andrew_oc42 Posted October 23, 2016 Share Posted October 23, 2016 Hello, Just wondering what options I have for engine replacement or repair for my 99 TDM 850? As you can see from the photos attached, there is a crack in the engine.. It appears that it's only in the bottom block. I'm finding it hard to source a replacement engine. I'd much rather just bolt out, bolt in if possible, however it isn't looking likely. Is the TRX850 the same engine and interchangeable with the TDM850? If not, what are my options? I bought this bike as a project with the intent to rebuild. I haven't had it started at this stage. After attempting to start it, the starter relay clicks, however the starter doesn't engage or turn over. However the wiring in the bike is horrendous and will require a new loom, so I'm assuming this may be some of the issue. Thank you, in advance Andrew. In this photo it shows the crack with the casing off, which goes right through. (in the red circle) In the yellow circles, it appears that this is the separation point for the top and bottom of the block. Are there any suppliers that make this, or would it be easily accessable? Is there anything I need to look out for especially for my 99 tdm 850? Thankyou. Link to comment Share on other sites More sharing options...
Tommy xs Posted October 23, 2016 Share Posted October 23, 2016 I don't think the trx motor would fit straight in as it has almost dummy second cylinder which contains the airbox, also think the trx motor might be even harder to find. Your best option is probably a dona tdm, keep a look out for one on eBay you should pick up a project or winter hack really cheap this time of year Link to comment Share on other sites More sharing options...
slice Posted October 23, 2016 Share Posted October 23, 2016 First thing I would like to know is why did it crack in the first place? Your going to have to fix that then I would look at getting the thing welded rather than replacing the whole engine. Yeah it looks horrible but are you positive it can't be repaired? Unlikely to be a stress crack it looks like something external hit it and that's what broke it in the first place, probably dropped on it's side so if that is the only damage it would be cheaper to repair it than hunt round for an engine that might be a dog as well. Look for an exploded diagram of your motor and see if the part that's broken is removable then decide where you want to go with it! PS DON'T even think about starting it till you have replaced the damaged part, you have no idea what else is stressed out till you get it apart. 2 Link to comment Share on other sites More sharing options...
pilninggas Posted October 23, 2016 Share Posted October 23, 2016 The TRX850 motor does fit - but they are rarer than 4TX engines. it a difficult call, that's looks like a split crankcase job. I'd be inclined to try to find you local automotive engineer and ask their opinion - sometimes they have kit and techniques that allows them to perform repairs to cracks and breaks without tearing the engine down. 1 Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 23, 2016 Moderator Share Posted October 23, 2016 I agree, also after being caught out buying both car and bike engines over the years, rebuilding that one is a better option. There is no guarantee the replacement engine will be any good long term, it could come with hidden problems or god forbid be from a stolen machine. Stripping that one and fixing it will in the end be the best option, even if you end up needing a lower case that would be a better bet from a breakers than another motor. 1 Link to comment Share on other sites More sharing options...
Tommy xs Posted October 23, 2016 Share Posted October 23, 2016 Is an option but he doesn't know the history of this motor either it could be goosed if its been run in that condition who knows what damage lies within Link to comment Share on other sites More sharing options...
Moderator Cynic Posted October 23, 2016 Moderator Share Posted October 23, 2016 He knows this one is goosed. So tear it down and see how badly then rebuild. Twice in the past, one a v8rover and a 350 powervalve that were running sweetly etc. Heard both running. Neither lasted more than months because of deep down problems. Working out the cost of pulling the motor again and then spending top dolla for gauranteed unit in the case of the v8 i would have been better off fixing what i had. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 23, 2016 Moderator Share Posted October 23, 2016 thats why I'm getting engine bars fitted to mine Link to comment Share on other sites More sharing options...
andrew_oc42 Posted October 24, 2016 Author Share Posted October 24, 2016 Thanks for all of the help thusfar! After a little bit of cleaning and investigating, I found another hole in the engine.. Please find attached photos. Is this also the bottom end? or top end? It appears to be the top from what I can see. Is this also able to be welded? I've found a top and bottom end located in Germany, however I'm in Australia. Would it be worth the freight, or would welding be sufficient? These are apparently for the 4TX. Thankyou for your help, its greatly appreciated Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 24, 2016 Moderator Share Posted October 24, 2016 check the engine number, 4tx should be in there Link to comment Share on other sites More sharing options...
