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camshaft bolt broken


zinhe

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hello , i have a big problem.... as usual !

i have replaced my cylinder / head gasket of my 1150 rt 2003

but the bike won't start .... so i decided to see what happened there

until i have seen the bolt of the cam chain sprocket totally broken .

my cylinder is OK my piston is OK no damage at all

 

i have unbolt the rest of the bolt my camshaft is free

do you think that i can try again with a new bolt ?

is it a problem of " synchronization " between the sprocket and the camshaft ?

 

i m totaly lost , i don't know where to find solutions !

thanks for your help !

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How did you manage to break that bolt? I'm sure DirtRider will chime in with great answers to guide you toward salvation. In the mean time, look up installation instructions for "Lennie's Rocket Sprockets". These are cam chain sprockets that advance the valve timing of the R-256 motor. I installed them on the RT I had and also on my R1100S. Search Pelican Parts BMW forum for threads on troubleshooting when someone got his cams out of sequence. These are interference motors so you can have hard parts bang into each other if things are not sync'd. All is not lost......good luck!

 

Hawk

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During a recent rebuild, I snapped one of these bolts. I knew it right away, so I did not proceed any further with the build. Got a BMW replacement bolt (surprisingly reasonably priced for a BMW part) and didn't have any susequent problems. As has been noted, if you turned it over with the camshaft out of synch, possible valve/piston damage. Was the sprocket still in place on the camshaft? Also, inspect the camshaft key and sprocket keyway for damage. That is a bummer.

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hello , i have a big problem.... as usual !

i have replaced my cylinder / head gasket of my 1150 rt 2003

but the bike won't start .... so i decided to see what happened there

until i have seen the bolt of the cam chain sprocket totally broken .

my cylinder is OK my piston is OK no damage at all

 

i have unbolt the rest of the bolt my camshaft is free

do you think that i can try again with a new bolt ?

is it a problem of " synchronization " between the sprocket and the camshaft ?

!

 

Morning zinhe

 

 

It sounds like you have the old broken bolt shank removed from the cam??

 

If so then line the sprocket back up with the cam timed correctly then install a new bolt & torque correctly. (be sure all the oil is removed from the cam internal threads or you risk breaking another bolt)

 

THEN-- turn engine over by hand (spark plugs removed) & carefully check for binding & free turning.

 

If it turns over freely then run a cranking compression test to verify no bent valves.

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hi dirtrider

now i m pretty sure of my mistake.

It's a TDC issue.

before disassembly i found the OT but it wasn't for the good cylinder

so how can i get the good position ?

i have the possibility to get an another headgasket with an another cam /valves on it . How can i determine if this new headgasket will be " sychronise wiht my sproket ?

thanks for all

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hi the bike is an 1150 rt 2003 145 000 km

i have bought a new head-cylinder with cam and valves and new sprocket on it 100 euros ...

i m waiting now the part !

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Hi apparently no!

I have spined manually the cam... And the valves are OK

I have turned the wheel at the good position

Tomorrow I love test it again. I ll tell you

Thanks for your support man!

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So you basically decided to take it apart because you found a good deal on a used cylinder head... Sure makes a lot of sense... or not.

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hi the bike is an 1150 rt 2003 145 000 km

 

Is this the same bike with the broken cam chain guide? Or am I just confused?

 

If it is, how did you resolve that?

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Hello everybody. I have solved all my problems with the bike

TThe engine run!!

I have changed my cam chain guide with a non conventional method.

You can cut 3mm the chain guide and "snap it" in his place.

 

I don't know if this fix will be sure along the kilometers

BUT that was my only solution for me.Some testimonials on Internet appears to be satisfied with this method.

I will tell you....

 

 

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