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The Ford 9N Engine Rebuild Chronicle
by Bill Dakin
Part One (Continued): Tearing Down the Engine
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A check of the oil pan shows some sludge, but a frequent
oil change will keep it to a minimum.
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Remove the two valve covers and inspect the valves
and chamber. The #4 exhaust valve train and chamber is heavly coated
with sludge and carbon. Remove the valve train with a valve spring
compressor, pry the assembly down, then remove the retaining ring.
This process is by far the most aggravating step in the engine overhaul
process. Years of sludge and moisture make the valve train very stubborn
to removal. Penetrating oil and persistance usually release them.
The machine shop can do it for you, but there is no fun in that.
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The crankshaft pully, timing gear cover, and governor
bracket are removed.
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The oil pump and pickup tube. The oil pump
overhaul should be done or sent with the other parts to the machine shop
for renewing. Often the tube will be loose where connected to the
body. This MUST be resecured to prevent air from being sucked into
the pump and loss of prime.
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The block will be stripped of all components for
the chemical cleaning bath. Some machine shops have an oven to bake
out the sludge, but in this project, the shop will use the chemical bath.
The cylinder head studs shown will be replaced with grade 8 cylinder head
bolts. This will allow the head to be pulled in the future without
removing the hood and gas tank.
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Crankshaft is removed and inspected. The machine
shop will check the journals for wear and condition. Grinding is
usually necessary to remove scoring and to provide for new babbit bearings
with a clearance of 0.001" to 0.0015".
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Part One (Continued): Tearing Down the Engine
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