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meanwhile, please let me ask this question.
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first time i ever seen this type of failure and i run some heavily stressed XT based engines in my supermono and supermoto,
doesnt mean it cant happen, as we see. im always more interested in the "why?" one reason i can think of is heavily lugging at low rpm, but not that provable. when you take the motor appart, check the right main bearing fit in the new cases, if its too loose, that could be another reason. |
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And there have been a couple of catastrophic failures in the same area due to the balance shaft key sheering & then that just detonates the engine case. I wouldn't necessary cal lit a "weak spot" if everything is within spec & maintained its a strong engine, but if something goes wrong (bearing, key way etc) that is where the case will fail. Mezo. |
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ok, thanks I will check. I used the bike as everyday ride for 2 years, and after 3 months of buying it I rebuild the engine, but dint change the timing chain, so in august last year I put the timing chain new, and I used to ride everywhere in Dominican Republic, and I was about to sell the bike before the engine started vibrating when you rev it, I thought it was a bearing but the right crankcase is cracked almost breaking part. I am still waiting for the mechanic to disarm the engine |
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I found this lower engine 3tb on ebay, you think i can use this. It says they took it from a 1996 |
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Mezo, not really following you here... the crack in Traians case is around the main crank bearing, not the balancer shaft.... are we talking the same failure here? or is it just my bad eyesight? :) started wearing reading glasses lately... |
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And traians, G30ff is going to chime in soon (hopefully) in regard to the 3TB engine & whether it can be used, he`s forgotten his password for the site but stay tuned. Mezo. |
Hi Traians
If you're going to fit the complete bottom end in your bike then I'm sure it will be fine, you will need to remove any clutch operating mechanisms on the 3TB and fit the blanking plugs from your engine... you may need to buy new ones if you can't get them out. You will need to check the condition of the 3TB... gearbox, small end, etc. It would be preferable to fit a 4PT if you can find one.. Out of curiosity is the primary drive nut still tight on your engine? Geoff |
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Tel him to TRY and login with ANYTHING and he'll get an opportunity to reset his password - and find out his username if need be, so long as his email address is still valid! If not write me direct with details. |
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Cheers anyhow. Mezo. |
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Thank you very much! My mechanic just send me the picture of the crankcase, its just cracked so maybe im going to repair it. The best crankcase that i found was the one i send earlier. https://rover.ebay.com/rover/0/0/0?m...2F293299270050 I dont put a 4pt because i don’t find one, in dominican republic we dont have parts of this bike. The mechanic send me a picture he disarm the complete engine, tomorrow ill go and send you more pictures. |
use welding as your very very last solution...
even if it's "just cracked", the temperatures of welding can distort the cases, change the tolerance of the bearings fit, etc. a good welder will preheat the complete cases before welding so there is less distortion of course that if you dont have another solution it is better than nothing. |
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Mezo, |
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Hi, mi brother took the cranckcase to get it repair, and its impossible ill have to buy one, the crank bearing has some freeplay. I think im going to order the 3tb low engine because i dont find another one. |
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