help please! crank has broken

[fabian1941]

Dear´s:

It has broken the nose of the crank!
The engine has no more than 500 km in assembly, someone knows why step???

Orientation please!

 

[GhettoRacingKid]

dont worry it will buff out.

but seriously it looks liek the balancers got caught up on something. try to put it back together to see if it was hanging up on something

 

[bigtmoney]

What is that bolt protruding through the crank of pic 4? Did you assemble the engine and accessories?

Whatever did It had to make a grinding sound, you couldn't hear your engine eating is self?

 

[Dennyboy]

did you hammer the ballancer on or use and installer? but that crank is junk.

 

[fabian1941]

Guys:

This engine is in the assembly process (attached pictures)

The combination of the engine is this:

- Block a 020, 4 bolt main block
- Piston, Hypereutectic, speed pro
- Edelbrock E-street cylinder heads
- Comp Cams 280H y kit de lifter
- COMP Cams Magnum Double Roller
- COMP Cams High Energy Die Cast Aluminum Rocker Arms full roller
- Holley Red Electric Fuel Pumps
- oil pump milodon
- water pump milodon
- Harmonic balancer summit http://www.summitracing.com/parts/SUM-161358/
- HEI MSD Street fire
- MSD Ignition 5520 - MSD Street Fire CD Ignitions
- ARP Bolts
- Mini starter
- Flexplate B&M
- Hedman Street Hedders
- Spark Plug wires accel
-Original Crank was used.

And TH350:
- TransKit B&M
- Derale Performance Transmission Pans
- Flex fan automatic transmission
- Torque Converter, Holeshot, 2,000 rpm Stall.

And not hear any screeching sound before flying out the damper and pulley.


Thanks from Chile!

 

[fabian1941]

more pictures...

 

[fabian1941]

more

 

[fabian1941]

Latest Photo.

 

[565bbchevy]

I'm guessing this was a 350 before the overbore and you didn't mention what rods so I will assume stock.
Did you get the rotating assembly balanced with the new pistons?
Did you use the crank bolt to turn the engine over or a crank socket?
Did you use a balancer installing tool and how smooth did the balancer go on?
Your balancer is not the best of quality but probably will work fine and the crank pulley bolts you installed are too long but I don't think either of those had any impact on the balancer coming off.
I'm guessing the threads in the crank might not have been in the best of shape or inproper engagement of the bolt and then the crank bolt worked it's way loose or possibly pulled the threads out and eventually caused the balancer itself to works its way loose taking the key for a ride around the crank.
Did you see any other damage to anything when you tore it down?

 

[fabian1941]

Did you get the rotating assembly balanced with the new pistons?
R. I believe not.
Did you use the crank bolt to turn the engine over or a crank socket?
R. Guess not.
Did you use a balancer installing tool and how smooth did the balancer go on?
R. I believe Yes.
Did you see any other damage to anything when you tore it down?
R. The engine is not revised yet, but apparently it was only the crank nose.

I have no experience to build an engine, so i sent the engine to a mechanical service workshop, where is assembly the engine finally.


Pd: Sorry for my English, it's not very good.