NORTON SINGLE'S INTERFERENCE FIT SMALL END BUSH

WE HAVE SUPPLIED THESE BUSHES FOR MANY YEARS BUT THEY WERE NOT 100% SATISFACTORY SO WE HAVE RETOOLED, REWORKED AND CAREFULLY REMEASURED.  WHAT WE FOUND WHEN MEASURING IS THAT MANY SMALL ENDS ON THE CONROD WERE OVAL.  WHAT WE FOUND WHEN CHECKING THE ORIGINAL FACTORY INFORMATION IS THAT THEY SHOULD BE AN INTERFERENCE FIT IN THE CONROD.  WITH AN INTERFERENCE FIT IT IS IMPOSSIBLE TO CALCULATE THE INTERNAL DIAMETER REQUIRED AS THE BUSH CLOSES UP BY A PERCENTAGE OF THE INTERFERENCE, OF COURSE THE INTERFERENCE FIT WILL VARY GREATLY FROM ROD TO ROD AND THE OVALITY IN THE ROD DOES NOT HELP.

SO,

WE HAVE COME UP WITH TWO DESIGNS OF THE SAME BUSH, THE ONLY DIFFERENCES BEING THE INNER AND OUTSIDE DIAMETERS.  THIS BUSH (E4102) IS THE TIGHT INTERFERENCE FIT BUSH WHICH WILL NEED TO BE PRESSED INTO THE SMALL END EYE AND THEN DIAMOND BORED TO SUIT THE PIN.  FOR THE FREE FIT BUSH SEE PART NUMBER E4102F.

GUIDE SIZE FOR FINISHED BORE: .8752" - .8747"
THE BUSH IS 1.145" (29MM) LONG WITH A 1 1/32" (26.15MM) OUTSIDE DIAMETER (NOMINAL) WITH A .870" BORE TO ALLOW FOR MACHINING. 

BOTH BUSHES ARE CNC MACHINED IN THE UK AND HAVE TWO IDENTICAL OIL GROOVES EXITING FROM EACH END ON A 1" PITCH TRANSPOSED 180 DEGREES APART.  THE HOLES IN THE TOP SHOULD BE CAREFULLY DRILLED AFTER FITTING.  PLEASE SEE E4102F FOR THE PRE SIZED EASIER TO FIT BUSH.  (FOR IN SITU REPAIR).