OldIHC

Let me start by saying that my D-3 is running, and running pretty well.  However, I have noticed when I start her up, and even after she is warmed up, I hear a sputter out of the exhaust pipe fairly regularly.  I am suspecting the spark plugs.  They, along with the wires look like they have been in the motor for upwards of the last 25 years.  It has definitely been a looooong time since they were removed and replaced.

My question is, I imagine these babies are going to be an absolute nightmare to remove.  I plan on first starting with a can of compressed air to blow the dirt away from the plugs first.  I assume next I would get some PB or WD-40 and spray them good and let them sit prob 8-12 hours or a bit longer.  And then ever so carefully remove them

So a couple of questions….

1. Does this sound like a good plan of action?

2. For a 1940 D-3, what size spark plug is used these days?

3. Really dumb question…but I am assuming the head on this is not aluminum.  Is it iron?

Thanks for all the help!

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Sounds like a good plan of attack.  Yes, the head is cast iron, not aluminum.

Dean

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