Re: Strange 327 Knock

Posted by PackardV8 On 2011/7/13 15:51:32

I'll second that. Measure it with a mic. Measure at two locations,each at rite angles to each other for out of roundness. And measure at each each extreme end of the journal for taper.

Even if u don;t do anything about any out of roundness u will at least know what u got and what u don't have. Sometimes knowing what is and what isn't in an engine is more important for making later judgement calls than for any fine tuning that can be done now.

If after all of this work the knock persists or comes back in after 4K miles or so then u'll be able to determine if it's due to any questionable or non-questionable journal issues. OR determine that it is not due to any journal issues.

BTW, while the pan is off check the torque on all of the main bearing caps and other rod caps. Inspect anything else, even just visualy, that is easy to see while pan is off. Look at each piston for split skirts, especialy the pistons near the front where the knock is.

I have the pan and head off of an engine rite now. I just spent more time laying under the truck inspecting and cleaning than i did on disassembly. About 3 hours worth.