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Excessive valve lash

Posted: Wed May 12, 2021 7:40 am
by bobt
My friend has a true barn find 1913 touring. We got it running a while back and have done a lot of work on it. We had a stuck exhaust valve on #3 cylinder and finally got it unstuck the valve is now going up and down and the cylinder now has 40-45 pounds of pressure (all are 40-45#) we noticed that # 3 exhaust has about .064" lash where all the others have about .015. What do you think? worn cam? lifter? valve? Thanks, bobt

Re: Excessive valve lash

Posted: Wed May 12, 2021 8:22 am
by John Warren
That is excessive, the way the model t valves are adjusted in the manual will leave the valves with many different clearances. I use the more modern way and actually adjust them to a clearance. .010 to .015 is good to strive for. Sounds like you need a longer valve unless it has adjustable lifters.

Re: Excessive valve lash

Posted: Wed May 12, 2021 9:26 pm
by Allan
If a barn find car performs well on the road, I would leave it well alone. My take is you do the work such cars require to keep them in good operating condition. Safety needs to be paramount. Brakes need to be as good as you can make them, the front axle needs to be rebuilt, good tyres and wheels are needed and then just get out and enjoy the experience.

On my barn find Henrietta, it was not long before she needed new bands. Then she ran number one rod bearing and I replaced that in the car, through the bottom of the pan, to save having to disturb everything. I fixed the windscreen hand wiper so that it worked. She gets fuel and oil as needed, and a windscreen clean when I remember. She just runs better the more I use her.

Allan from down under.