11 replies to this topic

[english bob]

1989 998 special lhd

nearly got it all back together, thn checked the primary gear end float (why not, better late than never!!!) the gap is 0.3mm is this really bad?

how do I work out which new shim I need, haynes talks in mm and the mini centre i inches


please help

bob

[Big_Adam]

Errmm...convert?

Haynes shows both sizes. Find out what's it's ment to be, convert from metric to imperial. Done.

[Calver ST]

1.0" = 25.4mm. So to work back and forth multiply or divide using that. So - 0.3mm = 0.3 divided by 25.4 = 0.012". Yes that's bad. It should be 0.003" to 0.006" (0.003 x 25.4 = 0.076mm to 0.006 x 25.4 = 0.15mm). Often the extra large gap is caused by the front retaining 'C' clip wearing. This happens when you change gear, it bashes the primary gear up against the retaining washer which in turn whacks the C-clip. If you look at the C-clip you will see one side has grooves worn in to it. If you are lucky the other side will still be pretty flat - so just trun the C-clip around and re-measure. If it doesn't get the gap down, you will need to measure the bronze thrust washer to see what thickness it is and refer to one of the Mini specialists sites for alternative sizes. If yiou already have the largest or second to largest thrust washer, you will need to buy a new retaining C-clip and backing washer first - then re-measure and take it from there. KC

[english bob]

1.0" = 25.4mm. So to work back and forth multiply or divide using that. So - 0.3mm = 0.3 divided by 25.4 = 0.012". Yes that's bad. It should be 0.003" to 0.006" (0.003 x 25.4 = 0.076mm to 0.006 x 25.4 = 0.15mm). Often the extra large gap is caused by the front retaining 'C' clip wearing. This happens when you change gear, it bashes the primary gear up against the retaining washer which in turn whacks the C-clip. If you look at the C-clip you will see one side has grooves worn in to it. If you are lucky the other side will still be pretty flat - so just trun the C-clip around and re-measure. If it doesn't get the gap down, you will need to measure the bronze thrust washer to see what thickness it is and refer to one of the Mini specialists sites for alternative sizes. If yiou already have the largest or second to largest thrust washer, you will need to buy a new retaining C-clip and backing washer first - then re-measure and take it from there. KC

thanks, will retry the gap as you have suggested....will keep you posted

I had the thrust washer measured today it came in at 3.00mm ( strange coincidence that its0.3mm the gap!) so back on the maths that works out at 0.12"

just so I know what would too much end play manifest itself as...noise, rattle or worse?

cheeers

bob

[Guess-Works.com]

Primarily, you'd probably notice an excess of oil into the clutch housing past the primary seal, as the primary gear moves backwards and forwards depending upon load, as you carry on using the engine, the endfloat will progrssively increase and eventually....

worse...

Likelyhood that the bronze bush would ultimately disintegrate, taking the primary gear, crank, idler and gearbox with it... but that would take a while.

[english bob]

Primarily, you'd probably notice an excess of oil into the clutch housing past the primary seal, as the primary gear moves backwards and forwards depending upon load, as you carry on using the engine, the endfloat will progrssively increase and eventually....

worse...

Likelyhood that the bronze bush would ultimately disintegrate, taking the primary gear, crank, idler and gearbox with it... but that would take a while.

OUCH!!, Had better get this right then!

thanks for your previous help, we're getting there i think....just taking forever!!

cheers

bob

[english bob]

I have looked at the C washer, it only has a very faint ridge on one side (hardly noticable), I turned this and remeasured the gap, still at 0.3mm, with my thrust washer being 3.00mm the total is 3.3mm, if I subtract the allowed end float of .101 this leaves me with 3.199 which is I believe .126"

so....

is my train of thought good?

&

can I get a thrust washer in this size, if so where from (998 mini)

cheers

bob

[partsguy1]

MiniSpares has no stock, but MiniSport may have a 22A450 which is the thickest thrust washer for a 998 (.120) This combined with a C washer may get you within the spec end float.
http://www.minisport...nfo_22A450.html
Terry

[english bob]

Is This What I need


P/GEAR SHIM 998 118" 120"22A450


need to get this thing sorted, help please

cheers

bob

[Pooky]

Yeah, I think so, I'm just about to order one as I'm in exactly the same boat!

Gonna treat myself to a new C washer and backing plate as well

[english bob]

Yeah, I think so, I'm just about to order one as I'm in exactly the same boat!

Gonna treat myself to a new C washer and backing plate as well

yeah i hope so, i'm just a bit worried its not....come too far to muck it up now, if you know what i mean!!

[Spitz]

MiniSpares has no stock, but MiniSport may have a 22A450 which is the thickest thrust washer for a 998 (.120) This combined with a C washer may get you within the spec end float.
http://www.minisport...nfo_22A450.html
Terry