Rebalancing a crank pulley....

[josephrm]

Well, I dropped my damn crank pulley today and it broke a 4mm x 20mm long piece off one side of it. Do you think this could be rebalanced? damnit.

[josephrm]

Well, I was looking at it. The piece that chipped off is such a small amount of mass compared to the whole mass of the pulley. I'm starting to think that it will not matter at all. Anyone have any input?

[Darius]

I dunno, that's sketchy. If anything is out of balance on the end of the crank, it is going to wear your #1 main bearing. I'm sure someone on here has one around the garage. Otherwise, there's always ATI and other manufacturers.

[josephrm]

You're probably right. I don't know enough about the subject to make a decision on whether or not it would be safe. I'm looking for a stock one though, because I'm not trying to spend the huge $$ on an ATI unit right now. Do you think a machine shop could shave the chip down and then balance the unit by shaving off an equal amount of material opposite the chip?

[matafied]

Is it even a balancer?? or is the rubber their to reduce vibration? Just thought I have seen this in the past I also have one with a corner knocked off lol

[josephrm]

it is there to dampen harmonic vibrations only, which is still very important. however, it's not balanced as part of the crank/rods/pistons assembly. the mass of the pulley is just huge compared to the mass of the piece chipped off. I'd say 6000g for the pulley and maybe 1-2g for the chip. maybe i can go find a scale...

I'm going to do some research and a little math and see if it would be viable for me to run the pulley as is, have it balanced, or just get another one.

[Darius]

If you are going to keep the pulley, I'd at least have some material added to the broken area if you can have it done without melting anything.

[skylinegrl13]

i have the same problem, but mine has several large chunks missing on one side. i've got a price request in for an oem replacement at japanparts, i'll post their price when they get back to me. i think i'm also going to contact my machine shop to see if they'd balance it. what would be a reasonable cost for a job like that - anybody?

[Coolwhip]

I wouldn't think more than an hour worth of labor to do that kind of work. So what ever their rates are where you go.

[s14 2510's]

the dampner is balanced by itself from the factory. I would A get a used one from somebody with a blown up rb. Or B have a shop rebalance that one. A local shop here wanted around $40 to balance just the dampner if i remember correctly. I just had my crank balanced with the clutch, dampner and all other parts for $130. I just put the new oilpump drive on so i figured it was best to have that done. The $130 included micro polishing my main and rod journals so i was ready for a new set of bearings.If your using the outside of the chipped damner it might blow the belt off and cause problems down the road. I bet you can get a used one for under or around 50 shipped.

[skylinegrl13]

Japanparts wants $175 for a new one, shipping will probably bring it to around $200.

http://www.japanparts.com/db/p...lkey=

if you look at the diagram, it's part number 12303, not 12033, that is a typo. i'm still going to look into balancing the one i have if done for less than $75.

[rotorimp]

It is kinda like running one of your tires 10psi less than the others--Not enough to notice right away but definitely has long term consequences. Hold out for a good one.

[skylinegrl13]

is the oem replacement for $175 worse than a "stronger" aftermarket version for $500+? maybe a better question is: is the aftermarket version worth $500?

[s14 2510's]

might you just find a used one. There are tons of people who claim they blow up there rb's. Then they just buy a new short or longblock.

[Cjmartz2k]

Let me see how much the local junk yard wants for one with them pulling it. I'm lazy.

[DriftingisLame]

Its in the mail

[skylinegrl13]

so was there a solution? if so is there another one available for under $100?

[josephrm]

Yes, DriftingisLame has sold me his!

[josephrm]

I now have one for sale. I will sell it to you for $60 shipped, the same i payed driftingissLame for it. DriftingisLame, it turns out the chip out of mine was smaller, so I am just going to use mine instead. Thanks though!

[skylinegrl13]

not sure i understand, does that mean the one DriftingisLame sold you was also chipped? if thats' the case then don't worry about it, i'll bite the bullet and order the new one i found. thanks either way though!

[josephrm]

Okay. DriftingisLame told me it was chipped before I bought it and I even saw a picture, but I guess I didn't pay enough attention. No biggie though.