Knock/rattle from flywheel area

[jux]

I'm getting a rhythmic knocking sound that seems to be coming from the flywheel area of my '86 c10 350 3 on the tree. I don't know how long it has been going on, I don't hear it over my exhaust unless I'm under the truck.

When I assembled everything around april/june, I used locktight and torqued everything to specs. I don't have time today to check the flywheel for cracks, but other than that, what else could it be?

Does anyone else have or had a tap or knock coming from that area?

Thanks

 

[MrMarty51]

Cracked flex plate or the T-convertor nuts is coming loose.
If starter is doing weird things, it could be the starter drive is`nt retracting.

 

[Jims86]

Three on the tree is a manual trans. But yeah, cracked flexplate or Tq coverter bolts. If you do have the 3 speed Saginaw trans, Have someone press the clutch slightly to see if the noise dissapears. if it does, your throwout bearing may be toast. And at that point, just do a clutch job.

 

[jux]

Maybe I'm going crazy, but when I was trying to do what Jim suggested, I could no longer hear the noise at all.

I was hearing it this morning after I changed my oil and happened to go back under the truck while it was running. Then I tried to listen to the sound tonight, but when I got under the truck I couldn't hear it again.

 

[zieg85]

Sounds to me a throw out bearing starting to go

 

[jux]

I'll keep listening. Possibly related, but when taking off in 1st, I have been getting clutch chatter that shakes the truck.

 

[Jims86]

I'll keep listening. Possibly related, but when taking off in 1st, I have been getting clutch chatter that shakes the truck.

Tell the clutch to shut the **** up, and get back to work.

 

[austinado16]

Have a friend step on the clutch pedal with the engine running, while you watch to see if the crank pulley is being shoved forward. If you see the pulley move outward, and then back inward when the clutch is released, you know you've got way too much crankshaft end play, and the crank is knocking back and forth.

 

[jux]

Tell the clutch to shut the **** up, and get back to work.

It did just that, thanks for the tip.

Seriously, the chatter went away, hopefully for good. Will post if it re-occurs.

Austinado: I will try this when I get a chance, thanks.