Soren Frimodt Posted February 23, 2009 Share Posted February 23, 2009 Hi chaps. My mate is running one of these lovely TD5 engines in his 110. It started overheating and had a "Ticking" noise from the engine. So he decided to take it apart to find out what was going on, and look what he discovered! Never have I seen such bad engineering in my whole life! (And I often repair china bikes) I really don't hope the engine was fabricated this way?? Could anybody shed some light on this? Thank you from a shocked dane Quote Link to comment Share on other sites More sharing options...
Rich_P Posted February 23, 2009 Share Posted February 23, 2009 The ends look a bit rough. In fact, where are the locating "tags" (cut outs) in the shells? Quote Link to comment Share on other sites More sharing options...
white90 Posted February 23, 2009 Share Posted February 23, 2009 That is how they should be the are forged that way the two halves join perfectly there was a fracture point across the middle of the cap each one has less machining required on assembly. Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 23, 2009 Author Share Posted February 23, 2009 Wondered that myself.. But don't think they're suppose to be there.. But what I can't get 'round my head, is that if this is a failure from running, and not a fabrication failure. How on earth could it happen? Quote Link to comment Share on other sites More sharing options...
white90 Posted February 23, 2009 Share Posted February 23, 2009 O yes they are take a pic of the corresponding con rods I bet there'll be a mirror image of each cap. Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 23, 2009 Author Share Posted February 23, 2009 Sorry white90 too slow If this truly is how it suppose to be, I am speechless.. Quote Link to comment Share on other sites More sharing options...
maxtherotti Posted February 23, 2009 Share Posted February 23, 2009 they look the same as mercedes heavy commercial rods cracked joint not machined i would go with white90 and say thats how they should be rob Quote Link to comment Share on other sites More sharing options...
white90 Posted February 23, 2009 Share Posted February 23, 2009 Modern methods for design all comes down to cost in the end. search:fracture split connecting rods Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted February 23, 2009 Share Posted February 23, 2009 They look to be 'fracture split' to me - they're cast with a notch in them and then hit with a hammer (but more cleverly). It's a manufacturing technique to prevent the two halves from 'fretting' against each other - nature ensures they fit perfectly back together again and it just happens to be quicker to make them too because there's two fewer machining operations. The bearing shells I can't speak for... Quote Link to comment Share on other sites More sharing options...
cipx2 Posted February 23, 2009 Share Posted February 23, 2009 This is how they're supposed to look like. I don't see anything wrong. The bigends are fractured the same way you would fracture your forearm if you'd want to and they are left like that. The rough surface on the ends looks as supposed to. I hope you made notes/marks as to what cap goes to which conrod and which way round ... Quote Link to comment Share on other sites More sharing options...
cipx2 Posted February 23, 2009 Share Posted February 23, 2009 Here's a very short description of the method: http://www.mag-powertrain.com/technologies...g-assembly.html Quote Link to comment Share on other sites More sharing options...
western Posted February 23, 2009 Share Posted February 23, 2009 never seen big end caps with a finish like those before. seems to be a stronger fit according to the linked info ^^^^^ Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 23, 2009 Author Share Posted February 23, 2009 Okay, thought somebody on here would know I have never heard about this fracture splitting of conrods before, but get the idea. But still I think its a crappy way to do it, what if one egde of at fracture touches another, just a bit, when tightening? It would go all pairshaped (hope its spelled correct) and result in slack.. Well as I wrote earlier it is just a friend of mine who has send the pictures. So I hope he knows which ones belong together. Quote Link to comment Share on other sites More sharing options...
GBMUD Posted February 23, 2009 Share Posted February 23, 2009 what if one egde of at fracture touches another, just a bit, when tightening? It would go all pairshaped (hope its spelled correct)and result in slack.. Crank shafts and big end shells are made to very high tolerances so as long as the crank and shells are good quality they should be fine. Chris Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 23, 2009 Author Share Posted February 23, 2009 I repair bikes for living, and often they use locating dowels to prevent the cap from sliding around, but ofcourse there is bound to be a huge difference in production cost on these two solutions. Quote Link to comment Share on other sites More sharing options...
stobbie Posted February 24, 2009 Share Posted February 24, 2009 I think the td5 is the best engine land rover had ever produced. My TD5 Disco is now approaching 400000 km's, all with a 3 tonne trailer at 120 KM/h, I haven't had a single engine problem. Doesn't smoke and doesn't use any oil... My 300 defender is good, but my td5 is way better...(but today went to see a tdv6, and think I'm going to buy that tomorrow, hope it will be as good as the td5) Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 24, 2009 Share Posted February 24, 2009 The Td5 is an engine that thrives on work - I know of a couple that must be pushing towards 200k miles and still run perfectly, and that's down here which is probably worth double that mileage on a European motorway. Conversely the ones that are low mileage never-been-warm shopping trolleys seem to F up in double quick time - I've heard of a couple with serious bore wear problems at very low mileages (20-30k I think). I still don't like them though, never have. Quote Link to comment Share on other sites More sharing options...
Shackleton Posted February 24, 2009 Share Posted February 24, 2009 Mines of the 'lose oil pump' era and although I don't know for sure I guess it's done around 120k at least and I put another 10k on top of that around Europe and yeah mated to my RRC axles it goes slow and revs high but I LOVE it. And I'm a V8 man. But it's just been rock solid and I've given it dogs abuse by times. Hell on the oil pump thing, when I did a once over on the lump before setting off on my adventure I was pretty sure I over torqued the bolt on the pump sprocket but I still have oil pressure so... I love that thing Td5's do when you come off the gas to idle, the way it kinda dips and goes quiet before settling back to that 5pot chattery idle. God I miss my RR The cap cracking thing makes sense, must provide more surface area too? Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 25, 2009 Author Share Posted February 25, 2009 This particular engine has only done 155kkm. And a piston-ring has snapped along with a broken piston. He's getting aprox. 170 hp from it, and ofcourse that won't improve the lifespan.. But it has only been tuned to this degree for a couple of years. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted February 25, 2009 Share Posted February 25, 2009 Ah now you say he has been messing about with it , and he is complaining ? Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 25, 2009 Author Share Posted February 25, 2009 Haha.. yeah suppose you could say so Quote Link to comment Share on other sites More sharing options...
Lara Posted February 25, 2009 Share Posted February 25, 2009 Replaced mine with some proper rods Lara Quote Link to comment Share on other sites More sharing options...
BogMonster Posted February 25, 2009 Share Posted February 25, 2009 Pah - they look like they have been hammered out of a baked bean tin to me Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 25, 2009 Share Posted February 25, 2009 Lara, they look lovely, but seem like fracture split still? (not saying that's a bad thing ) Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted February 26, 2009 Author Share Posted February 26, 2009 Looking very tasty Lara! where did you get those? Quote Link to comment Share on other sites More sharing options...
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