How to diagnose rod knock vs valve train knock?? Sigh, tired of that car...

[eighty6gt]

...might be worth sending the next change to Blackstone.

I have, there's moderately high iron levels in my oil. It's the oil pump, or the phasers, IMO. Can't really figure it out so you just run it!

 

[Paps]

Finally found the problem.... I have a C shape rod on #8 and crank is hitting piston!
Need a new crank and rods/ dished pistons now to build this motor

 

[eighty6gt]

Probably don't need dished pistons, everyone is running 10-11:1 and 20 psi these days... sheesh!

 

[crownaviation]

If you have a bent rod it is likely the rod making contact with the block or well.. bottom of the cylinder wall. How do you know this for sure?

 

[Paps]

If you have a bent rod it is likely the rod making contact with the block or well.. bottom of the cylinder wall. How do you know this for sure?

Here are some pics:

Piston:

Crank, piston is hitting crank 2 times per revolution, so 2 damaged spots!

Rod, kinda hard to see, but....it's bent for sure.

 

[crownaviation]

well.. yup there is your problem. That was a weird way to bend but at least it did not break! You saved yourself some heads, valves, crank (maybe) and block. Not a horrible thing and certainly could have been worse!

 

[Paps]

Yeah, glad it didn't broke. Crank is also shot. I just bought a complete used motor for $1k and will builld the damaged one. To be continued...

 

[Paps]

Upon further inspection, crank looks "repairable" to me, but i need some opinions.

Here are pics.

I can feel 1 scratch on my nails, nothing more.

 

[eighty6gt]

Magnaflux it, check it for straightness, run it.

 

[Paps]

Ordered:
- frpp 3v head gasket changing kit
- boss rods
- saleen cp pistons + pins and rings
- main and rod bearing from sealed power
- oil pan gasket, water pump gasket, front and rear main seal
- crank washer and bolt, main bearing cap bolts.

What else? I think i covered almost everything by the threads i've read
Are dowel pins really necessary?

This is getting to cost me $$$$$

 

[BruceH]

Paul oneeyewille had a rod bend the same exact way.

What are the dowels for?

Ordered:
- frpp 3v head gasket changing kit
- boss rods
- saleen cp pistons + pins and rings
- main and rod bearing from sealed power
- oil pan gasket, water pump gasket, front and rear main seal
- crank washer and bolt, main bearing cap bolts.

What else? I think i covered almost everything by the threads i've read
Are dowel pins really necessary?

This is getting to cost me $$$$$

 

[Paps]

Cylinder head dowels (to align the heads on the block) F8AZ-6A008-AA

I passed on that, i hope that i won't need it.

Paul oneeyewille had a rod bend the same exact way.

What are the dowels for?

Yeah, and he managed to re-build an awesome motor/car!

 

[Paps]

Who wants a banana?

 

[eighty6gt]

What are these "boss rods?" From what car are they sourced?

I am looking at this stuff:

http://www.jpcracing.com/manley-4-6-5-4-3v-6-5cc-dished-piston/
http://www.jpcracing.com/manley-4-6-h-beam-rods/

Which I'm sure will work for what I'm planning on pushing.

 

[Paps]

2012+ boss 302 mustang rods. 169$ set of 8 with bolts, almost same caracteristics as gt500's rods (read that somewhere)

 

[LAStang1234]

Man that is really good news! That bad boy is BENT!! Lol

 

[eighty6gt]

2012+ boss 302 mustang rods. 169$ set of 8 with bolts, almost same caracteristics as gt500 (read that somewhere)

That's what I thought - but I extinguished the idea earlier because I thought surely the new 5.0 parts wouldn't be the same as our 4.6 stuff.

Great news!

Where are you getting these parts? I might order some shortly.

 

[Paps]

You can order them from "steve at tasca" from here, or by tasca website.

 

[eighty6gt]

Pistons too? Neat, I'll call him next week. Need oxygen sensors anyway.

 

[Paps]

Yep, pistons too. As far you are looking for stock ones. Tasca sells oem parts and frpp only, no manley, diamonds,cp...