Re: Flaw with unfreezing stuck engine with hydraulics (Part II)

Posted by Bob M on April 23, 2002 at 15:57:37 from (66.66.72.246):

In Reply to: Flaw with unfreezing stuck engine with hydraulics (Part II) posted by Dan Kelley on April 23, 2002 at 14:38:13:

Dan - Most tractor spark plug threads are metric - not NPT. They're generally 18mm, though some later motors use 14mm plugs. Also the earliest tractors (1920's) used a 7/8" thread I think.

HOWEVER you can accomplish what you suggest by busting the guts out of an old spark plug and welding a 1/4" nipple capped with a grease fitting to the remaining plug shell. Screw this modified plug into the head. Now pump the cylinder with grease (or gear oil - easier to clean up afterward...) from a grease gun. Just be careful about bending rods, etc! 2,500 psi applied to a 4" diameter piston develops an incredible amount of force... (You also need good valves in the cylinder being pumped).

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