slice Posted October 24, 2016 Share Posted October 24, 2016 That's what I would do if your able to find the part, anything can be welded but it does look like it's had a bit of a hammering. Work out the cost of welding against buying and shipping then make your decision. Don't go off half cocked and buy something then find out 3 weeks later that a repair is going to cost a third of the price. No engine is beyond repair it's just the cost that decides whether it's worth it or not. Don't forget with a new part your going to have to buy all new bearings seals and gaskets as well, it all adds up. Link to comment Share on other sites More sharing options...
andrew_oc42 Posted October 24, 2016 Author Share Posted October 24, 2016 Thanks for the reply. It will cost me approx. $250AU to get the top end and block here and I can have it in approx. a weeks time. Still waiting on a quote to get it welded and rebuilt. Such a headache! Link to comment Share on other sites More sharing options...
slice Posted October 24, 2016 Share Posted October 24, 2016 Fingers crossed mate it will get worse before it get's better. Link to comment Share on other sites More sharing options...
andrew_oc42 Posted October 25, 2016 Author Share Posted October 25, 2016 So I've been informed that apparently a tdm900 engine will bolt straight in.. however I'm very sceptical about this. Can anybody please confirm or deny this? there is a 2001 tdm 900 engine which has been rebuilt which the breakers seems to think it will go straight in.. thankyou! Link to comment Share on other sites More sharing options...
slice Posted October 25, 2016 Share Posted October 25, 2016 What about the electronics? Does he have the loom and all the kit that makes it run? Link to comment Share on other sites More sharing options...
andrew_oc42 Posted October 25, 2016 Author Share Posted October 25, 2016 Yes that's all on another bike which I have access too.. however im more concerned if it will actually bolt in with no modifications? thankyou. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 25, 2016 Moderator Share Posted October 25, 2016 1 hour ago, andrew_oc42 said: So I've been informed that apparently a tdm900 engine will bolt straight in.. however I'm very sceptical about this. Can anybody please confirm or deny this? there is a 2001 tdm 900 engine which has been rebuilt which the breakers seems to think it will go straight in.. thankyou! the 9'ers are alloy frames,fuel injection, etc etc, i wouldn't bother. Are you sure its a 900? they came out in 2001 for info http://www.jbx9.16mb.com/index.php?page=HST Link to comment Share on other sites More sharing options...
pilninggas Posted October 25, 2016 Share Posted October 25, 2016 2 hours ago, andrew_oc42 said: So I've been informed that apparently a tdm900 engine will bolt straight in.. however I'm very sceptical about this. Can anybody please confirm or deny this? there is a 2001 tdm 900 engine which has been rebuilt which the breakers seems to think it will go straight in.. thankyou! to my best knowledge it is not a straight swap: though the gearboxes are interchangeable. you need to get over to carpe-tdm, the guys there will have definitive input - you name it jbx et all have done it. Link to comment Share on other sites More sharing options...
andrew_oc42 Posted October 25, 2016 Author Share Posted October 25, 2016 2 hours ago, drewpy said: the 9'ers are alloy frames,fuel injection, etc etc, i wouldn't bother. Are you sure its a 900? they came out in 2001 for info http://www.jbx9.16mb.com/index.php?page=HST Great pickup!! The 900s came out in 02.. however apparently this was a 12-01 model. I can't tell from the picture supplied I've asked for the model number on he block. Are you able to tell if it's indeed a 900 or 850? http://m.ebay.com/itm/B15-YAMAHA-TDM900-2001-BARE-ENGINE-MOTOR-/182058170504?hash=item2a63833888%3Ag%3AGtMAAOSw2ENW6z7d&_trkparms=pageci%3Aa86e4b95-9ab4-11e6-b650-74dbd1803c16%7Cparentrq%3Afbf857f11570a2af778512d2fffade95%7Ciid%3A1 Thank you Link to comment Share on other sites More sharing options...
Moderator drewpy Posted October 25, 2016 Moderator Share Posted October 25, 2016 looks like its a fuel injection model which the 900's had. looks like the top will fit and put the gearbox inside the 850 http://www.justanswer.com/motorcycle/3qhvl-will-yamaha-tdm-900-engine-fit-tdm-850-frame.html Link to comment Share on other sites More sharing options...
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