I know what the specification should be for the cyl. head restrictor but recent experience with a pin to spec seemed to provide too much oil such that it couldn't get away fast enough back through the front ball race and dribbled out of the front of the crank even though there is now a proper oil seal there. replacing the pin with one giving less flow seems to have stopped that leak but how can one judge "correct" oil flow? It still now flows out of all the cam follower holes though not copiously and the oil isn't splashing about much.Comments welcome. Simon J4199
Good point Peter. Hole should be 0.25 inch and the pin was ground slightly under that at 0.248 inch. If you would like me to double check your pin dimensions against an original Simon you can E mail them to me. There was some incorrect ones around a few years back.
Thanks for that,My pin is ,in fact,.24"dia and the hole in the head is tapered from about .256" to .25". I had faced off one side to .221" but this must be too much given the taper and undersize pin.Mathematically(if I am correct)a .221" section off the .25" dia = about .003", the difference in cross section area between .25" and .24" = .oo4" (I think)hence a completely round undersize pin as I have should be OK ???. Getting all a bit anorakish? Thanks any way--- Simon.
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Posted - 14/05/2008 : 18:30:01
