07-14-2018, 01:50 AM | #1 |
Join Date: Mar 2018
Posts: 32
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centrifugal oil filter hawk 250
Hey, guys got a problem my centrifugal oil filter fell off inside the engine. so now the end of the crankshaft threads are messed up I'm trying to find out what size the nut is that goes on the end of the crankshaft that holds the centrifugal oil filter on where I can get the right die to rethread. I can't find much info and what I got is confusing. I brought the nut to a local machine shop they measured 15mm on the inside. So I called ricky power sports and they said it's 16mm so I don't know. I will attach some pics if anyone knows I would greatly appreciate the help and thanks ahead of time.
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07-14-2018, 02:17 AM | #2 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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If the machine shop measured the inside diameter of the nut, then they didn't account for the depth of the threads cut into it. Metric thread sizes are based on the shank size of the bolt (crank in this case), so if if inside of the nut is 15mm, and the threads are .5mm deep on the crankshaft, this would make the nut an M16 (not a very good machine shop if they don't know this).
If you have a pair of vernier calipers (you can get some digital ones cheap at harbor freight) then you can measure the O.D. of those threads on the crankshaft. Obviously your reading won't be precise since the threads are damaged, but if it reads something like 15.8, just round up to 16. So if we know it is an M16, then to get the thread pitch you will need to measure the distance between the thread peaks in a straight line on the crank shaft. If they are 1mm apart, then it is M16x1.0, If they are 1.5mm apart, they are M16x1.5, and so on. You can use those same calipers to approximate this distance as well. This link can possibly explain it better. https://www.boltdepot.com/fastener-i...iandpitch.aspx If I had to guess by visual, then I would say it is an M16x1.5, but I would measure to know for sure. It is unusual for this type of failure to happen, so the only thing I can assume is somebody at the engine factory installed the bevelled washer in backwards. The washer should have a stamp on it stating which direction is out. If it is installed backwards, there is potential for the nut to back off. example: https://www.cscmotorcycles.com/fckim...acement/28.jpg
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07-14-2018, 02:21 AM | #3 |
Join Date: Jan 2012
Location: ChCh , NZ
Posts: 2,265
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thread gauge will give you the tpi of the thread...
look like a small pack of saws... simular to feeler gauges... ..
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07-14-2018, 02:28 AM | #4 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
example. https://www.lowes.com/pd/IRWIN-Metri...4aAoDaEALw_wcB One of these can also be used, and is quite handy to keep around. https://www.ebay.com/itm/Screw-Bolt-...4383.l4275.c10
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07-15-2018, 02:04 PM | #5 |
Join Date: Mar 2018
Posts: 32
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Hey, thanks megadan and Pete u guys were very helpful I picked up the tools mentioned seems its a 16mm 1.0 thread depth. only thing now not sure to get a right or left tap to cut the threads. And ya Meagan I heard this is an unusual failer not sure witch way that washer was installed since everything was free floating. I tell ya I have had nothing but bad luck with this bike so far from dealing with the texas power sports crap and engine problems now can get a little frustrating.
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07-15-2018, 02:40 PM | #6 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Looks like right hand threads to me. Standard Righty Tighty.
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07-15-2018, 05:15 PM | #8 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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No problem, it is what this forum is about. Once you get everything sorted out you will be able to enjoy the bike. Stick with it!
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07-28-2018, 11:59 PM | #10 |
Join Date: Mar 2018
Posts: 32
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Wow did not know it was 60ft.lb. it does look hard to tighten wonder if I could just use my impact gun on it if I was carefull.
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07-29-2018, 02:11 AM | #11 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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You could also thread some small rope through the park plug hole and turn the engine by and until it stops the piston in place to hold the crank still. Obviously, make sure the rope can be pulled back out lol. Also a handy trick to hold up valves if you want to change the valve stem seals without pulling the head.
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07-29-2018, 10:12 PM | #12 |
Join Date: Mar 2018
Posts: 32
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Thanks megadan for the tips very usefull information. I just stuck a penny between the gears I was in a hurry to get going again seemed to work so there is another way to stop the crank for future reference for everyone.
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