Knocking nosie comin from the flywheel/starter area

[Budrun]

Geez! 77 posts later and all these posts count for nothing?

Take it to a mechanic and let him listen to it. Or take a video and post it here. It can be hard to diagnose a motor without a video or actual in-person status. Most of us here gave you suggestions and ideas from our opinions. Didn't you check them out?

Check the last page there is a video dude, I have checked and re checked everything you guys have suggested. I wouldnt ask for an opinion if there was no video. Thanks for the response.

 

[Budrun]

It sounds alot like rod or wrist pin knocking in your video...

You say it goes away as soon as you rev it and only when warmed up? Hows the oil pressure?


Try this: warm up the engine till it starts knocking, rev it to see if the knocking goes away as usual. Shut engine off, Then unplug the Number 8 spark plug, start engine again and rev it to see if the knocking still goes away like before. Repeat proceedure with Number 7 spark plug.

If unplugging any of these spark plugs changes the way the knocking sound behaves...you have a bad rod bearing or wrist pin/piston.


EDIT: after closely looking at the video, I realized that the knocking sound happens every OTHER revolution which can still be a wrist-pin (knocks during the power stroke) or stuck/collapsed lifter. I still recommend trying the method above.


Badrun's video http://s30.photobucket.com/albums/c335/Budrun/Blazer/?action=view&current=IMG_0534.mp4
compared to:

.

Thanks dude! I will get on it the next time I have a minute. Will report back with the results.