series gearbox technical question

A

Andy

Guest

• Oct 6, 2004

• #1

whey hey, look at me getting all technical......

ive stripped my series 3 suffix D gearbox and the mainshaft bearing
that came off was stamped with 4 circles, i take it this is to denote
the bearing is manufactured to extremely tight tolerances,

the new bearing which is a brit part has C3 stamped on. which i take
it would relate to 3 circles.

so am i putting an inferior bearing back in, should i get a C4 bearing
or doesnt it matter.

hope someone can help me before tommorow as i cant wait to re-build it
and stick it in to see if it works ok.

knowing my luck the transfere box will be buggerd.

TIA

andy

 

E

EMB

Guest

• Oct 6, 2004

• #2

Andy wrote:
> whey hey, look at me getting all technical......
>
> ive stripped my series 3 suffix D gearbox and the mainshaft bearing
> that came off was stamped with 4 circles, i take it this is to denote
> the bearing is manufactured to extremely tight tolerances,
>
> the new bearing which is a brit part has C3 stamped on. which i take
> it would relate to 3 circles.
>
> so am i putting an inferior bearing back in, should i get a C4 bearing
> or doesnt it matter.

C3 is the amount of clearance inside the bearing - C3 is "more than
standard" and is normal for gearbox bearings.



--
EMB
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A

Andy

Guest

• Oct 6, 2004

• #3

On Thu, 07 Oct 2004 09:29:57 +1300, EMB <[email protected]> wrote:

>Andy wrote:
>> whey hey, look at me getting all technical......
>>
>> ive stripped my series 3 suffix D gearbox and the mainshaft bearing
>> that came off was stamped with 4 circles, i take it this is to denote
>> the bearing is manufactured to extremely tight tolerances,
>>
>> the new bearing which is a brit part has C3 stamped on. which i take
>> it would relate to 3 circles.
>>
>> so am i putting an inferior bearing back in, should i get a C4 bearing
>> or doesnt it matter.
>
>C3 is the amount of clearance inside the bearing - C3 is "more than
>standard" and is normal for gearbox bearings.

but my question was, the one i took out was c4 ( four circles stamped
on it ) and the replacement is c3,

will this be a problem?

andy

 

E

EMB

Guest

• Oct 6, 2004

• #4

Andy wrote:
> On Thu, 07 Oct 2004 09:29:57 +1300, EMB <[email protected]> wrote:

>>C3 is the amount of clearance inside the bearing - C3 is "more than
>>standard" and is normal for gearbox bearings.
>
>
> but my question was, the one i took out was c4 ( four circles stamped
> on it ) and the replacement is c3,
>
> will this be a problem?

Shouldn't be - I generally use C3 bearings in gearboxes.

--
EMB
change two to the number to reply

 

A

Andy

Guest

• Oct 7, 2004

• #5

On Thu, 07 Oct 2004 11:11:07 +1300, EMB <[email protected]> wrote:

>Andy wrote:
>> On Thu, 07 Oct 2004 09:29:57 +1300, EMB <[email protected]> wrote:
>
>>>C3 is the amount of clearance inside the bearing - C3 is "more than
>>>standard" and is normal for gearbox bearings.
>>
>>
>> but my question was, the one i took out was c4 ( four circles stamped
>> on it ) and the replacement is c3,
>>
>> will this be a problem?
>
>Shouldn't be - I generally use C3 bearings in gearboxes.

last question for now,

the 3rd 4th synchro has slotted teeth on the inside, these teeth go
a;ll the way to one end and stop about 1/4/of an inch or less at the
other, which way does it go on the shaft,?

cheers

andy

 

A

Alex

Guest

• Oct 7, 2004

• #6

On Thu, 07 Oct 2004 07:19:58 +0100, Andy <[email protected]> wrote:

>On Thu, 07 Oct 2004 11:11:07 +1300, EMB <[email protected]> wrote:
>
>>Andy wrote:
>>> On Thu, 07 Oct 2004 09:29:57 +1300, EMB <[email protected]> wrote:
>>
>>>>C3 is the amount of clearance inside the bearing - C3 is "more than
>>>>standard" and is normal for gearbox bearings.
>>>
>>>
>>> but my question was, the one i took out was c4 ( four circles stamped
>>> on it ) and the replacement is c3,
>>>
>>> will this be a problem?
>>
>>Shouldn't be - I generally use C3 bearings in gearboxes.
>
>last question for now,
>
>the 3rd 4th synchro has slotted teeth on the inside, these teeth go
>a;ll the way to one end and stop about 1/4/of an inch or less at the
>other, which way does it go on the shaft,?
>

The end with the recessed splines goes towards the 3rd gear. This end
also has thicker teeth on the outside than the other end.

Alex