Kubota Diesel Engine Main Bearing Assemblies
Kubota Diesel Engine Main Bearing Assemblies
(OP)
Folks,
I've never seen the style of main bearing cap assemblies that Kubota uses. It's clear that they end up with a very stiff block. Below is a photo album of the bottom end plus some snippets from the engine service manual showing the assemblies. I'm interested in the tolerance of the assembly fit to the engine block. The bolt coming up from the bottom cinches each assembly to the block. The manual says that each bearing cap assembly is of a slightly different diameter requiring that they be placed on the crankshaft in proper order. Is there a name for this style of main bearing assembly? The engine runs fine; this is just for information. Thanks!
Google photo album.
Thanks
I've never seen the style of main bearing cap assemblies that Kubota uses. It's clear that they end up with a very stiff block. Below is a photo album of the bottom end plus some snippets from the engine service manual showing the assemblies. I'm interested in the tolerance of the assembly fit to the engine block. The bolt coming up from the bottom cinches each assembly to the block. The manual says that each bearing cap assembly is of a slightly different diameter requiring that they be placed on the crankshaft in proper order. Is there a name for this style of main bearing assembly? The engine runs fine; this is just for information. Thanks!
Google photo album.
Thanks





RE: Kubota Diesel Engine Main Bearing Assemblies
Given that engine's construction, there exists the possibility that the bearing carriers' outside diameters are stepped for the same reason; axial assembly of the crank + bearings into the crankcase.
Mike Halloran
Pembroke Pines, FL, USA
RE: Kubota Diesel Engine Main Bearing Assemblies
The WO Bentley-designed pre-war Lagonda V12 used that construction, as did the post-war Aston-Martins and several other engines. The aluminium bearing disc assemblies were colloquially known as "cheeses" since they look about the size and proportions of a cheese disk. The Offy engines used it too.
PJGD
RE: Kubota Diesel Engine Main Bearing Assemblies
Best,
David
RE: Kubota Diesel Engine Main Bearing Assemblies