Bolt under oil pump - Dominator

Barry Hutchison wrote on Sunday February 20th 2011 at 04.09hrs:

>Can anyone tell me what the bolt directly under the oil pump if you look under timing cover (ie on the outside of crankcase) it looks like it has something to do with oil pump it screws up from underneath

hope someone can help cheers Barry<

Hello Barry,

When the engine oil circulating under pressure within the various galleries has reached the big end shells and rocker shafts (later engines), it is drained onto the cam lobes, into the cam bushes; splashed (or squirted in the later engines) onto the bores and âpuddledâ through the main bearings.

Then it collects in the bottom of the crankcases. The return gears in the oil pump draw that oil up a small gallery (once it has been sieved a bit by the sump plug filter) which you can see running up toward the oil pump, on the outside of the case. That gallery has to be drilled at the works and they did it through the boss you can see, then threaded the boss and fitted the grub screw you are referring to in order to seal it.

Paul