rossman Posted June 28, 2009 Share Posted June 28, 2009 I have a used Trust 50mm wastegate that I think needs to be rebuilt. The diaphragm looks to be in good shape but the valve as some radial play in the valve guide. The valve guide looks simple to replace but I can't find anyone on the web who sells parts for it (besides diaphragms and springs). What type of material do they use for this application? Is it worth trying to have it rebuilt or should I just get a new one? Quote Link to comment Share on other sites More sharing options...
rossman Posted July 4, 2009 Author Share Posted July 4, 2009 Nobody? I took it to a local shop and he is going to try to match up a valve guide for it. The bushing in it is a goldish color so I'm thinking it's bronze similar to engine valve guides. I'm not sure how this is going to hold up in this non-lubricated high temperature environment. Quote Link to comment Share on other sites More sharing options...
big-phil Posted December 9, 2009 Share Posted December 9, 2009 did this ever work? Quote Link to comment Share on other sites More sharing options...
rossman Posted December 9, 2009 Author Share Posted December 9, 2009 I think so, but it's not running yet so I don't know for sure. The shop made a custom aluminum bronze bushing for it. It feels like a nice tight fit. I can wobble the valve ever so slightly in the bushing. As I understand it, there is a sweet spot for the valve stem to guide bushing clearance. Too much and it will leak, too little and it will bind. I believe the right numbers are .003 - .006 clearance. Quote Link to comment Share on other sites More sharing options...
24OZ Posted December 9, 2009 Share Posted December 9, 2009 Would be cool to see pics. Quote Link to comment Share on other sites More sharing options...
rossman Posted December 9, 2009 Author Share Posted December 9, 2009 Hmmm, I thought I had some in my build page. I'm out of town right now Dayton, OH. I'll try to get some pictures when I get back next week. Quote Link to comment Share on other sites More sharing options...
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