carl0s Posted March 8, 2007 Share Posted March 8, 2007 Can somebody please enlighten me, or give me some links to threads on here or Supraforums which talk about the "common no. 6 problems" that I have heard referred to? I can't search for "no." or "6" because they are too short for our forum's search engine. Link to comment Share on other sites More sharing options...
Ian C Posted March 8, 2007 Share Posted March 8, 2007 Isn't it something to do with it runs hotter as it's at the back of the engine? -Ian Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 Could be. I'm sure I'd heard something before, but I just noticed this: Ok try to do that on a 100,000klm supra, that is suffering like all of them on No.6 and if you don't blow it up from the pressure and the inconcistency then we talk again. Regards Dimitri Link to comment Share on other sites More sharing options...
Ian C Posted March 8, 2007 Share Posted March 8, 2007 That's a little out of context for me to even begin to guess what he's talking about -Ian Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 That's a little out of context for me to even begin to guess what he's talking about -Ian If you click on the little arrow after his name, it'll take you to the thread, but there doesn't seem to be anything else of relevance in there to read. I suppose I should have spoke up in that thread really, but I thought it might be a known weak spot in the engine. I asked because... I noticed some things about my engine when doing the plugs the other week. I suspect it was caused by the breather hoses being broken. They had been split around the ends, and therefore had been fixed in place with zip-ties, done up very tight, but I suspect there was still leakage (of whatever goes through them - air? oily air?) around the split ends. Anyway, near no.6 spark plug was a noticable amount of gunky dusty shit - y'know oily dirt - in the 'valley' between the cams - where the plugs are. I spent some time cleaning it out with engine/machine degreaser, a paint brush, vacuum cleaner etc. (while the plugs were still in of course). Then I took the plugs out, and the thread around the plug was quite oily dirty too. I started thinking "uhh. head gasket problems?" but I carried on and the car runs sweetly anyway, and it of course has new breather hoses and the plugs are torqued up to the correct 13ft/lbs. Anything to worry about do you think? Link to comment Share on other sites More sharing options...
Guest Bijal Posted March 8, 2007 Share Posted March 8, 2007 its simple, the no 6 cylinder will run hotter than the others (sometimes even no 5 cylinder) because its the furthest away from the intake. when it comes to tuning, you can always add a little more fuel in them cylinders to cool them slightly. have you done a compression check or are you just dreading to do one bijal Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 have you done a compression check or are you just dreading to do one bijal Hadn't really thought of doing one. I don't think anything is wrong with the car - was kind of expecting one of you guys to say "yeah, it does get oily in there", or "yeah it'll get a bit oily if the hose has a leak in it". Honestly the car seems fine. But if you think I should do a compression check, then I don't dread the idea at all. I'm a little unsure how to do it though - I'd have to crank the engine over by hand wouldn't I, which surely can't be done without removing belts and what not, can it? Link to comment Share on other sites More sharing options...
JODY T Posted March 8, 2007 Share Posted March 8, 2007 Ive serviced many TTs, it is a common problem, Oil covering the 6th plug... In my experiance the cars still run fine like this.. So nothing to worry about, at least for now... You may find cylinder 6 is a little down on compression also... There are more like this than not IMO... Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 That's what I was hoping to hear then. Thanks guys What of the compression test - straightforward to do or what? I know what the tool looks like and how it works, just not sure how to turn the engine over to get to TDC on the particular cylinder. and the broken hoses - what problems would they have caused? Link to comment Share on other sites More sharing options...
Guest Bijal Posted March 8, 2007 Share Posted March 8, 2007 Hadn't really thought of doing one. I don't think anything is wrong with the car - was kind of expecting one of you guys to say "yeah, it does get oily in there", or "yeah it'll get a bit oily if the hose has a leak in it". Honestly the car seems fine. But if you think I should do a compression check, then I don't dread the idea at all. I'm a little unsure how to do it though - I'd have to crank the engine over by hand wouldn't I, which surely can't be done without removing belts and what not, can it? no harm doing a compression test. its easy and only takes like 10 mins to do it. and no you dont turn the engine manualy, the engine is cranked. i have seen many supras with this problem, i had an 18k miler import supra yesterday and it had the same problem. its more common when the centre breather hoses are broken or not put ack properly. i have also seen it in the no 1 outer side of the plugs but thats just dimwits not using a funnel to fill the oil and drops it a little on the cam covers and goes down the side of the coil packs. just do a check, its easy and you will get an idea on the engine. good luck. bijal Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 no harm doing a compression test. its easy and only takes like 10 mins to do it. and no you dont turn the engine manualy, the engine is cranked. Ah, I see. So the compression tester has a sort of 'peak hold' so you can see what compression was reached, even after the piston carries on back down? Oil spillage. I didn't think of that one I find a small (500ml) coke bottle fits like it was designed for the job of filling with oil. Try it one day thanks Link to comment Share on other sites More sharing options...
