350TBI 1500RPM engine knock

[C30454]

Since the trans was recently R&Rd, it's far more likely that the bolts weren't tightened properly than the possibility of a cracked flexplate, which is rare on that combination. And he won't think much of the loose TC bolts if he doesn't know that can create his noise.


Tom

 

[Andrew Barker]

Stop EVERYTHING! The torque converter bolts aren't tight. This will make noise just like a rod knock, but it will come and go under the exact circumstances you described. 10 minute fix.


Tom

I checked the bolts, they were tight enough that it was turning the engine over when I tried to tighten

 

[thinger2]

Buy the Summit or Lisle version. The welded tab on my $20 flywheel turner keeps flexing and two weeks ago it slipped and I punched myself in the forehead.

Thats good advice. This one is the "Powerbuilt" piece of crap and I ended up having re weld it for exactly the same reason. I only cracked myself in the head once!

 

[thinger2]

Since the trans was recently R&Rd, it's far more likely that the bolts weren't tightened properly than the possibility of a cracked flexplate, which is rare on that combination. And he won't think much of the loose TC bolts if he doesn't know that can create his noise.


Tom

Also good advice. I would also make sure that they put the correct bolts back into it.
I only mention this because years ago I had to put a clutch into a 1952 f600 tow truck with a 292 Merc on the side of I-5 in the snow because the guy who owned the damn thing replaced the pressure plate bolts with new ones that bottomed out before they torqued.
Wouldnt have done it except my roadrunner was hanging of the hook.
It sucked

 

[Frank Enstein]

If you need to change the flexplate put some 7" bolts in the 2 lowest bellhousing holes will keep it aligned-ish so you don't have to drop the trans or disconnect EVERYTHING.

 

[Andrew Barker]

If you need to change the flexplate put some 7" bolts in the 2 lowest bellhousing holes will keep it aligned-ish so you don't have to drop the trans or disconnect EVERYTHING.

Sounds good.