Prorac1

iTrader: (4)

Excessive thrust in the crank due to a worn thrust bering could cause a crank to walk. Good luck. Eric L

1slo_camaro

iTrader: (2)

Thanks eric. long time no talk man. It sucks I mean im still in a great deal even if I need to buy a 300$ motor and put it in. Was just hoping to get lucky

ChevyOwner

An idea this may be wrong.
Do you know of the hub was pulled?
When I got my last LT1, people said the the balancer was bad as it wobbled. Just for kicks I checked the bolt for the hub. It was too long, and the hub was not seated correctly but the balancer was fine.

Camaro_freak

iTrader: (1)

I'm having trouble installing my crank hub right now. I'm putting a new powerbond hub on my new forged Lunati crank, and after it got a short way on the crank it wouldn't move any further. I even snapped an ARP stud that I was using to pull it on. I was able to wiggle the hub off by hand and discovered it wasn't going on straight and had distorted the inside of the hub. I wonder if the OP's hub could have been somewhat crooked when it was installed.

That being said, any suggestions on how to make sure it goes on straight? I ordered some B7 threaded rod for my second attempt.

1slo_camaro

iTrader: (2)

Thats a possibility. He seemed like a real weiner when it came to mechanics.

I am not sure man i have been out of LT1s for a coupke years and getting back into it and remember all the littletips and tricks and **** to do things

BALLSS

you dodged a bullet by trying to draw in the hub using the crank bolt...assuming you have not stripped/distorted the threads already.

Using the homemade versions of a "install" tool....suggest you get some grade 8 washers and a bearing to sandwich between them and a grade 8 nut to install it. Ideally using the Kent Moore tool if you can find one. They are high $ but very "plug & play" to install/remove hub

guppymech

iTrader: (7)

Since you have aftermarket parts I would measure the crank snout and ID of the hub to make sure there isn't an excessive amount of interference fit. Heating the hub in a oven to 200 deg or so will help it go on easier. Look up the thread on the $12 hub installer tool.

BALLSS

"play" in the crank....there should not be any.

If your "play" is front/back that would point to bad thrust bearing.

If side to side...front bearing is beyond gone....or crank is broken

FWIW I have seen broken crank with car still running, no noise, but damper was way wobble though.

Do you have a cast Eagle crank?

Camaro_freak

iTrader: (1)

No, I didn't use the crank bolt, it was an ARP main stud I had left over from my build. 7/16-20 on the crank end, and 7/16-14 on the other end with a grade 8 nut. I was putting mega torque on the nut and the stud eventually snapped. The crankshaft threads are still good, and the snout itself looks fine also.

I am planning to heat the hub to a few hundred degrees in the oven for the next attempt, along with 7/16-20 threaded rod. I picked up an SBC balancer install tool from Pep Boys to use the thrust bearing to minimize friction. Hoping to avoid getting the Kent Moore tool since I don't plan to do this very often.

Spartan7

iTrader: (7)

Since you want to get technical... GM does in fact call it a balancer.

1slo_camaro

iTrader: (2)

THe best way to explain the *Play* is its like a damn orbital sander haha. but no worries im doing a swap anyway so ill find out later what happened...

I have snapped an eagle 4340 crank behind the #1 main journal which is the reason I got out of LT1s because at the time i couldnt afford to rebuild my 383 a 3rd time so i sold it all and got a daily.

SS RRR

iTrader: (2)

If you are going to use a threaded rod and thrust bearing there will be no need to heat the hub. It will go on very easy.

jaycenk

iTrader: (1)

My bad, they are the same thing. I was under the impression that a balancer aided in balancing the engine rotating mass and a damper was neutrally balanced. As I found out there are several other names as well that all seem to mean the same part. Thanks for the correction

BALLSS

Damper aka harmonic "balancer".

Paul Bell

iTrader: (9)

There's already plenty of experience and good advice in this thread so I have nothing to add but:

I'll say that virtually every time I hear of a crankshaft problem, it's ALWAYS an Eagle crank. For the few dollars more that a better crank costs, why would anybody use Eagle?

1slo_camaro

iTrader: (2)

I will keep this short.... my *Engine Builder* put it together. it was when i was first getting into f-bodys and didnt really know a whole lot. I knew how to put a motor together I helped my old man on several motors but this was my first motor and he recommended it.... I cannot exactly blame eagle though... for the simple fact that after busting a piston skirt, while doing a trans build I took the engine back and asked him to replace the piston..... He did... except on a .030 over motor he replaced it with a stock piston. I will leave it at that.

BALLSS

well if it was the .030 UNDER size piston slapping around or a broken Eagle crank......no doubt it would shake like a dog shiating razor blades

1slo_camaro

iTrader: (2)

i put about 500 miles on it with a .030 under piston and never felt anything.... went to the track and ran about 6 passes and on the way home rolled into it with an evo and when I let off I noticed all kinds of ruckus and saw oil spitting on the front....

jaycenk

iTrader: (1)

I tell ya finding a builder that I don't have to travel hundreds of miles to get to has been impossible. Even when everyone I can find says " This is your guy he can build it for you, he is the best around, he wont steer you wrong." I still manage to walk out with a dick in my *** from everyone of them. In fact that's gonna be my new quote. "I must be gay because every time I walk out of a machine shop I have a dick in my ***." If I had the space and I had the money and I had the time to learn to use all the **** I would own the equipment and do it my self so I can only be made at my self. I actually have a garden of engine blocks started. One of them is mine and the next is headed this way from my buddies ford. If I win the Lotto I will put my current one out to pasture as well.