Chris Wilson Posted March 10, 2006 Share Posted March 10, 2006 It definitely had the start of tired big ends, and that was some time ago. Now it's running on 2 turbos it may have exacerbated things Link to comment Share on other sites More sharing options...
Digsy Posted March 10, 2006 Share Posted March 10, 2006 It definitely had the start of tired big ends, and that was some time ago. Now it's running on 2 turbos it may have exacerbated things I'm sure you've knocked out your fair share of big ends in your time, Chris. What do you make of it being quiet above idle? Maybe it only does it when the oil pressure is low at low RPM? Not low enought to light the warning lamp but still relatively low. Link to comment Share on other sites More sharing options...
piehound Posted March 10, 2006 Author Share Posted March 10, 2006 4 garages me and and 3 other people all said its the big ends, the noise is a dull knocking from the bottom on idle after that it goes due to there being more tension on the conrods taking any play out of it if it gets worse it will get louder and constant , well thats why i see it and the way it was explained to me, oh well be sorted soon hopefully Link to comment Share on other sites More sharing options...
Digsy Posted March 10, 2006 Share Posted March 10, 2006 Fair enough if you have a consensus but I've done a quick websearch and most of the references to big end knocking I can find says it should get worse with engine speed, or at least remain constant, which makes more sense to me than it going away as engine load increases if it is a big end failure. The other explanation that fits the symptoms is that for some reason you have low oil pressure across the board, but only low enough to cause a knock at idle, in which case the noise is indeed your big ends, but the cause isn't, if you see what I mean. Anyway, like you say I hope you get it sorted. Link to comment Share on other sites More sharing options...
piehound Posted March 11, 2006 Author Share Posted March 11, 2006 yeah thanks digsy the cause may well be oil pressure that i wont know till it get checked out like i said its only done a few miles since i heard the knock if it needs a pump its getting 1 in for apenny in for a pound thanks for your help matey Link to comment Share on other sites More sharing options...
piehound Posted March 18, 2006 Author Share Posted March 18, 2006 booked in for monday to ripped to bits and rebuilt and the guy is checking and reshimmimg my head if needed and gonna do the valve stem oil seals as well although he doesnt know it yet.anyone know a simple way to check the oil pressure ? or pump Link to comment Share on other sites More sharing options...
piehound Posted March 22, 2006 Author Share Posted March 22, 2006 well its the big ends as thought i also need a new crank as a grind wont work as the proper shells do not go up to the size i need, i need a new conrod as the shell spun , as for the cause by changing the oil i have washed all kinds of crap down to the sump and blocked the oil pickup filter, so ive told the guy to replace the rings ,valve stem oil seals as well as the rest, on a +note they found an earth off the ecu and a sticker on saying this has been chipped and remapped etc , i now know why the button to up the bhp didnt work but he thinks its been disconected due to it having the cats on the cats have now gone see pic below for the cause of this evil crime and now im getting a rebuilt motor Link to comment Share on other sites More sharing options...
chilli Posted March 22, 2006 Share Posted March 22, 2006 as for the cause by changing the oil i have washed all kinds of crap down to the sump and blocked the oil pickup filter so you just did a normal oil change and you think it caused it? is there any way to avoid this crud build up? regular oil changes I guess, what about oil flushing stuff before a change? I take it you can't get to this gauze filter easily, it is in the sump as part of the pick up? Link to comment Share on other sites More sharing options...
piehound Posted March 22, 2006 Author Share Posted March 22, 2006 the car has full service history and the oil has been changed regulaly all i did was drop the oil refill it with 15/50 and a new filter and 100 miles later the noise started and i was doing most of that around town, it was exactly the same tune thats posted on the clip on the other thread at the moment, i dont think flushing an engine is a good idea anyway unless you take the sump off to clean all that crap out on the pic, oh well im getting a full rebuild,rings and all and yes that filter is the start of the oil pick up in the sump Link to comment Share on other sites More sharing options...
TRD3000GT Posted March 22, 2006 Share Posted March 22, 2006 I vote for the new short block ! £1800 and all the problems are sorted Link to comment Share on other sites More sharing options...
Lucifer Posted March 22, 2006 Share Posted March 22, 2006 You would still need to get that Assembled. 2 of the last 3 Iv'e had have been out of tollerance by nearly 200% on the Big ends in once case. Link to comment Share on other sites More sharing options...
adi2009 Posted March 22, 2006 Share Posted March 22, 2006 You would still need to get that Assembled. 2 of the last 3 Iv'e had have been out of tollerance by nearly 200% on the Big ends in once case. Could u elaborate on that a bit pl. do u mean that the some of the shortblocks are faulty??? Link to comment Share on other sites More sharing options...
Guest Terry S Posted March 22, 2006 Share Posted March 22, 2006 You would still need to get that Assembled. 2 of the last 3 Iv'e had have been out of tollerance by nearly 200% on the Big ends in once case. Edited coz I cant be arsed. Link to comment Share on other sites More sharing options...
