Sounds like you put too much lube on the crank. I did the same thing and
took it all apart and speared all of the assembly lube just a little bit
thinner. Then it turned with ease.By the way, I don't know if you put lube
on the back of the bearings to hold them in place, but that could do it too.
Chris
On Sun, 17 Sep 1995, John Van Valkenburgh wrote:
> Hello all,
> Whilst rebuilding my '72 MGB engine (18V), I had the machine shop turn
> the crank for me. They said that they turned the main and rod surfaces
> .010" for me. They also stamped that data on the crank itself. Tonight
> I finally get around to putting things together and using a .003"
> plastigauge I verify that the rod and main bearings are tight. So far so
> good.
>
> The thrust washers are .003" over and seem to fit snugly (no slop) while
> still allowing the crank to turn.
>
> The problem is that after I installed the main bearings and caps
> (taking care to lube the bearings with assembly lube), I can not turn the
> crank! I used a 2x4 and BFH and could *bearly* get any movement from the
> crank at all. I used care when installing the caps to make sure that
> nothing was crooked. The caps are not torqued to spec, but are quite snug.
>
> The bearings are make by AE, and are marked .010 so I think they are
> OK. My question is am I correct in assuming that it is likely the
> machine shop goofed and did not turn the main surfaces?
>
> Does anybody have a spec for the diameter of a standard crank main and
> rod surface?
>
> Ideas? Suggestions? Sympathy?
>
> Many thanks,
> John Van Valkenburgh
> Raleigh, NC
>
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