Greetings, fellow stovebolters! I am very new to working with engines, in fact, this is my first one.
I find myself facing a puzzling issue with my beloved 1954 Chevrolet 235ci straight 6 stovebolt engine, and I'm seeking the wisdom and expertise of this esteemed forum. When I push the pedal to the metal, I'm met with troublesome sputtering and misfires that just won't quit. On top of this, a 50 mile journey will use about a quart of engine oil. I've already taken several steps to address the problem, including carburetor balancing, replacing a bent pushrod (located on cylinder 3), and fine-tuning the tappets. However, my efforts have yet to yield the desired results. Furthermore, I'm getting a top speed of 45mph on the flat (which im happy with) but if it sees any hill it drops significantly, down to about 20mph.
In my quest for answers, I conducted a compression test last night, and the results left me scratching my head: Cylinder 1 showed a meager 65psi, Cylinder 2 recorded 75psi, Cylinder 3 revealed a worrisome 25psi, while Cylinders 4, 5, and 6 displayed a more promising 75psi each.
Tonight, I am going to push compressed air through the spark plug holes to see where the air comes out of, I've seen that this can help identify the issue?
(air out the carb = intake valve, air out the exhaust = exhaust valve, air out the breather = piston leak? )
Upon inspecting the spark plugs, I discovered that they were all dirty but dry, as I had anticipated. However, Cylinder 3 stood out with its dirty and wet plug, indicating a potential anomaly.
Adding to the puzzle, I couldn't help but notice an intriguing phenomenon with the pushrods. While the pushrods on most cylinders exhibited a ticking motion as they spun, Cylinder 3's pushrod spun freely and continuously, setting it apart from the rest.
I turn to this esteemed community in the hopes that your collective knowledge and experience will shed light on these perplexing symptoms. Your insights and guidance are greatly appreciated as I strive to revive the full potential of my cherished classic engine.
Thank you in advance for your invaluable assistance and expertise.
Is it worth a full engine rebuild? And is this something I could potentially do myself and learn how to do it? or would it have to go to a specialist shop?
If anyone is interested, I have put a video of the engine tickin over on the youtube link below. Edit by Moderator: Removed imbedded video and provided link.[LINK]