Samurai 20V Posted May 26, 2011 Share Posted May 26, 2011 Hi.. So my 2JZGTE motor is starting to show signs of worn valve stem seals, there is a slight puff of blue smoke on start up, somedays it throws out a bit more, but not huge plumes.. If I just leave it alone, what is the effect to the motor in the long run? If I do decide to overhaul, I would probably take the head off. Is it recommended to renew the rings and bearings at the same time, or no need just leave it alone? Any other items that should be changed whilst the head is out? Thanks. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 26, 2011 Share Posted May 26, 2011 Other than the annoyance of lots of smoke it wont damage the engine as it gets burnt off. If you were to change the rings and bearings you would need to pull the engine out, but unless you have problems with compression, oil consumption etc or plan to run big power the stock rings and bearings will be fine Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 26, 2011 Share Posted May 26, 2011 I'd get a compression and leak down test done first, if there good then no real need to take the head off and you can change the stem seals either using the rope trick or compressed air method. I'd think over a long period of time you could get a bigger carbon build up if their not changed. As said above if you want to change rings and bearings then you need to remove the engine and then your into stripping it totally so might as well fit new oil pump etc etc Quote Link to comment Share on other sites More sharing options...
marc_p Posted May 26, 2011 Share Posted May 26, 2011 It will get worse though, I left mine for a while and then it started smoking on idle when the oil was hot and also when setting off. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted May 26, 2011 Author Share Posted May 26, 2011 I'd get a compression and leak down test done first, if there good then no real need to take the head off and you can change the stem seals either using the rope trick or compressed air method. I'd think over a long period of time you could get a bigger carbon build up if their not changed. As said above if you want to change rings and bearings then you need to remove the engine and then your into stripping it totally so might as well fit new oil pump etc etc I think thats a good idea... If the rings are sealing properly might as well leave the assembly alone and change the seals in place. For now it is not annoying me, but if it does start to get worse the I would look to replace the seals.... If I do decide to take the head off then I would decide to freshen up the bottom end and most likely do a turbo upgrade at the same time.... Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted May 26, 2011 Author Share Posted May 26, 2011 It will get worse though, I left mine for a while and then it started smoking on idle when the oil was hot and also when setting off. Not there as yet, if it does get that bad then I would definitely change the seals... Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 26, 2011 Share Posted May 26, 2011 (edited) I think thats a good idea... If the rings are sealing properly might as well leave the assembly alone and change the seals in place. For now it is not annoying me, but if it does start to get worse the I would look to replace the seals.... If I do decide to take the head off then I would decide to freshen up the bottom end and most likely do a turbo upgrade at the same time.... My car was running fine in every way so i decided if the test results were good i'd leave well alone and just replace the seals with the head on which is what i did as the results were very good so no need to touch If there not then i'd pull the engine and do a full rebuild inc the turbos Or drop a built motor in there Edited May 26, 2011 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted May 26, 2011 Author Share Posted May 26, 2011 My car was running fine in every way so i decided if the test results were good i'd leave well alone and just replace the seals with the head on which is what i did as the results were very good so no need to touch If there not then i'd pull the engine and do a full rebuild inc the turbos Or drop a built motor in there Yeah, I think thats the best idea.. Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 26, 2011 Share Posted May 26, 2011 Yeah, I think thats the best idea.. I should of added if your numbers arent great then the leakdown test should pin point where the problem lies be it, inlet valves, exhaust valves or cylinder bores/piston rings. If it showed to be valve leakage then you could just take the head off and get it rebuilt saving you the expense of a full engine out job. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted May 26, 2011 Author Share Posted May 26, 2011 I should of added if your numbers arent great then the leakdown test should pin point where the problem lies be it, inlet valves, exhaust valves or cylinder bores/piston rings. If it showed to be valve leakage then you could just take the head off and get it rebuilt saving you the expense of a full engine out job. Good point... Quote Link to comment Share on other sites More sharing options...
supra_si Posted June 28, 2011 Share Posted June 28, 2011 hmmm is it an expensive job getting the head and valves sorted? sometimes im a little embarassed with a bit of blue when starting from cold now and again Quote Link to comment Share on other sites More sharing options...
Josh Posted June 28, 2011 Share Posted June 28, 2011 hmmm is it an expensive job getting the head and valves sorted? sometimes im a little embarassed with a bit of blue when starting from cold now and again I think someone was quoted about £1,000 to have them changed. I'd opt to do it myself and just take my time over it.. Quote Link to comment Share on other sites More sharing options...
caseys Posted June 28, 2011 Share Posted June 28, 2011 My experience. Mine was getting akin to Mark P's, a huge puff on startup, a puff whenever I pulled away. Good pictures there of the carbon build up. http://www.mkivsupra.net/vbb/showthread.php?191906-Head-Valve-work Quote Link to comment Share on other sites More sharing options...
supra_si Posted June 28, 2011 Share Posted June 28, 2011 a grand..... blimey Quote Link to comment Share on other sites More sharing options...
caseys Posted June 28, 2011 Share Posted June 28, 2011 a grand..... blimey This is one of the jobs though that people balk at, just like refreshing suspension arms - lots of cost where you can't put a bhp figure against. It's a maintenance job for quite a while, but as said if you've got badly coked exhaust valves, one bit flying off could knacker your turbo/turbos one day. Quote Link to comment Share on other sites More sharing options...
supra_si Posted June 28, 2011 Share Posted June 28, 2011 id best get a side kitty saving alongside the wedding fund Quote Link to comment Share on other sites More sharing options...
Josh Posted June 28, 2011 Share Posted June 28, 2011 id best get a side kitty saving alongside the wedding fund Just buy the kit for £100 and do it yourself Quote Link to comment Share on other sites More sharing options...
pezzler Posted June 28, 2011 Share Posted June 28, 2011 Just buy the kit for £100 and do it yourself Or save your £100 to go towards one of these: http://whifbitzperformancetuning.co.uk/toyota-supra-supra-engine-components-cylinder-head-components-garage-whifbitz-p-5855.html Quote Link to comment Share on other sites More sharing options...
Josh Posted June 28, 2011 Share Posted June 28, 2011 Or save your £100 to go towards one of these: http://whifbitzperformancetuning.co.uk/toyota-supra-supra-engine-components-cylinder-head-components-garage-whifbitz-p-5855.html There you go. Perfect. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted June 30, 2011 Share Posted June 30, 2011 Or save your £100 to go towards one of these: http://whifbitzperformancetuning.co.uk/toyota-supra-supra-engine-components-cylinder-head-components-garage-whifbitz-p-5855.html Wow thats cheap; I was quoted 2k sterling to get it done with an oil and water pump (i supply the parts) Quote Link to comment Share on other sites More sharing options...
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