knockin rod
 

Is it hard to fix this problem on a straight 6 4 liter. thanks

Lucas

Yup. You rebuild the motor...with a new rod...and re-ground crank journals...and oversize bearings.

But the good news is that if they're aren't too many miles on it, you might not need new pistons.

It's a big job no matter how you slice it.

x2


as long as it does not sound like diesel and you have good oil pressure and compression in the cylinders i would just leave i alone.

If it really is rod knock then yes it is a big, expensive job.

Are you absolutely sure it is a rod?

^^^ he's right, rod knock = rebuild.
how bad depends. you might get away with new rings and bearings, and not have to turn your crank. or your Cylinder walls could be muffed and youll need to bore, which means new pistons too....
if it was me i would drop your oil pan and inspect your rotating assembly, see if i could anything out of the ordinary..
or start looking for a engine to rebuild

It would be cheaper to find a used complete longblock or shortblock (no head) out of a junkyard than pay to have it rebuilt. Just an idea.

Check the torque converter bolts and make sure the flex plate is not cracked. Those two items will make a rod knocking kind of noise.

Amen. That is exactly what was wrong with mine. Having a real mechanic listen to it saved me a rebuild.

thanks guys.

Lucas

Ya, i had the same problem and thought it was a rod knock. It ended up being the torque conv. Bolts.

FIRST BE CERTAIN WHAT IT IS !!!

It takes a trained Ear to diagnose engine noise just by listening to it. And even then it's still a geuss !

At Idle does it have a Steady Tink tink tink.. Or Does it knock under load, or (If its a rod) It should be loudest when cruising at a steady speed when your just "Floating" The engine.
I think these motors are more prone to Main bearing noise than anything else. And like was said above it could be simply something Loose.. Noises are hard to pinpoint in a cast iron engine due to the ringing of cast !!