[Healeys] Camshaft differences

[Chris Dimmock]

Hi Andy,
Is the gear end at one end of the cam bigger than the gear end somewhere west of that?
Same question. Asked a different way. 
Are the 2 gears on the camshaft of different diameters?
3rd way are they the same diameter??
Same gears? Or is one bigger than the other?

Sent from my iPhone

> On 8 Feb 2016, at 6:21 PM, Andy Thorp <bce257 at yahoo.co.nz> wrote:
> 
> Hi Guys,
> 
> A while ago I read that there is a difference in early and later engines in that the cam has 13 vs 12 teeth on the gear that drives the oil pump. This supposedly coincided with the change from a lobe type to a gear type oil pump.
> 
> I have a mid 57 BN4, a late 57 Austin A105 sedan, an BJ8 engine and a Wolseley 6/110 Mk1 cam which are all interchangeable. The only obvious difference is that there are different ridges or grooves in the shaft between #5 cylinder lobes. The BN4/sedan engines have one ridge, 3000 engine has two ridges, 6/110 engine has three grooves, yet all of them have 12 teeth on the oil pump drive gear. Both the BN4 and sedan engines have a lobe type pump whereas the later engines have gear pumps. I have met one person who got caught by the different number of teeth on the gear when swapping a cam so the change must have been earlier on.
> 
> Can anyone decode the ridges on the cam?
> 
> Andy.
> <DSC00888.JPG>
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