Bike Quit At Work

[steve hawkins]

Feel for ya buddy, wish I could be there to help you tear it down.

Keep us all informed.

Rev Light

[Tony Smith]

I am interested to know the underlying cause. for what it is worth I am more inclined to think things like a broken key on a sprocket or a broken camshaft than a chain failure. Bizarre as it may seem the chain is grossly over-engineered for the job it does (the original duplex chain even more so) and I think that the key ways are a weaker link.

[montmil]

If there's even a tiny little upside to this event, it's that the Gates of Hell are just barely cracking open in the Phoenix area. Could be worse...

[smiley=furious3.gif] Summer Oven!

[Bob_Roller]

That's the other factor in this, the 'hot' season is just starting, predicted to start approaching the 100 F, 38 C range this week .

[Ed Miller]

I have three valve spring compressors.  None work on my R65, I just couldn't fit them into place.  I don't think they work on my Triumph, either.

[georgesgiralt]

Removing the valves is easy using a rag into the combustion chamber, head on the bench. Put a tube wrench on the valve large enough to let the valve stem and lock pass into the opening.
Press the wrench on the valve spring and put a fast hammer on the wrench. Not large force, just fast. This will compress the spring enough to liberate the two stops which will become loose in the tube wrench and you're done.
Putting them back is more difficult without a valve compressor but can be done... Of course, you'd better reserve this to a repair in the middle of nowhere and preferably in a sand desert ...... Much more fun ...

[Barry]

I'm with Georges. In the absence of the correct tool using some ingenuity will usually get the job done. I've used a small drill press to push down on the upper spring plate while supporting the valve head underneath with a suitable piece of wood.  

[Bob_Roller]

I've got an arbor press and large C clamps, I can get an oxygen sensor socket, it's got a large slot cut in the side for the sensor wire, I think that will work if the spring compressor won't fit .

[Bob_Roller]

The furnaces of hell have finally relented here in the Phoenix area !!!!!
Went to work on the bike this morning .
The cam chain is the failed part .
Can't tell what went wrong, the chain is in three pieces .
The master link has a sheared pin, at the groove for the  spring clip .
I'll have to remove the oil pan, can't find the spring clip for the master link in the timing chain area .
I pulled the heads and I cannot see anything visible for contact area on either piston .
There's a bit of combustion deposit on the right cylinder intake valve that looks like it was disturbed, but I can do the same thing with my finger nail on the other valve .
Valve compressor won't work, not enough room to get it on the spring properly .
Put the push rods against a straight edge couldn't find any distortion on any of them .
I'm thinking about replacing all of the seals, gaskets that I disturbed and putting it back together again .
It doesn't appear that any damage was done when the chain failed .
Any thoughts or comments on this ?

[Bob_W]

With head off, it is easy to pour some gas or something into the head to check for valve leaking. I would pull the oil pan and be worried until I found all the missing pieces. If the valves don't leak, I would reseal, new chain and try it. I am not an expert and have mistakes in the past.
Bob

[Bob_Roller]

I poured paint thinner into the intake and exhaust port areas, no leakage found after 3 hours .
The only part I can't find, is the spring clip, there is a hole for oil to drain back into the sump, right under the area where the chain was doubled over on itself on the right side by a rub block .
I'll order parts today .
Held off on the parts, until I had an idea what happened and how bad it was .  

[Bob_Roller]

All parts ordered from Motobins  at 1300 local time November 05 .
Lets see how long it takes for them to travel from the UK, to Phoenix !!!
It looks like I saved around $200US, over ordering the parts from the local BMW dealer .

[Bob_Roller]

Received an email from Moto-Bins at 354 AM Phoenix time, 1054 AM UK time,  that my order has been filled and shipped via Royal Mail .
All of the parts were in stock .

[Lucky_Lou]

My guess would be you will have the bits in about a week best of luck with the rebuild.
Lou

[Bob_Roller]

At this point in time, doesn't appear that this will take too much time .
I'm guessing 6-8 hours for reassembly, unless some unknown issue arises .
I don't mind being out in the garage now, only getting to 87 F, 31 C  now in the afternoon .