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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Powder Coating inside Threaded Holes in Clutch Cov /cgi-bin/YaBB.pl?num=1588112304 Message started by philthymike on 04/28/20 at 15:18:24 |
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Title: Powder Coating inside Threaded Holes in Clutch Cov Post by philthymike on 04/28/20 at 15:18:24 Just finishing up changing my clutch plates and cam chain adjuster and suddenly find the oil filter cover bolts getting extremely hard to turn. I'm putting on the clutch cover I had powder coated last spring. So I back the bolts out and noticed that their threads are worn down up to the point they were tightened up to. I poke a tiny screwdriver down each hole and find it doesn't go down far as it should. I do the same thing with the old cover and compare the difference and find 3/8" difference in depth. Back on the powdered cover I start scraping the screwdriver around inside and what's in their starts getting crumbly. I turn the cover over and bang it against a piece of wood. Powder comes out, same color as the coating. The coating place masked off the entire oil filter area but not the bolt holes for the filter cover. I'm pretty pissed off. Can these threaded holes be chased out or do I have to drill and tap them for next bolt size up? Or just keep using the corroded old cover and call it a day? BTW: regarding the clutch, the big 32 mm nut was only hand tight. Was slipping caused by this? |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by Gary_in_NJ on 04/28/20 at 15:38:41 If it’s un-hardened powder (or even hardened) I think you could get in there with a awe or pick of some type and scrape it, or maybe grind down a flat head screwdriver into the perfect tool and grind it loose with that. Then you can simply vacuum it out or hit it with compressed air, but most certainly wear a mask and eye protection. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/28/20 at 15:57:26 It's out. The problem now is the threads inside. I used too much force trying to put the bolts in and the threads on the bolts and the holes are jacked up. It's why I asked about chasing and/or tapping. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by Dave on 04/29/20 at 04:11:28 Yep....chase the threads - what other choice do you have? First use a proper sized drill to get powder out of the hole, then a tap to get the powder out of the threads. Don't use a lube - but do take the tap out repeatedly and blow the holes out. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by Armen on 04/29/20 at 06:17:03 Start with a regular tap. finish with a bottoming tap. Blow out the crap when done. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by justin_o_guy2 on 04/29/20 at 06:55:30 Ohh, Dave,, A drill? If a drill,, hold in fingers,, Make sure that tap is in the original threads and not cutting new ones,, Eye protection and some kinda parts cleaner or something with the Red Straw, WD40 would be okay for blasting clean,, but Dave says No Lube, which I dont understand,, Im sure he has a reason,, |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/29/20 at 07:35:05 Are these JIS type the correct ones? https://www.mcmaster.com/blind-hole-taps/jis-thread-taps/ |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by Dave on 04/29/20 at 07:44:11 233C3A3D20271626162E3C307B490 wrote:
Yea....but one that is the proper size. From the sounds of it the bottom of the hole is loaded up with cured powder, and a tap won't get that out. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/29/20 at 07:54:15 My tiny Philips head jewelers screwdriver worked well for grinding away the buildup in the bottom of the holes. That and banging the cover with a block of wood or rubber mallet. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by justin_o_guy2 on 04/29/20 at 07:57:11 Yeah,, thats a possible I guess, but wouldnt the stuff at the top of the hole have been cured too? I guess the best idea is Go Slow Dont take metal out Check hole depths, compare to length of bolt and consider the part thickness to clamp. A drill bit that is the same size or thousandths smaller than the outside diameter of the bolt is okay.But spinning it in a drill risks the threads inside. Sound about right? If the bolts are messed up, new ones are cheaper than screwing up the case |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/29/20 at 09:01:49 As usual the Clymer book says nothing about the size or thread pitch or any details at all on the cover bolts. Not even torque rating. Are they JIS M5? |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by justin_o_guy2 on 04/29/20 at 11:06:15 Harbor Freight has digital calipers that read metric and Our stuff. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/29/20 at 12:17:24 I'm just going to put the nasty old cover back on. Already started scraping the gasket off. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by verslagen1 on 04/29/20 at 13:58:54 I think they are M6x1.25 |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 04/29/20 at 14:05:11 2B382F2E313C3A38336C5D0 wrote:
Thank you. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 05/04/20 at 09:48:42 Problem solved! The correct size is M6X1 |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 05/04/20 at 10:13:56 For future reference. |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by justin_o_guy2 on 05/08/20 at 12:05:05 Ive used a Dremel to run a slot up bolts to make it chase threads.. You better hope Ol Stan doesnt find out you stole his nut driver handle,, |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by philthymike on 05/09/20 at 07:52:46 I borrowed Stan's driver handle from my old lady. Which leaves me wondering why she has his nut driver :o |
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Title: Re: Powder Coating inside Threaded Holes in Clutch Post by justin_o_guy2 on 05/09/20 at 10:39:57 You just might need to have that conversation with her.. |
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