Worn cams on 07 K12GT - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old May 8th, 2019, 12:46 am Thread Starter
Mel
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Worn cams on 07 K12GT

Took the bike into the local dealer for a valve check and plug change. Both cam shafts show wear on the lobes. They appear to have worn thru the hardened surface. The cam followers feel rough when a feeler gauge is pushed in. Bottom line: itís buggered.
Oil changes were done regularly with the approved lubricants. Current mileage is 65K miles.
Anyone else experienced this problem?
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post #2 of 7 (permalink) Old May 8th, 2019, 11:23 am
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Originally Posted by Mel View Post
Took the bike into the local dealer for a valve check and plug change. Both cam shafts show wear on the lobes. They appear to have worn thru the hardened surface. The cam followers feel rough when a feeler gauge is pushed in. Bottom line: it’s buggered.
Oil changes were done regularly with the approved lubricants. Current mileage is 65K miles.
Anyone else experienced this problem?
the case hardening may have been poor / substandard at time of manu
the conditions of use can exacerbate wear, lots of idling, stop starts, temperatures its operated under
any time a cam is below 2k of speed high load and wear takes place
any cold start takes 10k miles of running in ideal temperatures / conditions off an engine's life
or the type of use, no engine should be used hard when its cold, if the oil is below 80C keep the engine under 5k and the load light, you should always have at least 10 miles of running under the belt before exploring 6k rpm or more than 50% throttle
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post #3 of 7 (permalink) Old May 13th, 2019, 9:14 pm
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Some of BMW's Big Six engines from the 60's through 80's - the M30 - had issues with oil feed to the front-most cam lobe but it didn't show up in 65000 miles as yours apparently has. The weak spot was the front bolt through the oil spray bar would loosen and the bar would lose all pressure, resulting in uneven oil delivery, and a work cam lobe or several if not checked.

Surprising that yours went bad at 65,000, had you had your valves adjusted? That service procedure should have caught the problem.
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post #4 of 7 (permalink) Old May 15th, 2019, 8:01 pm Thread Starter
Mel
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The chap I bought the bike from had them checked ~20k ago. Iíve got the work order. They were good then.
I changed the oil faithfully with rated oil since.
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post #5 of 7 (permalink) Old May 16th, 2019, 8:34 am
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You are supposed to have a full service with valve clearance check and adjustment on these bikes every 10,000 miles. So that would be way overdue. Sorry.
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post #6 of 7 (permalink) Old May 16th, 2019, 11:32 am
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You are supposed to have a full service with valve clearance check and adjustment on these bikes every 10,000 miles. So that would be way overdue. Sorry.
Valve adjustment is at 18,000 miles per BMW RepRom service manual.

2009 K1300 GT
2005 R1200 RT - gone
2008 Honda CBR1000 RR - gone
1984 Kawasaki ZX750-E1 Turbo
1990 Kawasaki ZX600R

Last edited by TF1200RT; May 16th, 2019 at 4:52 pm.
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post #7 of 7 (permalink) Old May 16th, 2019, 1:35 pm
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do the cam lobes run directly on to the shims? if so could be cheap nasty shims failed and took out the cams...

type of use... not warming it up, too much idling etc. all put massive stress on the lobes, if they were close to wearing though they could go the next day after the where checked professionally
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