Posted by rustred on November 12, 2014 at 18:18:39 from (74.214.152.80):
In Reply to: Re: 53 sa engine posted by rray on November 12, 2014 at 12:27:44:
sure don't see how a valve job is overkill. that tiny little engine's head is a piece of cake. without valves seating you have nothing. takes compression to run and start good. lapping is obsolete. seat width and position on valves is critical. all lapping does is make the seat wider in an already wore out seat. if the seat is as wide as the valve face you definitely need valves resurfaced along with the seats. and if seats are pounded out they have to be replaced also. you may get them to seal being stationary but when running the valve will walk around and not seal properly anyhow. the biggest culprit is the valve guides. you want it to run right but neglecting valves makes no sense to me. just pull the valves and post a pic of the valve faces and seats and I am pretty sure it will require valve grinding..
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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