Crankshaft Nut Maintenance Suggestions

NoVa Rider · 10-29-2016, 05:59 PM

I am not sure that there is a thread yet specifically on CSC's recommended crankshaft nut maintenance. CSC has a tutorial that covers the basics, but let me add a few notes.

CSC started recommending folks check torque on their crankshaft end nuts at 10,000 miles after one owner had a nut come off during operation, and I believe CSC found at least one other RX3 with the nut improperly torqued. Seems these incidents are rare and I have not yet heard whether the 2016 RX3's have had any issues with improperly torqued nuts. The maintenance is really "just in case."

I just had to replace my shift return spring at about 6,700 miles, and decided to check the crank nut torque since my engine right side cover was off anyway.

In my case, I think the nut was correctly torqued. But there is no way to check without undoing the lock plate, at which point you are kind of committed to removing the nut and installing a new lock plate.

My main comment is to be sure and have the correct lock plate on hand before starting this job. I found that the lock plate for the chain sprocket is not correct for the crank end nut. The chain sprocket inside diameter is about 16.5mm, but the crankshaft end nut lock plate is about 18.3 mm inside diameter.

Second, I had to use a 1/2 inch impact to remove the nut. I don't think there is any other way to get this nut off.

You'll also need a good 10mm allen head socket and a 1/2 inch breaker bar to hold the left side of the crank steady while you apply 100 ft pounds to the crankshaft end nut. Its a lot of torque!

CSC notes that its difficult to remove two allen head bolts that are at the rear of the engine side case. But there is no need to cuss. Just be prepared to use a 1/4 or 3/8 inch sharp chisel and a hammer, notch the edge of the bolts, and then tap them a bit counterclockwise to break them loose. A ball-end 5 mm hex wrench then can get them out the rest of the way.

10-29-2016, 05:59 PM	#1
NoVa Rider Join Date: Jan 2015 Location: Northern Virginia Posts: 144	Crankshaft Nut Maintenance Suggestions I am not sure that there is a thread yet specifically on CSC's recommended crankshaft nut maintenance. CSC has a tutorial that covers the basics, but let me add a few notes. CSC started recommending folks check torque on their crankshaft end nuts at 10,000 miles after one owner had a nut come off during operation, and I believe CSC found at least one other RX3 with the nut improperly torqued. Seems these incidents are rare and I have not yet heard whether the 2016 RX3's have had any issues with improperly torqued nuts. The maintenance is really "just in case." I just had to replace my shift return spring at about 6,700 miles, and decided to check the crank nut torque since my engine right side cover was off anyway. In my case, I think the nut was correctly torqued. But there is no way to check without undoing the lock plate, at which point you are kind of committed to removing the nut and installing a new lock plate. My main comment is to be sure and have the correct lock plate on hand before starting this job. I found that the lock plate for the chain sprocket is not correct for the crank end nut. The chain sprocket inside diameter is about 16.5mm, but the crankshaft end nut lock plate is about 18.3 mm inside diameter. Second, I had to use a 1/2 inch impact to remove the nut. I don't think there is any other way to get this nut off. You'll also need a good 10mm allen head socket and a 1/2 inch breaker bar to hold the left side of the crank steady while you apply 100 ft pounds to the crankshaft end nut. Its a lot of torque! CSC notes that its difficult to remove two allen head bolts that are at the rear of the engine side case. But there is no need to cuss. Just be prepared to use a 1/4 or 3/8 inch sharp chisel and a hammer, notch the edge of the bolts, and then tap them a bit counterclockwise to break them loose. A ball-end 5 mm hex wrench then can get them out the rest of the way.
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