smallfry Posted March 4, 2019 Share Posted March 4, 2019 Not too taxing for some of you guys...……….. I need to fit an alien torque converter to a flexplate. The original had a six point fixing, but the new one is only three point fixing. This in itself is not the problem as I can just use three of the six holes. However, the PCD of the holes is different by 6.5mm. Now, the obvious and easy way is to elongate the holes in the flexplate by 3.25mm each. I am not really entirely happy with this though. I don't want to be adding weld to "move" the holes, because of distortion and interfering with balance. Thought about brazing some washers to it, but don't like this for much the same reasons. Only other thing I can think of is shouldered bolts in a much larger hole, but then there is the problem of finding something suitable. Or am I worrying too much ? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 4, 2019 Share Posted March 4, 2019 Can you drill new holes? Quote Link to comment Share on other sites More sharing options...
Blanco Posted March 5, 2019 Share Posted March 5, 2019 tap three of the existing, plug with a piece of bolt, grind flush, re-centre and drill new hole? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 5, 2019 Share Posted March 5, 2019 15 hours ago, smallfry said: Or am I worrying too much ? I think you and some others are not worrying enough about securely mounting a large rotating mass on the end of your crankshaft! From my very limited experience aren't flex plates made of quite special material (EG not mild steel, I'm assuming something with some spring/flex) and hence I'd be hesitant to start welding or drilling without knowing what's what. I'm sure broken flex plates are a thing, and not a good one. Vibrations in the system, even minor imbalances, can cause serious damage. The easy solution (if someone has the machine) is mount it in a rotary divider in a mill and drill 3 new holes all properly aligned and centred. Quote Link to comment Share on other sites More sharing options...
smallfry Posted March 5, 2019 Author Share Posted March 5, 2019 Yes, the flexplate will me made of something other than plain mild steel. That's another reason that I do NOT want to weld or braze it. It doesn't really lend itself to drilling another set of holes because of the shape of it, but I guess I could do this, but again I am concerned this will affect the strength of it in some way. The converter is held in position by its center boss which locates in the rear of the crankshaft, and by its nose and gearbox input shafts. The bolts seem to only transmit the drive, and not actually support it...……. If you see what I mean I do like the idea of plugging nd redrilling the threaded mounting pads in the TC though, or maybe I could get a TC specialist to rejig the mounting pads to the correct PCD Quote Link to comment Share on other sites More sharing options...
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