340 TECH needed

txracer · Nov 20, 2010

Well a long story cut short. My 340 quit running! Seamed to be locked up. Had towed home. Crank will turn 360 degrees then stops ( more of a thump a than a clank!) . Took starter out, then took valve covers off to check for a dropped valve, then unbolted torque converter, then pulled distributor, then oil pump shaft, then pulled fuel pump! And dang! It still will turn 360 degrees then stops cold! won't go past that spot.

Any ideas!

txracer

wannadrag · Nov 20, 2010

Pull the pan?

txracer · Nov 20, 2010

thought so

:icon_rambo:

Coronet 500 · Nov 20, 2010

Sounds like one piston stopping at the cylinder head.My spun rod bearing felt like a small clunk,clunk with small back and forth at the crank,kinnda like a loose timing chain feels like.

txracer · Nov 20, 2010

thanks

thanks for the quick responses.
all so pulled all the belts to eliminate anything on the front of the motor.

Cranky · Nov 20, 2010

Did it make any noises just before it quit running? Oil pressure drop?

74sundance · Nov 20, 2010

Pull the plugs and stick a straw or piece of stiff rubber hose down each spark plug hole then crank the motor over and watch to see if all the straws/Hoses move if one or more don't move get ready to yank that motor.

txracer · Nov 20, 2010

dart

I pulled all the plugs and felt the tops of all the pistons. I put my magnet down in all the cylinders to see if anything came out. Nothing.

I have not checked to see if all the pistons are moving with the straw trick yet. good advise.

cranky. Didn't notice any oil pressure drop. But I was not paying attention to the gauge either! I was just cruizing along at probably 35 mph with my 9 year old daughter going to the Spring car show last Saturday night. And just locked up. No noises at all.

Cranky · Nov 21, 2010

Doesn't sound good. Magnet in the cylinder will pick up pieces of an intake valve but usually the exhaust valve has a stainless steel head and the piston is aluminum. If you pull the pan and see nothing wrong, I'll be surprised....

74sundance · Nov 21, 2010

Cranky said:
Doesn't sound good. Magnet in the cylinder will pick up pieces of an intake valve but usually the exhaust valve has a stainless steel head and the piston is aluminum. If you pull the pan and see nothing wrong, I'll be surprised....

I'm with Cranky,sorry.Sounds like a busted rod is getting hung up on the crank when you turn it over.

69 Runner · Nov 21, 2010

Either that, or a rod stretched and a piston is hitting the head

Bruce · Nov 21, 2010

Pull the heads sounds like there is something in one of the cylinders hitting between the piston and the head.

340 TECH needed

txracer

Member

wannadrag

Well-Known Member

txracer

Member

Coronet 500

Well-Known Member

txracer

Member

Cranky

Banned Henchman #27

74sundance

Well-Known Member

txracer

Member

Cranky

Banned Henchman #27

74sundance

Well-Known Member

69 Runner

ADMIN wif a corner office (Deceased - RIP)

Bruce

Member

Similar threads