MECHANIC JOE
ANSWERS OWNERS' PROBLEMS
Non-Standard Valve Tappet Clearances
Q. —I run an 8 h.p. Morris and the makers give the valve clearance at O.OlOin. If this clearance were set to 0.009 what effect would it have on the performance of the engine? Would it give me increased "E.J.M."
power?—'
A.-. —The engine is so designed that it is necessary for a tappet clearance of 0.019 in. to be allowed, to obtain the most satisfactory results. If an owner attempts to close the clearance to 0.009 in. he will find that the timing will be affected, and also that there would be a tendency for the valves and valve seatings to be burnt. You would be well recommended to adhere to the approved clearances.' Q. —I am troubled with piston pin knocking. Is the remedy to have
A.—The pin trouble will not be remedied by installing new pistons alone. You must also have new pins and new rings. Also have the cylinders carefully checked for wear. If out of round or tapered, they need a rebore.
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Bibliographic details
Bay of Plenty Times, Volume LXX, Issue 13622, 21 April 1942, Page 3
Word Count
176MECHANIC JOE Bay of Plenty Times, Volume LXX, Issue 13622, 21 April 1942, Page 3
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