Thread: 4-tec weak points?
06-20-2014, 05:00 PM #1
- Join Date
- May 2012
4-tec weak points?
Last weekend, I sheared the flywheel bolts on my '12 RXP-X. When the motor abruptly shut down during a 8450 RPM pass I assumed the worst. (16.5# on the boost gauge)
The code thrown was "60:P0340 Camshaft position sensor 'A' circuit (bank 1 or single sensor)", so on the long drive home I was thinking "broken timing chain" and all of the resulting carnage. I was very happy to find, after pulling the PTO housing, that it was only the sheared flywheel bolts. The worst that happened was the broken bolts made contact with the stator, damaging the windings. I then found several threads on GreenHulk on the topic. Unfortunately, I found them too late to do me any good.
So, now that I have pulled the motor out of the hull to drill the sheared bolts and alignment pin from the crankshaft, are there any other weak points that I should take care of while I'm in this deep? It looks like ARP bolts are the way to go, but are there any other stock fasteners and/or components that are also prone to failure?
Please, no comments like "Remove the SC and install turbo"
R&D intake & exhaust
R&D thermostat kit
Light weight retainers
06-20-2014, 09:56 PM #2
Good possibility some of your bearings are toast. It only takes a split second at those rpms to wreck havoc on the oil pumps and engine bearings. Just did my buddies 09 rxp same shit all the flywheel bolts were sheared. You most defiantly need to pull the engine out and rebuild it. The holes in the crank gear go straight through so getting the bolts out is very easy. The flywheel bolts in my opinion are a major weak point updated or not. Arp seems to be the answer much better material. Sorry to hear about your ski good luck.
06-20-2014, 10:04 PM #3
- Join Date
- Aug 2013
Camshaft sprocket bolts are very soft too........
06-20-2014, 10:12 PM #4
If you feel like doing it, I did all my engine bolts with marine grade stainless steel bolts from mcmasters. There all Allen heads so no more torx crap and they are stronger and only require two tools. Plus there about 100 bucks to do complete engine and engine mounts with spares including the long Pto bolts
06-20-2014, 10:29 PM #5
- Join Date
- Sep 2009
06-20-2014, 10:53 PM #6
06-21-2014, 12:43 AM #7
Last edited by shrabber; 06-21-2014 at 01:00 AM.
06-21-2014, 10:15 AM #8
06-21-2014, 02:32 PM #9
06-21-2014, 02:54 PM #10
Look, My question is! At $14K for these skis and 8500 RPMs!! why aren't they being built with (ARP) this kinda hardware already????
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