Interestingly the laygear on my early BN1 didn't have any numbers
stamped on it, but it was beautifully manufactured.
Replaced the box with a later BN1 box (the laygear broke a tooth) and
the laygear in the later box wasn't as nicely made! Probably cranking
them out faster than the production line could really handle, whereas
with the A90 it was dullsville hence the nicely made gears in the
early BN1s..
On 6/4/08, John Harper <ah@jharper.demon.co.uk> wrote:
> Alan
>
> Further comments.
>
> Your number 2/ and 3/ below were the same.
>
> I have found that some Gold Seal BMC gearboxes had the old gear set
> fitted. I believe that it was decided that the so called improved gears
> were not much better than the originals.
>
> The part number stamped on the laygear is not the same as the finished
> item part number as found in the parts list. The numbers in square
> brackets below are those stamped on the laygear
>
> DESCRIPTION OLD PART NEW PART
>
> Laygear with bushes 1B 3481 [1B 3474], 1B 3693 [1B 3694]
>
> Regards
>>
>>John is right, but it's actually more complicated than that. there
>>are 4 types of gears commonly used in BN1 boxes:
>>
>>1) Very Early BN1 used one set
>>2) All other BN1s used another set with a slightly revised helical
>>angle (this gear is in probably about 90% of the boxes out there)
>>3) A third set which was an attempt by the factory to fix weak third
>>gear and were sold as a complete set to replace gear sets in broken
>>boxes (and used in gold seal repaired boxes)
>>4) Gears stolen from A90 Atlantic boxes which was very common in
>>Australia and NZ, as they had lots of derelict A90s and a
>>disproportionate number of BN1s vs other models on the road.
>>
>>Best thing to do is to let us know the part number on the current
>>laygear then and only then can it be properly matched.
>>
>>Best,
>>
>>Alan
>>
>>On Wed, Jun 4, 2008 at 6:05 AM, John Harper <ah@jharper.demon.co.uk> wrote:
>>> Jack
>>>
>>> Just a word of caution. There are two versions of the laygear and the
>>> VIN may not be a good guide because there were conversion sets available
>>> to fit to early types.
>>
>
> --
> John Harper
>
--
Alan
'52 A90
'53 BN1
'64 BJ8
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