[Healeys] Camshaft differences

[Chris Dimmock]

Andy. 
There are 2 gear drives on a camshaft.  
One for the distributor. 
One for the oil pump. 
The drive for the distributor was always the same number of teeth. 
Always on a C series engine. Same same same. 
Oil pump? That's different. 
Same size gear for both?
No. Smaller? That's early
Bigger gear for oil pump? 
That's later. Bigger gear. 
That's the one I'll be using. 
Your pic tells me nothing. 
All c series engines have identical distributor drive gears. 
Don't try to identify anything by 50 year old ridges or grooves. 
Or do. Your call. 

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>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> 
> Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
> 
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/austin.healey@gmail.com
>