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1985 Kawi GPZ550 crossthreaded oil filter

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So, my dad is a dolt. I noticed at the end of the summer that he hadn't been by my house in a while to ride his bike. When I asked him about it, he admitted that he had apparently crossthreaded the oil filter mount when he attempted his most recent oil change, and it spewed oil from it when it ran... so... no running the bike.

 

Any ideas as to how to fix this? I honestly don't think he's going to ever ride again, given his deteriorating mental state. I'd love to sell it and get it out of my overcrowded garage, but it would be way easier if it ran... without fucking up the engine.

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I would open it up, make an attempt to clean up the threads in the case with a tap, and hope I could accurately thread the bolt.

 

The fine pitch of the bolt threads into the aluminum case.  There's no threaded insert to remove.  There's enough metal there to ream out the case and put in a helicoil, but that's not a job I'd consider looking up at the bottom of a bike.

 

I don't remember the bike well.  If its really pristine, a collector might be interested.  That sucks.

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Assuming an external filter.

 

”Cut” it off if need be.  I believe there is a tool that can “rethread” damaged bolt threads.  Try that to rehabilitate any damage.  Hopefully his fuckup in cross threading didn’t do much damage.

 

Do you have room to get at it with tools?

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4 hours ago, Aunt Zero said:

Assuming an external filter.

 

”Cut” it off if need be.  I believe there is a tool that can “rethread” damaged bolt threads.  Try that to rehabilitate any damage.  Hopefully his fuckup in cross threading didn’t do much damage.

 

Do you have room to get at it with tools?

You assumed wrong.

Cartridge type filter with center bolt.image.jpeg.f27d62d4e17945117ba3a5912fe3aae3.jpeg

Easy to chase the bolt threads with a thread file, but of coarse it's the aluminum case threads that get fucked.  Do they even make Heli-coils for that size?

Not going to be fun, for sure.

Edited by jon haney

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Given the age and make of the bike, I should have known better.  Looks just like my Ninja.  How the Hell do you manage to cross thread that?  I always put it on/in by hand.

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From time to time i buy "used or non running" bikes as winter projects to resell or keep for my collection, If I had a color picture and knew the mileage, I might be interested on a as is basis, only thing is you are a long way from Dallas.  

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Pull it off and take a look.  Maybe re-insert the bolt with only the housing to guide it straight and see if it threads ok.  That assembly is so long that it's hard to imagine it having been cross threaded, but it might be.  Or maybe he just left an o-ring out, or stacked a new o-ring on top of the old one, or maybe there's just something stuck in there keeping the o-ring from seating.

 

If it needs to be heli-coiled it'll be tough to drill it straight.  My thought would be to reinsert the bolt with the housing so you know it's straight and strip the fuck out of it, basically enlarging the hole with the bolt.  That should open it up enough for the heli-coil tap to grab & cut.  Use the housing to guide the tap so that you get a straight shot.  That's assuming they make a helicoil in that size.  The tap provided is a starting tap and may bottom out before cutting enough threads so you may have to cut as far as you can, then grind the end off the tap to turn it into a bottoming tap, then cut the rest of the threads.  If you don't know the 'starting' 'bottoming' terms google them, then what I say will probably make sense.  If not PM me for a phone conversation.

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What if its just adamaged o-ring?

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Nothing says Loctite like cross-thread.  RTV and ship it.

I would check on other forums that have bikes with this type of setup.  Surely this has been run across before and somebody has a fix that probably would rival MacGyver.

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I wondered if it was cross-threaded but hadn't been completely ham-handed in (because it was loose enough to leak) if the damaged threads couldn't just be ground out of existance and the deeper threads used to connect.  The mounting hole is capped because its the feed from the oil pump, so you can't make more threads.  Even with that, you're into engine pullin' and maybe case strippin' territory.

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20 hours ago, srideaux said:

From time to time i buy "used or non running" bikes as winter projects to resell or keep for my collection, If I had a color picture and knew the mileage, I might be interested on a as is basis, only thing is you are a long way from Dallas.  

From Memory (I could be wrong) I believe it's in far from pristine condition, his dad used to ride it in winter. 

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I almost cross-threaded the one on my old Yamaha 650 Maxim.  It wasn't hard to fuck up, if you tried to do it one-handed.   Managed to get it back in straight.  The big problem with those bolts was rounding the 12mm hex on the top of the bolt.  Seriously doubt he could cross-thread and get the cover anywhere close to seated.  Like someone said, there is a lot of thread there.

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On 1/12/2018 at 5:17 PM, jon haney said:

 The big problem with those bolts was rounding the 12mm hex on the top of the bolt.  Seriously doubt he could cross-thread and get the cover anywhere close to seated.  Like someone said, there is a lot of thread there.

 

My old CB650 was like that. It was a bitch to break loose at required intervals.

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I didn't know a 650 existed, I always thought they jumped from 550 to 750.  I had both of those.

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...CB650C  Custom 1981.

 

...not my picture below...

300px-Honda_Cb650Custom.jpg

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That looks like my ex's nighthawk 650 (1982?), from what my dealership told me was never sold stateside, which made it nearly impossible to get parts for the thing. 

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