engine knock question
 

Just curious, at what clearances do rod and main bearings start to knock?

Re: engine knock question
 

I've seen [heard] them knock at .003" on other engines. These model A engines seem to be able to handle a little more before they get noisy.

Re: engine knock question
 

Depends on oil viscosity, too. And oil temperature.

Re: engine knock question
 

They put up a pretty good knock when the Babbitt in a rod decides to fall to the bottom of the pan in little bitty pieces.

Re: engine knock question
 

RE; 29 Business Coupe -my engine was rebuilt before I bought the project , when I finally got it together and running it had a knock, determined it sounded like it was # 2 cylinder. I pulled the pan rolled the engine over and was able to see the rod was tight against the piston Boss , just had to pull that piston and had the boss machined for clearance , good as new now. might not be your problem , just sharing my results

Re: engine knock question
 

most likely this means the rod is bent, and that the piston is cocked in the cylinder

Re: engine knock question
 

Hi Kurt,
What would cause tods to bend?
Regards
Chris
Cape Town

Re: engine knock question
 

Dave I don't have a problem with my engine, just curious for future reference.

Re: engine knock question
 

I've heard tell uf a "ROD BENDIN' GREMLIN"!--Sum times, he fills one cylinder clean full uf WATER & WHAMO!
Bill W.

Re: engine knock question
 

Probably dog Pee:eek:

Re: engine knock question
 

Rod NOT Bent , machinist inspected , aftermarket piston problem