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Andy:
First of all you would have to find out which end of the push rod tube is leaking.
I replaced all the pushrod tube seals and it made no difference, then I found out that it was the outer end of the tube leaking on two cylinders. They are embedded in the aluminum and sometimes get loose through picking up the cylinders by the tubes. There is a tool you can rent that you rotate inside the tube and it reams a small bead around the perimeter and seals it again.
Both ends have solutions.
Alan.
N87333
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