QUICK CRANKSHAFT QUESTIONS ???
26 February 2009, 10:01 AM
#1
QUICK CRANKSHAFT QUESTIONS ???
This is probably one for API David 
...
I know it's considered obviously a BIIIG NO-NO to regrind a Subaru crank... But what's involved in polishing one (that is obviously still okay to be reused in a rebuild)?...
Is it just that: i.e. a general clean-up and gentle polish on a lathe or something, WITHOUT actually removing the journals' (important hardened) surface metal [as you would with a regrind]?
Cheers
...I know it's considered obviously a BIIIG NO-NO to regrind a Subaru crank... But what's involved in polishing one (that is obviously still okay to be reused in a rebuild)?...
Is it just that: i.e. a general clean-up and gentle polish on a lathe or something, WITHOUT actually removing the journals' (important hardened) surface metal [as you would with a regrind]?
Cheers
Last edited by joz8968; 26 February 2009 at 03:48 PM.
26 February 2009, 05:34 PM
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Joz, if you seal up the oil galleries with RTV sealer Then you can polish away. Clean it all up, then remove the RTV plugs and you should be OK to clean again all through the galleries.
Emery cloth or whatever, uses carborundum as the cleaning, polishing medium and if you get any in the galleries, there is always the risk of the hard particles doing damage.
Part of the problem with grinding a crank is the residue of worn out bearing material being in the galleries and the other part is the carborundum dust that is created when grinding the crank getting in there too.
There is little point in the RTV trick on a crank with a failed bearing, as there particles are already in there.
Good Luck David APi
Emery cloth or whatever, uses carborundum as the cleaning, polishing medium and if you get any in the galleries, there is always the risk of the hard particles doing damage.
Part of the problem with grinding a crank is the residue of worn out bearing material being in the galleries and the other part is the carborundum dust that is created when grinding the crank getting in there too.
There is little point in the RTV trick on a crank with a failed bearing, as there particles are already in there.
Good Luck David APi
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