'd have to look. I think book wants slot on cam side. Yours doesn't need the slot but that's all they make. |
Posted By: Acdiesel
Date Posted: 08 May 2024 at 10:57am
|
thank you, I dont like it when manufactures change designs. ------------- D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf D15 SER.2 DIESEL,D15 ser.II nf D12 SER.I, D10 Ser.II 2-720'S Gmc,caterpillar I'm a pharmacist (farm assist) with a PHD (post hole digger) |