Load Knocking Like Bent Rod, But Not

[duke16]

What makes the same sound as a broken/bend connecting rod? My motor all of a sudden started knocking really loudly. I pulled the engine, dropped pan and yet everything looks fine.

Thanks

 

[duke16]

Additional question.

Is it bad to manually keep turning the crankcraft after the oil has been drained and pan has been removed?

 

[Spdrcer34]

Turning it by hand is okay. There is still oil in the bearings. Running an engine with no oil is VERY bad though...

Ryan

 

[duke16]

When I turn the crankshaft, it feels like it becomes loose as a certain point, but after that it's fine. What could that be?

 

[Turdle]

Connecting rod bearing, or, possibly a piston pin has worn.

try to figure out which cylinder is at TDC when you feel the slack.

 

[duke16]

A couple of rods have a *tiny* bit of play in them, but I don't see how that would have caused all the racket I was hearing when whatever it was went, went.

Plus it was sudden, like something just broke.... I would have thought if a bearing had worn down I would have had a knocking that would have gotten louder and louder, but before whatever it was went... everything was fine. Is that correct assessment? Or would a bad bearing be a sudden thing?

 

[Turdle]

Did you remove the valve covers to check the rockers--push rods?

 

[duke16]

Did you remove the valve covers to check the rockers--push rods?

Nah, that's this weekends job.

 

[Turdle]

Nah, that's this weekends job.

Well, if a push rod was to jump out of the rocker socket, it would be sudden, and, make a heck of a racket. The sound would emanate from the center of the block due to the lifter flinging around in there-

The " tiny play" in the rod bearings has me a bit concerned---

just a thought.

I have a funny story about a backfire and pushrod coming off if you'd care to hear it-

 

[duke16]

I have a funny story about a backfire and pushrod coming off if you'd care to hear it-

Hah, sure.

Well I found the culprit, nice crack in my crankshaft.