super_supra Posted December 28, 2009 Share Posted December 28, 2009 I ve just been repiping up the pipe work for the wastegates on my ihi twin turbo set up. When testing for leaks i found, when blowing down the pipe from the turbo compresser to the wastegates one of the wastegates was leaking the pressure in to the exhaust/screamer pipe. i have stripped the wastegate expecting to find a seal that had failed but there is nothing on the plunger shaft, do they just rely on a good fit on the shaft to hold the pressure? I am unsure what the wastegates are they are the ones from this post http://www.mkivsupra.net/vbb/showthread.php?t=147199&highlight=big+ihi+turbo Any help or info will be appreciated cheers Neil Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 28, 2009 Share Posted December 28, 2009 Is there any sign of burning or chips on the valve seat? they are similar to a valve, so need to have a reasonable seat. Link to comment Share on other sites More sharing options...
paul mac Posted December 28, 2009 Share Posted December 28, 2009 Is there any sign of burning or chips on the valve seat? they are similar to a valve, so need to have a reasonable seat. you can use some grinding paste to lap the seat in if it is slightly damaged Link to comment Share on other sites More sharing options...
super_supra Posted December 28, 2009 Author Share Posted December 28, 2009 Thanks for the reply's it is not the valve set bit thats passing it's passing were the valve stem guide is from the diaphram end and out through the screamer pipe bolts on. tryied to show it on this diagram Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 28, 2009 Share Posted December 28, 2009 They never seal completely so in use they will always pass a little air but as its constant when controlling boost you tend to compensate by adjustment, what usually happens with use is that the guide/stem get sealed by carbon/burnt grease, try a little high temp grease on it. Link to comment Share on other sites More sharing options...
super_supra Posted December 29, 2009 Author Share Posted December 29, 2009 They never seal completely so in use they will always pass a little air but as its constant when controlling boost you tend to compensate by adjustment, what usually happens with use is that the guide/stem get sealed by carbon/burnt grease, try a little high temp grease on it. Would coppper grease be ok? if not what would you recomend:search: cheers Neil Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 29, 2009 Share Posted December 29, 2009 Would coppper grease be ok? if not what would you recomend:search: cheers Neil Copper grease is what i use on mine, and it hasn't gummed it up yet, 18 months. Link to comment Share on other sites More sharing options...
super_supra Posted December 29, 2009 Author Share Posted December 29, 2009 I ve rebuild it with a load for grease on the stem and seem's better thanks again for you help Link to comment Share on other sites More sharing options...
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