Crankshaft wobble

["Slack Alice" Simon]

Talking of the Big Seven - I have again located the website that quotes the differences between the Big Seven and the Eight engines-

http://www.austin-eight.com/austin8history.htm

"But it is a fast, yet often quoted, misconception, that the Austin Eight adopted the Big Seven engine. As has been explained in these columns the latter’s engine is markedly different yet a step forward from the Seven in the modernization process. Without repeating what has been said before, the Austin 8 has a different crankshaft and connecting rods, the entire lubrication system from sump pan to pump is different and the detailing of the valve gear has also been altered as has the manifolding, cooling and even the components for mounting the unit.
That said, the Eight does have a 900 cc (56.77 x 89 mm) side valve engine (the Big Seven’s stroke is 0.1 mm shorter because of a smaller diameter for the big end journals)."

Regarding mounting of Angular Contact bearings on the Austin Seven crankshaft front I add the following- having in mind the flexible Austin Seven two bearing crankshaft- 

Cheers, Tony.

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Talking of the Big Seven - I have again located the website that quotes the differences between the Big Seven and the Eight engines-

http://www.austin-eight.com/austin8history.htm

"But it is a fast, yet often quoted, misconception, that the Austin Eight adopted the Big Seven engine. As has been explained in these columns the latter’s engine is markedly different yet a step forward from the Seven in the modernization process. Without repeating what has been said before, the Austin 8 has a different crankshaft and connecting rods, the entire lubrication system from sump pan to pump is different and the detailing of the valve gear has also been altered as has the manifolding, cooling and even the components for mounting the unit.
That said, the Eight does have a 900 cc (56.77 x 89 mm) side valve engine (the Big Seven’s stroke is 0.1 mm shorter because of a smaller diameter for the big end journals)."

Regarding mounting of Angular Contact bearings on the Austin Seven crankshaft front I add the following- having in mind the flexible Austin Seven two bearing crankshaft- 

Cheers, Tony.

Thanks for that, Tony.

That explains the comment in the Companion about the bearings in the "wrong" way round acting like a self aligning bearing.
Given that the crank bends and the housing is a bit worn and the 'case is acknowledged to be not particularly stiff - the "wrong" way round would seem to be better.
Two things:   I don't go for speed/revs.   I want durability.
                     If fitted the "wrong" way round, the preload shim goes between the middle rings.

This engine was nice and quiet when starting off, got progessively more rattly when warmed up.   Maybe this was because there was no pre-load on the front mains, they got slacker and noisier when warm?

Simon