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Diagnoisis engine noise
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Posted by agpilot on May 01, 2007 at 13:37:30 from (206.146.78.170):
Diagnosis of Engine noise: I am searching for information that will help determine what is making noise in a Farmall 4 cylinder gas engine. I would assume most of the mid 1950's engines would be similar but to be specific I'll ask about the 169 or 175 cu engine,
If any of you haven't used a listening tube, you should try it. Sorta like a Doctors steth-o-scope. Most hardware stores have the clear plastic hose in various diameter. (I like using the half inch O.D.) Two bucks gets 4 foot of it. Cut the ends off square so that you can place one end flush against any flat surface and the other end close to your best ear. Using an ear plug on the other ear helps focus your ability to listen to just the sound coming through the tube and into your best ear. Having it FLUSH to the engine surface will help seal out unwanted noise from the many other parts of a running engine. This isolation effect of using a tube is all important to your focus on only the sound of a broken-damaged internal part.
OK... with this tube method in mind, I'd like some comments from those who have had to repair engines that have had a knocking sound from the upper engine block. Take a worn piston wrist pin as an example. What happens to that sound when the engine is put under slight load just above idle? What changes that sound when removing the spark plug to that cylinder? Get the idea. I am looking for comments to indicate what TYPE of a knock is related to the the piston or rod. I'll assume the oil pan and lower engine block is quieter. Yes, I know sound can and does display tricky symptoms but this is just to help reduce wild-eyed guessing and come up with a list of likely sounds to listen for with the various 4 cylinder engine problems. The head and related valve train is another list of sounds to check for.
Thanks for any well tried tips from those who have had to fix those unwanted noises coming from pistons or rods. Thanks.. agpilot
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