Digsy Posted March 22, 2006 Share Posted March 22, 2006 ...as for the cause by changing the oil i have washed all kinds of crap down to the sump and blocked the oil pickup filter... I would hope that the debris on the oil pickup filter is a symptom of your big end failure and spun bearing, rather than the cause. If the latter is the case you have to ask yourself (a) where did all that crap come from in the first place and (b) how many other Supras are there out there with 90% blocked gauzes? In the runup to your failure, did your oil pressure warning lamp take an unusually long time to go out? Link to comment Share on other sites More sharing options...
chilli Posted March 22, 2006 Share Posted March 22, 2006 I would hope that the debris on the oil pickup filter is a symptom of your big end failure and spun bearing, rather than the cause. If the latter is the case you have to ask yourself (a) where did all that crap come from in the first place and (b) how many other Supras are there out there with 90% blocked gauzes? In the runup to your failure, did your oil pressure warning lamp take an unusually long time to go out? That's exactly what I'm thinking, either we should all be worried or it was just the outcome, not the cause. I'd hope it's the latter. Link to comment Share on other sites More sharing options...
piehound Posted March 22, 2006 Author Share Posted March 22, 2006 no it was the cause the guy doing it has done at least 10 soops all went the same way thats why i took it to him, the problem appears to be i have full service history and the guy told me the oil was changed all the time but was it? this was the first oil change i done on it, although cw did say he thought it had the start of something on start up about 800 miles ago, the damage to look at is minimal and no signs of missing swarf just the 1 conrod and 1 shell spun, i will post pics up of the crank etc next time i go up there probably after tuesday , the oil light was normal no indication of any probs, the only thing i can think off as it had high miles i was advised to use 15/50 oil maybe it was too thick to clear the blocked gorse?? where as 10/40 may have been ok ? Link to comment Share on other sites More sharing options...
chilli Posted March 22, 2006 Share Posted March 22, 2006 hmmm that's slightly worrying. If the sump were easy to get off I'd take it off and clean the gauze, but I hear it isn't at all! I've got some 10/50 waiting to go in, should I be worried lol... So CW thought he heard a rattle or something a while ago? must be keen ears there Link to comment Share on other sites More sharing options...
piehound Posted March 22, 2006 Author Share Posted March 22, 2006 yes it was there but for about 2 seconds on start up it wasnt defenate to me but obviously cw was right, yes the sump is twat to get off thats why i didnt just do the shells as when it went again it would mean all the assing about and spending good money after bad, i did have a golf many years ago that had a blocked pickup but was easy to drop the sump to see and clean it, but after what happened to mine i think taking a peep could save £1000s i know lol Link to comment Share on other sites More sharing options...
Digsy Posted March 23, 2006 Share Posted March 23, 2006 So you are saying that this guy reckons your car hasn't had proper oil change intervals, and that when you changed the oil yourself you "washed all that stuff down into the oil pan" whereupon it then got sucked up into the oil pickup pipe and blocked it? This might be wishful thinking on my behalf but I don't buy that. What is all that stuff? Is it metallic? Where was it just hanging around in the engine before you changed the oil? If it was in the system somewhere than it would probably do more damage there than when it got to the sump! AT least then it was on the right side of the gauze, even if there was so much of it that it effectively got blocked. When you drained your oil were there any bits in the stuff you drained out? Also, if one mechanic has seen 10 Supras with the same problem I'm sure that more than one person on here would have experienced it for themselves. Can you post up pics of the spun bearing and the damage to the crank and rod? How many miles has your car done? Link to comment Share on other sites More sharing options...
Digsy Posted March 23, 2006 Share Posted March 23, 2006 Ah hold on. You mention "flushing the engine" in an earlier post. Did you use some kind of oil additive? Link to comment Share on other sites More sharing options...
piehound Posted March 23, 2006 Author Share Posted March 23, 2006 no i just changed the oil what i also said was i used 15/50 and it may have not helped the already partially blocked filter the car had done 111k. the guy doing it has been, and all he does is engine rebuilds since 1980, i havent got the con rod or crank pics yet as i wont be going back there till tuesday as thats when all the bits arrive, the shite on the filter wasnt all metal some of it looked like sand or grit and for want of a better explanation carbon even. the 10 soops statement probably means hes done a few not 10 and he may well be refering to the early fellas too and he did say before he stripped it he was looking for something blocked somewhere, he has now gone away for a break so until his return im only dealing with 1 of his engineers, the bores are also perfect and not in need of rebore although i am having new rings fitted as im going thus far with the rebuild and there was no sign of any other blockage or crap around the engine Link to comment Share on other sites More sharing options...
piehound Posted April 5, 2006 Author Share Posted April 5, 2006 well im supposed to be getting back today all done and rebuilt, new big ends ,new conrod,valvestem oilseals,rebuilt and reshimmed head and new rings. in fact a full rebuild bar a rebore which i didnt need, and any luck running like a sewing machine,if it aint someone wont et paid lol Link to comment Share on other sites More sharing options...
chilli Posted April 5, 2006 Share Posted April 5, 2006 wow seems like a quick turn around, do you mind me asking how much it cost and who did it, sounds like a potentially good place to know about in the case of an emergency like this... Hope the car is all sweet when you pick it up, bet you are keen to get it back! Link to comment Share on other sites More sharing options...
cookci Posted October 2, 2007 Share Posted October 2, 2007 sorry to bring this back up but there is a lad on the celicaclub that has having problems with his bottom end! Is it possible that very very old oil could cause problems like this? Link to comment Share on other sites More sharing options...
TLicense Posted October 2, 2007 Share Posted October 2, 2007 I would say very low oil. Link to comment Share on other sites More sharing options...
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