Bottom end noise

[SteveStang]

Rebuilt a 200 a few years ago with my father in law and have driven the car very little.
had some noise but disregarded but twice now have been told by mechanics there is a noise in the bottom end.
Runs pretty good.,good oil pressure etc.
The last mechanic says that the cam may not have been broken in properly.Did not know there was a break in procedure

steveStang

 

[CobraSix]

There is a break in procedure for non-roller cams (which the 200 has). I've never heard of it resulting in bottom end noise however. The procedure is to basically run the cam in at 2000 RPM for 5 minutes (which is fun to do on a rebuilt engine when you are just trying to get it started). After the break in, you change the oil and filter (mostly to make sure there is no assembly lube in the oil).

Can you describe the noise?

 

[SteveStang]

Thank you
I did replace the stock cam with one from ford six performance
would this still apply

 

[rbohm]

8) the proper break in procedure for flat tappet cams is to run the engine at 2000-2500 rpm for 20 minutes. do not let the engine idle during this period, if there is an issue, shut the engine down and fix the problem, then restart the engine. the nice thing is that break in time is cumulative, so if the engine ran for 5 minutes, you still have 15 minutes to go.

as for your bottom end noise, its possible that a connecting rod is hitting the oil pan. you can use an automotive style stethoscope to locate the noise. sometimes a wiped cam lobe will cause a noise, but it usually also causes rough running.

 

[SteveStang]

Thanks
I have run it like that so I am not sure but I would say that since it was put back together,It has always run a little rough.
Thanks for the reply

 

[rbohm]

Thanks
I have run it like that so I am not sure but I would say that since it was put back together,It has always run a little rough.
Thanks for the reply

a little rough doesnt indicate a wiped cam lobe. its more like the engine is dropping a cylinder every rotation rough.

 

[SteveStang]

thanks
it was definately drivable.A guy I know has narrowed it to a timing gear where only 1 was replaced and should be done in pairs.He says he is almost 100% that that is the problem by using his stethoscope.He is going to install a new kit for me.Hope he is right

Thanks for your reply
Steve

 

[CobraSix]

Would be interesting. Never heard of that, but then again I've never not replaced a timing set as a pair.

BTW, con rod hitting the pan is very easy to do. Had that happen as well on my cam break in.

 

[SteveStang]

thanks for your reply
i replaced the whole thing as a set when it was rebuilt so i am not sure.I purchased the set from Classic Inlines as well.Hope i dont go through all of this and the noise is still there

SteveStang