[MR2] MkI ttransmissions, 5th gear

[Marc Medina]

You're seeing that odd wear pattern becuase the shaft bearing is worn and the shaft is moving around as thrust is applied. This is what I was talking about in my earlier response. You can swap out the 5th gear parts, and in another 20K miles or so, you'll have the problem again because you're fixing the symptom instead of the cause.
   
  The general way to tell a C50 from a C52 is that the C52 has two ears for the starter, the C50 only has one. Also, be aware that the meatl plate between the engine and trans is different too, so make sure you get the matching one if you buy a C52. You could also order a new one from Aaron.
   
  Marc

Kurt Krueger <telek2 at att.net> wrote:
  
-------------- Original message ----------------------
From: "Benn" 
>
> The link below suggests that the wear is on the gear and slider hub, not the
> bearing alluded to in an earlier post. Any other insights into which or
> both are more to blame? I'd find it hard to believe a worn bearing with
> slight play is gonna be responsible--I'd think the gears are the story here,
> but dunno for certain.
> Benn
> Oakland CA

I was going down the path of 'TrackQueen' as Donald pointed out. I've
got the ring/slider gear and associated parts off. There is quite a bit
of wear on the teeth, there is almost a 30 degree bevel in the last
mm or so. The fork seems OK. I'm assuming that the other gear will
have similar wear. But you really can't see it until you've cleaned
the gears. The ring gear looked just fine when I first removed it.
Out of the parts washer, the problem was obvious. The wear is
significant enough that I have doubts that replacing half of the
gear set (a la TrackQueen) will solve the problem.

Aaron has confirmed that C50 and C52 5th gears are the same. But
the total cost is in excess of $300. Used trannies are going for
around $100.

I'm still in a quandary on how to identify the C52 transmission.
If I buy a used one, I sure don't want to be stuck with a C50.
The tranny that's available now is out of an 87, is that a guarantee
that it's the C52?

BTW, the car has 150k miles, just about right for 5th gear to go.
Bought in January of '86, so it's an early one. I'm pretty sure
it's a vehicle originally destined for the US. In that year there
actually was a shortage and some dealers were bringing cars over
from Guam to sell in the US.



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