Guest Bijal Posted March 8, 2007 Share Posted March 8, 2007 Ah, I see. So the compression tester has a sort of 'peak hold' so you can see what compression was reached, even after the piston carries on back down? Oil spillage. I didn't think of that one I find a small (500ml) coke bottle fits like it was designed for the job of filling with oil. Try it one day thanks good one. the compression tester has a one way valve built in. just turn the engine over until you dont see the gauge going up anymore, record the figure and move onto the next one. if you are running a standalone managment going into the software and swith the injectors off before you do it. if your running the stock ecu then take the efi fuses out before cranking. and also, take all your plugs out before doing the test. simple. bijal Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 Ah, now y'see I wouldn't have thought about pulling the fuses & plugs. I thought I'd just have a spluttering engine Coke bottles are awesome, honestly! Cut the bottom off of course, but the little plastic ring around the collar (the bit that breaks away from the cap when you open for the first time) compresses slightly giving the best fit ever Link to comment Share on other sites More sharing options...
Nic Posted March 8, 2007 Share Posted March 8, 2007 Carl, from your description the oil was on the outside of the engine, between the cam covers where the plugs are, correct? If this is the case it may be just the cam cover gasket that is leaking slightly ie. nothing to do with the no.6 cylinder issue. Link to comment Share on other sites More sharing options...
Tom Posted March 8, 2007 Share Posted March 8, 2007 The uk's have the scoop for cooling these very cylinders don't they? If so I think it's strange that toyota found it necessary just for the uk. Link to comment Share on other sites More sharing options...
Tom Posted March 8, 2007 Share Posted March 8, 2007 Carl, from your description the oil was on the outside of the engine, between the cam covers where the plugs are, correct? If this is the case it may be just the cam cover gasket that is leaking slightly ie. nothing to do with the no.6 cylinder issue. That's a good point, and it should be obvious to spot Carl, no worries if it is, simple job don't attempt on a windy day though Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 8, 2007 Share Posted March 8, 2007 If you click on the little arrow after his name, it'll take you to the thread, but there doesn't seem to be anything else of relevance in there to read. I suppose I should have spoke up in that thread really, but I thought it might be a known weak spot in the engine. I asked because... I noticed some things about my engine when doing the plugs the other week. I suspect it was caused by the breather hoses being broken. They had been split around the ends, and therefore had been fixed in place with zip-ties, done up very tight, but I suspect there was still leakage (of whatever goes through them - air? oily air?) around the split ends. Anyway, near no.6 spark plug was a noticable amount of gunky dusty shit - y'know oily dirt - in the 'valley' between the cams - where the plugs are. I spent some time cleaning it out with engine/machine degreaser, a paint brush, vacuum cleaner etc. (while the plugs were still in of course). Then I took the plugs out, and the thread around the plug was quite oily dirty too. I started thinking "uhh. head gasket problems?" but I carried on and the car runs sweetly anyway, and it of course has new breather hoses and the plugs are torqued up to the correct 13ft/lbs. Anything to worry about do you think? No, nothing to with head gasket, everything to do with cam cover gaskets. re torque all the cam cover bolts, or if you feel flush renew the cam cover seals and re torque. Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 8, 2007 Share Posted March 8, 2007 The uk's have the scoop for cooling these very cylinders don't they? If so I think it's strange that toyota found it necessary just for the uk. An air scoop will have zero effect on in cylinder temps, the UK / US scoop appears to be for cooling the under heat shileld turbo area. Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 8, 2007 Share Posted March 8, 2007 good one. the compression tester has a one way valve built in. just turn the engine over until you dont see the gauge going up anymore, record the figure and move onto the next one. if you are running a standalone managment going into the software and swith the injectors off before you do it. if your running the stock ecu then take the efi fuses out before cranking. and also, take all your plugs out before doing the test. simple. bijal You should do it with the throttle held wide open, to avoid pumping losses. Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 All great help, thanks everyone. I saw the sandwiched gasket, and it is this that I feared, but I didn't know they were the cam cover gaskets. I need to spend more time learning about what's what in an engine I should know what/where the head and its gaskets are - it's not that hard is it I'll re-torque cam cover bolts once I find out the correct torque settings. Super. Thanks again guys. Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 re torque all the cam cover bolts I'm struggling to find some torque ratings for them. All I can see is people saying "they're done up really loose - something like 5.4ft/lbs, which is almost finger tight" and "they break really easily if you do them too tight". Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 8, 2007 Share Posted March 8, 2007 I'm struggling to find some torque ratings for them. All I can see is people saying "they're done up really loose - something like 5.4ft/lbs, which is almost finger tight" and "they break really easily if you do them too tight". I'd say about 7 ft lbs, I just do them to what feels right, but I am good after 35 years of working out what feels right Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 Awesome, thanks Link to comment Share on other sites More sharing options...
carl0s Posted March 8, 2007 Author Share Posted March 8, 2007 Wow. You wouldn't beleive how loose they all were. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted March 8, 2007 Share Posted March 8, 2007 cam covers are leaking..mine does this but as i know what it is i don't worrie about it. Link to comment Share on other sites More sharing options...
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