Rebuilding my counter balance shaft

[brianmcb]

I've got a small press to use at work to do this job, just wondering if anyone had any pointers for me? Besides the obvious like indexing the weights on each end of the shaft..
It's my 951 btw

Thanks!


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[Tytan]

If you have a good press it's not a difficult job bearings are a standard size I got mine from B&B bearing in Surrey index the weights do one side at a time and replace the seal while you have it apart.

 

[brianmcb]

Thanks. I picked up bearings from the dealer this morning. They had them in stock.
Do the bearings only press on so far or do you need to mark where the old ones sit ?


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[racerxxx]

Look for 68ragtops thread on his di, he shows pictures of his cb shaft. You need to Mark the weight, he put a line straight across it on the end on the shaft. Offset it just a bit so that you can see that it only goes on one way.

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[Tytan]

Going from memory which is a little fuzzy these days. I think the weights sit flush with the end of the shaft and the bearing sits up against the inside of the weight. I pressed the bearing on so the shaft was sticking out about 1/2" then used the weight to push the bearing on the rest of the way.

How much did the dealer (GVPS ?) ding you for bearings ? I think I paid $25 total for two bearings from B&B.

 

[brianmcb]

For two outer bearings, and the center one was 70 bucks. RTR performance in kamloops
I bought a factory rebuilt crank from them and figured I might as well just order the factory bearings for the cb shaft also. It's only money.... Lol


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[Tytan]

For two outer bearings, and the center one was 70 bucks. RTR performance in kamloops
I bought a factory rebuilt crank from them and figured I might as well just order the factory bearings for the cb shaft also. It's only money.... Lol


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I hear you there. I replaced the intake and exhaust valves and flywheel bolts on my RXP over the winter and the little bits and pieces add up quickly.

Good luck with the rebuild.

 

[brianmcb]

Tell me about it. With my top end kit coming out of the states, factory rebuilt crank, odds and ends, I'm almost 1600$ into my rebuild


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[Robj]

Tell me about it. With my top end kit coming out of the states, factory rebuilt crank, odds and ends, I'm almost 1600$ into my rebuild


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Ouch!! My last 787 rebuild from SES cost me $900 duty and freight included. But I had to pick it up from Blaine.

Glad to see some locals on the site.

 

[dan87951]

A new factory crate motor is not even that much in the states. At least everything will OEM.

 

[brianmcb]

Factory crate motor here is 2100 bucks plus core


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[brianmcb]

Ouch!! My last 787 rebuild from SES cost me $900 duty and freight included. But I had to pick it up from Blaine.

Glad to see some locals on the site.

This started off as a quick top end rebuild, if I would have known it was gonna be a complete rebuild, I would have drove to the states, shipped my engine to SES, and picked it up in the states to


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[Minnetonka4me]

Anyone figure out where to get the seals on the 951 CBs?

 

[seadoosnipe]

Thanks. I picked up bearings from the dealer this morning. They had them in stock.
Do the bearings only press on so far or do you need to mark where the old ones sit ?


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The easiest way I do bearings on this shaft, believe it or not, is the oven. The CB is milled with a lip on it, so that when you assemble bearings and seals, they will bottom out on those lips (if I'm explaining that right). Take your bearings, put them in an oven and set it for 450-500*F. Put the bearings in the oven for about 30-45 minutes. This will cause the bearings to expand. Using a welding glove, have your CB shaft ready to receive the bearings, then just slide them over till they bottom out on the lip. If they do not go all the way down, remove them and put back in the oven, heat them a little longer, then try again. I use this for many different bearings. I just did the inner and outer bearings on a front wheel hub to my truck. I knocked out both races, but to install them, I put the hub in the over to heat and expand it. When it heated for about 45 minutes, the inner and outer races just fell into place. Within a few seconds, they were set in place.

You must cool them as soon as you slide them on, or before you put the seals on. The bearing will be the only thing hot and it will cool rapidly. The heat will not radiate much, so if you've got seals on at the other end of the shaft already, they will be fine. But once the bearings are on, cool them off with water, then use a Mystery Oil or spray on lithium to displace any moisture that is left over.:cheers:

 

[Tytan]

Anyone figure out where to get the seals on the 951 CBs?

Same as the ones on a 787 counterbalancer shaft 290930390. I used these seals when I rebuilt the counterbalancer shaft on my 98 GTX Limited last year.

On another site it shows 290930390 supercedes to 420930392. For some reason these seals only show up as a separate part number on the 96 and 97 787 parts diagrams.

 

[brianmcb]

Job went easy today. Nothing to it. It was just like tytan said in post #5

Ready to build this sucker now!!!!


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