Roller Bearing Conversion Modification to Ariel KG/KH 500.

First of all I need a donor Bottom to experiment with. for this purpose I have accuried the following parts with great help from Mike Robson. 

The Crank needs a little further investigation weather it is suatable or not, as the surface for the connecting rids looks abit modified. and might have been too modified to my tast:

The Left side Half of the case looks like NOS, and will not be modified at all. Ath Rigt side will be modified to accomodate to the new bearing: The Bearing that is going to be fitted is the INA.NKIB 5906 (C3) bearing which is a Normal roller bearing as well as a thrust bearing. This means that no shimming is required as it also is hold in place in the axis direction, This is the specifications:

Dimensions (metric)	d	30
	F	35
	D	47
	B	23
	B1	25
Approx. Wgt. lbs		.340
Interchange	FAG	DNJB 5906
	INA	NKIB 5906
	SKF (Eur.)	NKIB 5906
	SKF (EUR. Old No.)	NAXB 5906

As can be seen from the drawing above, the Crank case will have to worked to give room for the Outer diameter of 47 mm, where the normal Diameter of the bearing to be placed in the case is 41,25 mm, so the hole in the crank will have to increase its diamter with about 5,75 mm. This leaves sufficient material to be left in place, and it must be remembered that the Bearing is made of steel, so alot of strength is maintained there.

The Crank will be re-groung to a Diameter of 30 mm, where it originally is about 31,8 mm. No problem here either.

I have made CAD drawing of the Setup only involving the replacement Bearing for the moment, but it will be revised to show the Oild feed as well, when I find a Timing cover so I can measyre the Space available:

Rev 1.00.01:

Download the CAD file containing the complete drawing: rev_1.00.01.cad, If you want to view it, you can use the free cadstd software, used to draf this file. Its simple, Nice and completely free..http://www.cadstd.com

Rev 1.00.02: 

Now included the Original Design as well for comparison:

Or download the CAd file direcly here: rev_1.00.02.cad,

The big question is getting the oil pressure into the crank, but I have a couple of suggestions to how this can be done. Natually it will have to gi in through the end of the crank, but for Authentic reasons I will NOT settle for a solution that will require me to drill holes in the outer timing cover.

More to come soon. But It will be possible to make this modification. If you have any thoughts on this or any suggestions Please drop me a line.

I am a member of the "Danish Ariel Club" (www.arielklubben.dk), and "Ariel  Owners MC Club", Back to start page HOME - Get your Ariel things here www.draganfly.co.uk. 

Email me at - kimfmx@gmail.com