Lost Semisphere!
Lost Semisphere!
I posted this under "Winter Maintenance" in the maintenance section for my camhead, but I've got a problem and I'm concerned!!!
Ok, I have a potential situation. Any for real BMW mechanics in the house?
Following re-assembly, I started my bike and the right-side cylinder made a ticking sound. Concerned me, so I shut it down, undressed it, and pulled the spark plugs to see if there was something unusual. Both looked good, I figured it was either a valve ticking or a plug coil arcing. Nothing to see there, so I took off the valve cover, and out falls a cam follower and circlip. Yikes!
The real crux of the situation is that I can't find the semisphere that goes in the cam follower. The semisphere is swapped out to adjust the valve gap. It would appear the semisphere fell out and ran with the oil down into the sump. I drained the oil, and didn't spot the semisphere, and it wasn't attached to the magnet in the oil sump. So I'm wondering where it went - I'm going to inspect the valve springs again and see if I can spot it there.
I'm thinking about the flow of oil. If the semisphere went down into the sump, then the only things down there would be the oil pump pickup (which has a screen in it, I believe), and the oil drain plug. I'm concerned that the semisphere might get caught in an oil galley or somehow restrict oil flow. I'm thinking I need to go fishing with a magnet via the oil galley or the oil plug. I don't think there's an oil pan per-se.
Thoughts? If I can't find the semisphere, would that be concerning? I don't know what size semisphere I need, so I would need to go and pick up a few, try them, set the valve lash, and return what I don't need, I guess.
I'm going to get a magnetic pickup tool and do some fishing. Hopefully I can find the semisphere. Any other thoughts on the matter? What else can I do?
*nervous*
Re: Lost Semisphere!
I found the semisphere. It was lodged in the head. It was easy to miss... Glad I found it! It was located here:
Huge sigh of relief!
Huge sigh of relief!
- David.
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Re: Lost Semisphere!
Pleased you got sorted, don't know about being "nervous", I would have been "having kittens".
Checking & adjusting the valve clearances on a TC (Camhead) is fairly straight forward.
Have done it myself & had to replace one of the shims (semi-spheres).
The Haynes manual says, "Discard the E-clip (circlip) as new ones must be used.
This thread is about valve adjustment, https://1200rt.com/viewtopic.php?t=9, it contains links to a nice set of photos & a video.
Checking & adjusting the valve clearances on a TC (Camhead) is fairly straight forward.
Have done it myself & had to replace one of the shims (semi-spheres).
The Haynes manual says, "Discard the E-clip (circlip) as new ones must be used.
This thread is about valve adjustment, https://1200rt.com/viewtopic.php?t=9, it contains links to a nice set of photos & a video.
- David.
- Subscriber
- Posts: 8300
- Joined: Fri Nov 07, 2014 7:29 pm
- Location: North Yorkshire
- Bike Model and Year: R1200RT (Camhead) 2012
- Been liked: 387 times
Re: Lost Semisphere!
Good job it was a Boxer Twin & an exhaust valve.mbro wrote:I found the semisphere. It was lodged in the head. It was easy to miss... Glad I found it! It was located here:
The inlet might have been a different story.
Last edited by David. on Sun Jan 01, 2017 10:32 am, edited 1 time in total.