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  #11  
Old 27th April 2018
barefoot barefoot is offline
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Quote:
Originally Posted by doodah man View Post
Oh, I meant the plunger in the door that contacts the bottom of the shift cam.
We could start a pool, everybody put five bucks on their favorite failed part.

Then the Doc would come in, snag all the money, and run back to his cave laughing all the way
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  #12  
Old 27th April 2018
paulc paulc is offline
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Quote:
Originally Posted by barefoot View Post
We could start a pool, everybody put five bucks on their favorite failed part.

Then the Doc would come in, snag all the money, and run back to his cave laughing all the way
Hopefully five bucks is all it will cost in parts
Yoshi is coming over Saturday morning and the trans will be pulled then so there is 24 hours more betting time left.
Paul
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  #13  
Old 27th April 2018
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ezmerf ezmerf is offline
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Well I'll stick with my story.The high pitch whining the metal on his fingers looks like gear material I say it wasn't setup right.
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  #14  
Old 28th April 2018
barefoot barefoot is offline
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Quote:
Originally Posted by ezmerf View Post
... the metal on his fingers looks like gear material I say it wasn't setup right.
Most likely from the dogs bouncing off each other at speed, when it wasn't shifting. It could have been set up perfect but some little part broke, trashing the shifting, which leads to ... Now you could say the mechanic should have magged every part to eliminate any old junk from breaking, but if we could predict the future Parnelli woulda won Indy.
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  #15  
Old 28th April 2018
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mct496 mct496 is offline
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Default That would be a good idea

Quote:
Originally Posted by ezmerf View Post
Would it not be best to check his end play on main and counter shafts before he pulls trans since the indy missed the torque?
Id check out the doc's shifter blueprinting thread in the meantime and if you can get your hands on some big twin top hats nows the time to upgrade and a hardned camplate would be nice too
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  #16  
Old 28th April 2018
paulc paulc is offline
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yoshi came over today and here is a summary of our morning:

With the clutch loaded we tried to check mainshaft endplay but the shaft wouldn't turn or move at all so the dial registered nothing.
We couldn't check countershaft endplay as the plug on the end wouldn't come out.

Next we undid the trapdoor bolts and took out the trans:

We measured clearances and they were as follows:

C/S 2nd-3rd 33-35thou
C/S 3rd-1st 33-35thou
M/S 2nd-3rd 52thou
M/S 2nd-4th 58thou







Mainshaft looks bad here but in fact when cleaned up everything looked good except 2 things - M/S thrust washer and shifter fork shaft.

The M/S thrust washer was 85thou thick. EDIT: a bit scored but NO heat marks as I said at first.



Slight scuffs on gear but nothing of note. Gears, shafts and tower parts all looked fine so no pics taken.

Pin that stops thrust washer rotating doesn't look wonderful:



Mainshaft trapdoor bearing has some movement:

https://www.youtube.com/watch?v=zQ171fzedgI

The shifter fork shaft wasn't a tight fit in the trapdoor:

https://www.youtube.com/watch?v=bOr-slCC49s

Also at the case end of the shaft there was a black bung which seemed held in place with silicon of some kind:



My other engine has a metal plug there which I presume is 16285-48; Plug, shifter shaft. It is metal and looks like this from the outside:



This engine however just had the black plug, nothing that would stop the shifter fork shaft, that isn't tight in the trapdoor, from moving left to right. The shaft has some scoring, this pic was taken as I pushed it back and fore through the case:





Some burrs around the trapdoor hole it sits in. Think this is the right pic but not entirely sure :



Trans was reassmbled and the 85thou M/S thrust washer was temporarily, to see what would happen with endplay, replaced with a 60thou one. Trapdoor bolted back in and then we found:

M/S endplay 15-16thou
C/S endplay (plug was out now) also 15-16thou

That's where we stopped. went and to the pub for a pint of Doombar, well earned yoshi mate, many thanks:



I learnt a lot today and now will ponder things for a while before deciding where to go next. Thoughts gentleman please.
Paul

Last edited by paulc; 28th April 2018 at 22:15.. Reason: Edit
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  #17  
Old 28th April 2018
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The thrust washer with the heat marks wasn’t your one Paul, it was one from the box of stuff I brought with me.
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  #18  
Old 28th April 2018
paulc paulc is offline
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Woops, thanks yoshi, I'll edit my post accordingly
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  #19  
Old 29th April 2018
paulc paulc is offline
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Any thoughts anyone on what yoshi & I found yesterday?
Paul

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  #20  
Old 29th April 2018
deguireb deguireb is offline
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Hi Paul, Sorry to hear about this problem, I have my transmission out now and collecting parts for the C ratio update. Having second thought now though. I am also a rookie so hopefully you get some guidance from others with experience soon. I'll be monitoring this thread closely, thanks for documenting it so well. Regards, Bryan
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