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Old 05-01-2006, 10:58 PM   #1
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Default OS V-spec crankshaft????

Hello guys I have a OS V-spec and I just put in a piston sleeve and con-rod. I noticed that the new con-rod has the same play or clearance on the crankshaft than the old one. When I turn the crankshaft it makes a clicking noise due to the clearance that it has with the con-rod.....Is it posible that the crankshaft is worn out where the con-rod sits and if it needs to be replaced??? Is the con-rod the problem or I need a new crankshaft?
Please any input in this problem would be highly apreciated

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Old 05-02-2006, 01:08 AM   #2
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I had the same thing happen to mine it is a bit off putting that the crankpin would wear like that but unfortunately that is the case, but the only solution to your problem is a new crankshaft.
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Old 05-02-2006, 07:25 AM   #3
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All engines wear there...to be honest people thinking a rebuild is just a piston and sleeve is wrong.

Bearings, Crank pin, con rod, wrist pin, and piston and sleeve all see high temps and extreme conditions, do not expect them to last forever.
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Old 05-02-2006, 08:08 AM   #4
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It's a good idea to measure your crank pin for roundness. Use a caliper (preferably digital) and measure the diameter of the pin in a few different places. The measurements will show you if the pin is ovalized.
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Old 05-02-2006, 08:12 AM   #5
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To add to this the most common problem for the crank pin to wear prematurely is dirt. The hardened steel crank pin will actually wear faster that the bronze bushing in the con rod. The reason for this is fine dirt will imbed it self in the rod bushing and then act like a grinder on the crank pin.
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Old 05-02-2006, 08:23 AM   #6
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Thanks for the info guys....
I guess I'll have to buy a new crankshaft and con/rod

thanks again
norman
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Old 05-02-2006, 09:47 AM   #7
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This is kind of a depressing statistic: To rebuild all the wear items in the motor (piston/sleeve, front and rear bearings, conn rod, wrist pin, wrist pin retainers and crank), it costs $20 less than buying a whole new motor. You might as well buy the whole motor and hang onto your old $100 carb and $60 head!
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Old 05-02-2006, 10:56 AM   #8
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you are right skar, it is almost point less to rebuild a motor. Doing it once is the most I'll do.

Don't forget to add in bearings too, those will put you over the $300 rebuild mark.
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Old 05-02-2006, 11:04 AM   #9
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Ray A Racing and OS Rocket both do an excellent job of resizing sleeves. I think for my engines I'll probably resize and replace the rod after break in. After the resize and run in I'll just run them till they're dead...
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Old 05-02-2006, 03:16 PM   #10
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Where can I buy the boca bearings for this engine?????
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Old 05-02-2006, 06:19 PM   #11
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Don't know on the BOCA's.

I've been running the TKO ceramic bearings in my drivetrain and engine, with no problems. I've heard that they're cheaper than the AVID bearings, and a bit higher quality. Check 'em out!

TKO Competition Development- Ceramic Bearings & More
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Old 05-02-2006, 10:57 PM   #12
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Talking bocabearings.com

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a good place to look ... gotta love the search engine
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