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Discussion Starter · #1 ·
Recently picked up a set of T120 crankcases and I'm a bit confused about the hole in the gearbox where the selector ffork shaft fits. The hole goes right through the case, but on my 71 model, the hole is blind.
My question is, do I need a bush or something in this hole or does the shaft just go straight into it? Will it leak oil, or is it meant to?
 

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Discussion Starter · #2 ·
Recently picked up a set of T120 crankcases and I'm a bit confused about the hole in the gearbox where the selector ffork shaft fits. The hole goes right through the case, but on my 71 model, the hole is blind.
My question is, do I need a bush or something in this hole or does the shaft just go straight into it? Will it leak oil, or is it meant to?
sorry, forgot to mention that the cases with the hole are 1968
 

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as I remember the selector shaft hole goes all the way through on pre units and early units, but 68 is not an early motor.
maybe you have a 68 left side case and a 63/64 right side case?
That would be a good place for a gear oil leak, huh..
 

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Discussion Starter · #6 ·
as I remember the selector shaft hole goes all the way through on pre units and early units, but 68 is not an early motor.
maybe you have a 68 left side case and a 63/64 right side case?
That would be a good place for a gear oil leak, huh..
Thanks for that.Your comment caused me to have another look at the moter, and the casting marks--4533 & 4534--are I think earlier than '68, but the serial number--DU 71694 should be '68 I think. Maybe it's late 67 or early 68, but at least the cases match.
The shaft sits in there pretty tightly, but I wonder if maybe I should locktite it or something to stop oil seeping through?
 

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the 68 cases are sometimes easy to spot even without a serial number. the early 68's had no timing hole in the middle under the carbs, instead they had a timing hole way down under the front of the motor near the oil pressure relief valve, then in mid year 68 they had both timing holes, then in later 68 they went back to the single timing pin hole in the center under the carbs.
but I usually coat the open ended shaft holes with 3Bond or Yamabond and they don't leak.
 

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Discussion Starter · #8 ·
the 68 cases are sometimes easy to spot even without a serial number. the early 68's had no timing hole in the middle under the carbs, instead they had a timing hole way down under the front of the motor near the oil pressure relief valve, then in mid year 68 they had both timing holes, then in later 68 they went back to the single timing pin hole in the center under the carbs.
but I usually coat the open ended shaft holes with 3Bond or Yamabond and they don't leak.
Mine have the one hole up behind the inlet cam, which with the numbers DU71694 should make it late '68 Guess I'll just ignore that shaft hole and put a sealer on the shaft.
Another thing is my threads don't look to be Unified-I was expecting them to be because I thought they went over to that in "68, but my 12 point nuts wont fit the cylinder studs and clutch cover screws dont fit either. So I'm guessing that they're BSW. Maybe the threads changed later in the run.
The casting numbers--E4533 & E4534 look to be from 64-ish?? But I have an oil feed dowel.
I'm planning to put a 71 barrell and head on it-do you know of any problems I might come across?

I'm looking at putting a 71 barrell
 

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that is a late 68 but the 68's were all BSW thread, they started changing over to SAE in mid 69 but didn't really get all there until 1970.
I can't think of any reason the 71 650 barrel wouldn't work, the head bolts are 3/8 26TPI and never changed to SAE threads
 
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