New Moto Guzzi Door Mats Available Now
Pull the head and helicoil. What you do not want is metal shavings in the cylinder.ZZ
Bike running fine until one of the plugs loosened up leaving half the cylinder threads destroyed. What’s the repair procedure for this? Any recommendations?[/url]
Timeserts are far superior to Helicoils and worth the extra effort. Here's one I did on the Rear main bearing attach hole.df charta 01 error play storeCiao
Well I suppose timesets are fine, but I will stick with what Lycoming has had in their sparkplug holes from the factory for 70 years. Helicoils. Is this like an oil Thread?
As a retired certifying aircraft engineer on commercial jets you need to be aware that in the aviation business esp the light aircraft end things dont necessarily keep up with the latest technology/best practice. Reason being that that area of aviation baulks at the expense of getting advancements Certified. It's cheaper and easier to stick with what you've been doing for years even though there have been advancements. Even the big end of aviation suffers from this to a certain extent. Add to that the fact that not everything thats good for aviation is good engineering for the auto/motorcycle application. Tig welded CRMo steel tube frames are a good example. Great for fully triangulated light aircraft space frames but not as good for racing motorcycles frames as Bronze welding. Not everything translates.Timeserts are technically better than helicoils and are used by high end manufacturers for brand new components. Professionally and personally I've had Helicoils fail.They used to give quite a bit of trouble on CFM-56 jet engine fuel filter cover retaining bolt holes. A real PITA on a night shift service.Ciao
Add to that the fact that not everything thats good for aviation is good engineering for the auto/motorcycle application. Tig welded CRMo steel tube frames are a good example. Great for fully triangulated light aircraft space frames but not as good for racing motorcycles frames as Bronze welding.Ciao
Now I would never have thought that. I've often mused and fantasized about having a custom motorcycle that was built to aircraft specifications, including wiring, engine assembly and tolerances, and all like that.So, you've mentioned that aircraft TIG welded frames wouldn't be "as good" as bronze-welded motorcycle frames for high stress. In what way are they not as good? And are there other areas like that?Not challenging your expertise and conclusions, but seeking to learn ....Lannis
I assumed that someone failed to tighten the plug but now I am wondering what caused the blowout.I am also thinking buying a replacement is the way to go.I never heard of this happening,is it a known bmw issue and is the slash 6 head the same?
I usually torque new plugs because it is so easy to do. I can also tell you often spark plugs will loosen over time and it is not unusual. Spark plug cap style can probably make things better or worse. In this case you can see there are still what appears to be good threads on the blown out plug. There also appears to be good threads beyond the ripped out threads in the head. So a good guess is the plug loosened over time and then blew out. Repairing a blown out plug with a quality insert would bring this head back to full service. Unless there are other issues involved, there is no reason to replace it. There may even be better reasons to keep it as is.
I can agree that correctly installed spark plugs should never loosen up on their own. But I do find a few that are loose on bikes I work on. Why? Good question. I don't know how these plugs were installed, but I usually look closely at the crush gasket to see if at least that has been seated. Maybe people err on the side of too little torque but still manage to crush the gasket? Warm engine? Anyways as this thread shows, it appears the plug made it's way out about halfway before things went bad.
