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05-07-2008, 10:30 AM
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#1 (permalink)
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Silver Subscriber
Member #1366
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rufer
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Failed valve bucket tappets?
Hello all
Has anyone ever experienced failed (broken) valve bucket tappets? (I'm not sure if it is the right English technical term, it's the piece that you put over the shims and that is in touch with the camshaft)
Not that I had something like that, but we have currently a warning/discussion in the German forum about this. (even if you can't read German, have a look at the images and you will understand)
http://www.tl1000.de/forum/viewtopic.php?t=15643
http://www.tl1000.de/forum/viewtopic.php?t=13207
In short words: Wolfgang observed a number of failed buckets, always on the front EX cam. And he also observed many buckets with hair cracks. So his advice is to check the buckets visually at the next valve adjustment.
--> Anyone ever experienced this?
And do the engine experts have a clue why this would happen? The buckets are quite common Suzuki parts still used in the SV and DL engines.
Greetings
Rufer
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2x TL1000SW, candy jade lime yellow. TL1000cup.de champion 2007, 2008 & 2009
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05-07-2008, 10:56 AM
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#2 (permalink)
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Just call me Ragnar Danneskjöld 
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BikePilot
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I've not seen that before! I think you have the terms right so far as I know 
All I can think of that might cause it would be running with the valve clearances quite loose and/or getting a bit of valve float might tend to hammer them pretty hard. Especially if anyone is running oversized valves (heavier?).
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Josh 
TL Zone Forum Staff - Resident RAIN RIDER
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1997 TL1000S/V
- TLR Akro Evo Ti Exhaust - PCII - 5.5" rear rim & 180/55 - Avon AV45/46ST tires - No Steering damper- Uni Filter -Relocated Temp sensor & 98+ t-stat housing/wp cover - TLRCrazy1 Fan Switch Mod - Dual Star heated Grips - HeliBars - 60k miles.
9k mile summer ride report [summer '08]
Ride report: Oshkosh, Rockies, UT, NV, CA, Bajal [summer '09]
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05-07-2008, 07:30 PM
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#3 (permalink)
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Silver Subscriber
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Ryno
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Only time I've seen it is when the valve and piston meet
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past rides
2000 SV 650
02 Aprilia Falco - sold to pay some bills 
98 TLR - will always be missed
96 GSXR 750 great ol bike
89 FZR 400 Race bike not really missed
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81 GS 1100E still missed
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05-07-2008, 07:39 PM
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#4 (permalink)
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One Liter Duc Eater
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ffaspector
33>150>192>154>101
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I've seen that twice, both in a Mercedes automobile. The first happened very quickly after a head gasket job. The bucket had been lifted and the shim had moved halfway out of its recess causing the bucket to snap in half after about 15 minutes of warmup. The second was unexplained as the broken bucket and valve scored the camshaft and the shim was nowhere to be found  .
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OG Member, TLR Hacking Club.
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05-07-2008, 09:55 PM
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#5 (permalink)
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Silver Subscriber
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The Ring-In
No longer a rain god
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I have seen stress cracks appear in the surface of auto buckets. if you see some and are in doubt then have them professionally tested at an auto engine reconditioner. over revving would be a possible cause, tho they are probably hard chrome plated and this develops surface imperfections which are not likely to cause failure.
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05-07-2008, 11:13 PM
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#6 (permalink)
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The Suck, Squeeze, Bang, Blow Moderator
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Sam
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I've not seen shim buckets fail but I have had a cam gear shear off the exhaust cam.
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05-08-2008, 04:34 AM
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#7 (permalink)
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Silver Subscriber
Member #1366
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rufer
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Quote:
Originally Posted by The Ring-In
tho they are probably hard chrome plated and this develops surface imperfections which are not likely to cause failure.
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The TL buckets are not chrome plated as far as I know.
In the German post Wolfgang writes that you can see the cracks as dark lines. If he sees something like that, he exchanges the bucket.
Overreving could definitely cause this, but this would not explain why it always happens on the front cylinder.
Greetings
Rufer
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2x TL1000SW, candy jade lime yellow. TL1000cup.de champion 2007, 2008 & 2009
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05-08-2008, 08:10 AM
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#8 (permalink)
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AMA Pit Boss
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pmmonster
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Speculation: with the radiator location or other challenges perhaps valve adj. are more likely to be botched on the front cylinder leading to the observed problem?
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05-08-2008, 11:31 AM
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#9 (permalink)
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Just tiny specs in the mirror
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chucks_net
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Hmmm, some geusses
Shit tappets? Maybe the tappet is expanding and cracking the sleeve/ bucket?
Maybe there is not enough lube getting to the tappet/ bucket causing fracture and failure?
Clearances were too loose causing the cam lobe to strike the tappet edge?
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05-08-2008, 11:46 AM
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#10 (permalink)
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Just call me Ragnar Danneskjöld
Member #2079
Posts: 24,440
Join Date: Mar 2004
Location: Cambridge MA
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BikePilot
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Also, if its just the one bike that has that issue, perhaps something isn't right about that specific head causing the tappets to break
__________________
Josh
TL Zone Forum Staff - Resident RAIN RIDER
Questions about The Forums? Click Here
1997 TL1000S/V
- TLR Akro Evo Ti Exhaust - PCII - 5.5" rear rim & 180/55 - Avon AV45/46ST tires - No Steering damper- Uni Filter -Relocated Temp sensor & 98+ t-stat housing/wp cover - TLRCrazy1 Fan Switch Mod - Dual Star heated Grips - HeliBars - 60k miles.
9k mile summer ride report [summer '08]
Ride report: Oshkosh, Rockies, UT, NV, CA, Bajal [summer '09]
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