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#41
06-01-2016, 01:01 AM
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This time around, I wanted to fabricate the right tool. I hunted around work for a piece of scrap steel approximately the right dimensions. I settled on a steel plate roughly 3" x 6" x 1/2". Then I machined the appropriate bolt pattern for the holding screws, as well as a precision bore for the center hub. Finally I had my friend weld the plate onto a piece of steel tube I bought at a local metal shop's scrap bin for a couple bucks. Happily the tool worked! I have no way of knowing for sure, but I estimate it took about 400 ft-lb to remove the bolt. I had to use a cheater pipe on the breaker bar in order to get enough torque. You could visibly see the pin-hole on the breaker bar elongating under the load. 
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#42
06-01-2016, 01:12 AM
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Today I stopped in at the crankshaft machine shop to have the original crank inspected and to get repair quotes. Repairing my original crank would cost about $325, and include welding + grinding the damaged lobe. The others would be ground & polished as needed to remove any scoring. For this engine, oversize replacement bearings are only available for mains, not for connecting rods. So they would only be able to be polished.
They could also polish the ebay used crank, but didn't recommend that option as highly. That would cost about $165. As long as I'm changing out the main bearings, it seems like the best option is to buy the remanufactured OEM crank + bearing set for $1400. I'm pretty confident I have the best price on that. If I'm re-using the old bearings, then the better play is to repair the crankshaft and reassemble. As can be seen from the spreadsheet, bearings are actually the most expensive part of the project.
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#44
06-11-2016, 07:48 PM
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Nothing too exciting to report; I'm on vacation at the moment. I placed the order for repair parts and it totaled about $2050. I still have not yet sourced a replacement connecting rod, which is a major issue. BMW only sells a set of 6 for $611, ouch.
If anyone has a possible source for an N55 connecting rod, please let me know...
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#45
06-12-2016, 08:23 AM
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Quote:
__________________
12 E70 3.5i xDrive 03 E46 330i ZHP 01 E53 3.0i 98 E36 323is 12 Audi A4 Quattro 79 Triumph Spitfire 73 MGB
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#46
06-12-2016, 04:12 PM
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Quote:
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#47
06-13-2016, 07:00 AM
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Quote:
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#48
06-13-2016, 07:33 AM
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Quote:
__________________
12 E70 3.5i xDrive 03 E46 330i ZHP 01 E53 3.0i 98 E36 323is 12 Audi A4 Quattro 79 Triumph Spitfire 73 MGB
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#49
06-13-2016, 02:04 PM
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Quote:
Bavarian Auto Recycling also said they didn't have any cores. I've cold-emailed a bunch of eBay sellers who sold other N55 components but so far all have said they don't have rods.
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#50
06-13-2016, 02:14 PM
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Update! Using the car-part interchange I found a place with an "engine core" for sale. I called and they agreed to sell me a rod for $150 plus shipping. Expensive, but it sure beats $600 and having to eBay the remainders.
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