'39 Packard Six - seeking piston ring and spark plug data
Posted by greybeard On 2024/9/7 14:08:34
Performed a dry and wet compression test on my Six with a pronounced smoky exhaust issue at the request of my mechanic. To my knowledge, the engine is the 4 liter inline flathead six. Dry test - cylinders 1-4 read 110psi, #5 reads 105psi, and #6 reads 80psi. The wet test on 5 and 6 gave me 110psi and 90psi, respectively. I would like to acquire piston rings, but have learned from experience that not all retailers know which parts are correct for this engine. Additionally, I purchased replacement spark plugs based on what the owner's manual (I have one that looks original, came with the car, on the front cover stating "For cars beginning engine B-1501") spec'd - AC-103 or Champion Y-4. Auto Zone had a "match" for the 103's in Autolite brand, but they physically would not screw into the spark plug holes in the engine block. I discovered the plugs that are in use are Champion UY-6. Which leads me to wonder several things; why the mismatch, is the engine perhaps not the original one, and will my search for piston rings, and other items I intend to acquire for a tune-up or repair, be influenced by this mystery. The engine serial/ID number is 23870A. Who is a reputable retailer to acquire piston rings and other perhaps Packard-specific repair and tune-up items from? Any insight would be much appreciated.
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