Re: Engine & Gearbox Rebuild
Posted by humanpotatohybrid On 2024/7/14 9:53:33
Ok, at least that noise is definitely not pinging. The question is, what is it...
First of all, what is your oil level? Obviously it needs to at least be above the Low mark. Remember to wipe the dipstick then pull it again as there is residual oil in the tube that can throw off the reading. One way to "diagnose" a worn oil pump is to simply fill the oil to the full mark, then add 1 quart extra. Generally, in the case of a worn pump, this will greatly improve the oil quality (i.e. eliminate aeration in the oil).
It's unlikely, but possible, that the factory oil pressure gauge is reading incorrectly. If you just turn the ignition on, but don't start the motor, does it read nothing, or does it instantly move up the scale? Next to the factory oil level sensor, which is in the valley of the engine in the rear, next to the distributor, is a spare iron plug where a second oil pressure gauge can be installed. You may want to add one. Most people mount it under the dash. FWIW, that factory gauge is showing about 50-60 PSI.
By the way, the oil pressure is designed to not get above a certain amount. So unless the engine is warm, i.e. with lowered oil pressure, revving the engine won't bump it up.
For the oil pump conversion, once people do them they often remove the engine vacuum hose and balancing valve. Can you take a decent picture showing the circled area on the firewall? It's possible you could already have one.
To me this sounds like lifter noise. Assuming that is the case, then checking the engine sound and oil pressure when the oil is 1qt overfull will likely narrow things down. Any decent old car mechanic should be able to check this for you. Remember to write down the oil pressure reading for your (our) reference. If these things don't help any, then I would think you just have a failed lifter.
Don's suggestion of you (or your mechanic) using a sounding rod is a very good one. Another possibility could be a crankshaft knock, but those tend to have a much more distinct sound. Again, any competent mechanic should be able to at least find the location of the noise.
First of all, what is your oil level? Obviously it needs to at least be above the Low mark. Remember to wipe the dipstick then pull it again as there is residual oil in the tube that can throw off the reading. One way to "diagnose" a worn oil pump is to simply fill the oil to the full mark, then add 1 quart extra. Generally, in the case of a worn pump, this will greatly improve the oil quality (i.e. eliminate aeration in the oil).
It's unlikely, but possible, that the factory oil pressure gauge is reading incorrectly. If you just turn the ignition on, but don't start the motor, does it read nothing, or does it instantly move up the scale? Next to the factory oil level sensor, which is in the valley of the engine in the rear, next to the distributor, is a spare iron plug where a second oil pressure gauge can be installed. You may want to add one. Most people mount it under the dash. FWIW, that factory gauge is showing about 50-60 PSI.
By the way, the oil pressure is designed to not get above a certain amount. So unless the engine is warm, i.e. with lowered oil pressure, revving the engine won't bump it up.
For the oil pump conversion, once people do them they often remove the engine vacuum hose and balancing valve. Can you take a decent picture showing the circled area on the firewall? It's possible you could already have one.
To me this sounds like lifter noise. Assuming that is the case, then checking the engine sound and oil pressure when the oil is 1qt overfull will likely narrow things down. Any decent old car mechanic should be able to check this for you. Remember to write down the oil pressure reading for your (our) reference. If these things don't help any, then I would think you just have a failed lifter.
Don's suggestion of you (or your mechanic) using a sounding rod is a very good one. Another possibility could be a crankshaft knock, but those tend to have a much more distinct sound. Again, any competent mechanic should be able to at least find the location of the noise.
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