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My 03 c2 suffered a failed thrust bearing and one main bearing. I had the crank repaired and nitrited by marine Crankshaft in Santa Ana and they did an awesome job. The crankshaft looks brand new.
I was inspecting the carrier and noticed the (not sure of correct term) bearing cradle for tje failed bearing was discolored and has shrunk in diameter ever so slightly. Laying the crank in one side of the carrier with all the bearings in, the crank binds and will not turn. Take out the one bearing and it turns smoothly.
Now I need to have that cradle bored and need some suugestions of any machine shops that can do it. I am in Tampa Florida but don't mind shipping it.
My 3.4 is being rebuilt for the same thing, although I opted for a new (second hand) crankshaft and carrier as this is the "best advice". I would be more concerned about the damage to the Thrust faces as this is difficult to repair (as is the crank).
You can find second hand crank carriers for reasonable money on ebay.
This one in Quebec is from a 3.6 (so they told me when I was looking).
When re-machining the crank carrier on an m96 engine there are a few unique problems that will be encountered.
Since there is no bearings available with a larger "OD" the carrier cannot be just bore out to the next size, the mating surfaces have to be machined to effectively reduce the bore size so that it can be bored to original size bearings.
After the mating surfaces have been machined, now the overall width has been reduced and the carrier will no longer seal to the inside of the case halves. To make the carrier seal to the inside of the case halves the cases mating surfaces will have to be machines to compensate.
After the case halves mating surfaces have been machined, now the cases have to be line-bored.
Then after all that the overall width of the cases have been reduced and the pistons will come closer to hitting the heads and will need to be checked to ensure sufficient piston to head clearance. And if not sufficient piston domes will need fly-cut.
So you can see this can be very complicated and become very expensive with that much machining. Best choice is like Montychristo said, just get a known good carrier !!
I believe that the Boxster S (2.7-3.2) parts fit 3.4, not sure about the 3.6 though. The journals are larger. This is entirely based on trying to find one for my 3.4 motor. DC Automotive probably have some, but they were a bit "spendy" for me.
I don't think you need to machine out the journal on the carrier, the steel insert has just expanded a little with the heat and is now smaller than it was , when the bearing is sitting inside and is tightened up with the crank there is insufficient clearance causing the crank to bind, I would just get it honed to the same size as the one next door if possible by a machine shop and I would think that will sort it? Unless it's too far out of round?
10-15-2017, 12:55 PM
Need crankshaft carrier line bored
