pschlosser
Well-Known Member
it's NOT that hard to remove and restake the butterfly valve retaining screws on the throttle shaft. but it can be a little spooky your first time. bear in mind, these retaining screws are customarily made of brass, and softer than steel. you'll want to source brass replacements. we have specs if you need them. removal requires some delicate grinding of the old screws to remove the mushroomed material at the end allowing the screws to be turned and removed without harm to the threads or shaft. on assembly, getting the screws tightened with the butterfly valves correctly positioned requires patience and some careful alignment so they make a good seal.
one method of staking the screws is after assembling the valves and installing new screws, to close the butterfly valves, so the heads point downward and the ends point upward into the throttle bore. invert the assembly (top-side up) and place the closed valve and shaft on top a jig supporting the shaft on either side of the screws, to prevent the shaft from bending, then to stake the screws through the top of the assembly, through the throttle bores, and gently hammering the ends of the screws at the bottom of the throttle bores with an appropriate tool, such as a narrow chisel or long punch with a chisel point. when hammering the screws and applying force onto the shafts, it is essential to provide adequate support to the shaft so it doesn't bend. this is possibly the most difficult part for the do-it-yourselfer. if you can work through the issue, you will have little consequences to this method. if the shafts do get bent, it may be possible to bend them back by applying force to the shaft from the bottom end.
As always, should you or any member of your IM Force be caught or killed, the Secretary will disavow any knowledge of your actions. good luck, Jim. this message will self destruct in 5 seconds....
