as it was stuck to the magnet on my sump plug

Do the ends look square and straight - or as if broken ?

Looks sorta like part of a spring washer ???

Also what sort of diff output shafts do you have ?
( If Hardy Spicer there are little "collet" things that go on the output shaft.... they have a similar shape and sit in a groove - kinda matches the marks in the first picture)

My 5c worth

its a broken part of a whole part

both sides are worn, but it would have had a crossing at diagonals pattern on it.

It's a 5 cent piece....




(someone had to say it..)

_________________
GP

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

http://www.reflectionsindigital.com/RID/Mini/Mini.html

This should be in the mystery part games thread

I hope the rest of the part isn't trying to hold something expensive together...

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Could it be a washer from under a valve spring?
Sometimes engine builders will fit a washer under the spring to increase seat tension. They are sometimes serrated like that.

how would it get onto my sump plug though

yeah i changed my mind about what blew in my gearbox because i didnt get any bits of teeth or gear come out, just this piece and some small fragments and shavings of metal.

Down the pushrod hole and then down the drain between the lifters? (I know it is unlikely but it is all I could think of!)

Is is serrated or is it just marked like that?

Pete

it has a cross hatch pattern

My bet is it's a spring washer. Only internal place these are found (I think) is on the rocker studs..... everything else had locktabs. Unless someone used spring washers instead.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

how does this explain my loss of 2nd gear

OK then if it's a remote change or magic wand box yes there were shakeproof lock washers under the 1-2 and 3-4 selector screws. But not that type.. they are wrong.
Did you lose 1st gear as well?

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

runs fine, 1st 3rd and 4th are as normal
boosts fine

2nd gear knocks and shakes but you can still get drive through it

the pictured piece was the only bit worth mentioning to come out of the oil

You have partly stripped it- either 2nd gear, cluster or both. Usual story.... with too much torque.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.