After a long, on and off, restoration (not the motor) I finally got the '74 on the road. Took a few test drives to the gas station, working out minor glitches and within 10 miles, I hear a knocking sound, like a rod knock but less consistent. Maybe broken rocker. I drained the oil and found a few tiny chunks of metal and the rest had a thin paper consistency. I believe it's the bearing material. Anyone?
Thanks for any input (before I pull the engine out.
Old school:
Puling the plug wires one at a time was a way to find the rod knock. When the knock stops with a plug wire pulled you found the bad rod.
My knock turned out to be the cam thrust bearing. Knocked on cruise and idle. Then under load the knocking stoped
Mine too had long strips of babbit bearing material in the screen.
I think I'd be a little nervous about pulling plug wires that I may cause more damage. The knocking noise was pretty hard to ignore. It knocks anytime the engine was running.
I pulled off one valve cover and all pushrods seem ok. I think, I need to keep going on removing the engine. I restored the whole car, might as well do the motor too.
Thanks for the reply.
At this point it doesn’t really matter what it is.
Time for an engine teardown to assess and repair. It will not get better with time and more mileage.
"Garry glitter" is a new one for me. Sounds like a Vegas Elvis imposter.
Pulling (or shorting, this is easier) plug wires will not hurt an engine in any way, doesn't have to be bad already.
The only thing it might hurt is YOU if you're holding that wire when you pull it off.
I'll normally pull the boots on the distributor cap back and just use a test light to ground each tower. Works fine and no SPARKY.
Cylinder shorting is a common diagnostics procedure that has been around forever.
Don't try to do this with COP setup. Those can have enough ZAP to stop your heart.
Still will not hurt the engine however...
I am in agreement with the others.
It's done, time for teardown.
No need to shock yourself unnecessarily...
Metal in the oil is never a good thing and does it matter which cylinder it is?
Hate to say it but it's teardown time
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