MKTurbo Sale Thread
#1866
If the valve face will not seat flat on the turbine face, it's likely one or a combination of these:
- binding in the mechanism, valve, swing arm or actuator
- actuator adjustment keeping the valve from closing fully
- incorrect geometry in the assembly
The simplest thing to do is pickup a t3 eBay turbo internal wastegate assembly/housing as a replacement and reference. I've seen them on eBay for cheap and wouldn't be surprised if there are some members here with spares given the failures reported.
- binding in the mechanism, valve, swing arm or actuator
- actuator adjustment keeping the valve from closing fully
- incorrect geometry in the assembly
The simplest thing to do is pickup a t3 eBay turbo internal wastegate assembly/housing as a replacement and reference. I've seen them on eBay for cheap and wouldn't be surprised if there are some members here with spares given the failures reported.
#1867
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When I was inadvertently running too retarded timing in boost the EGTs cooked the flapper shaft and caused it to hang up and not close or open fully. And it wasn't consistent. Shaft ended up like a worm instead of a straight rod. May or may not be the problem but worth mentioning for the broader audience.
#1869
No plexiglass but setting it on my glass table showed me that the wastegate housing isn't actually flat. If I were to deck it I think it would bring the flapper even further from sitting flat. So I'm just going to buy another one and hopefully call it a day. Thanks for all the help guys it's much appreciated. I'm getting pretty close to finally slapping this th
ing on the car.
ing on the car.
#1872
Figured I'd snap a picture of the actual problem before heading out.
When the flapper is sitting flat.
Spencer being a huge help
p.s using the in house uploader for pictures on mobile so I'm unsure of the picture size. Let me know if they're obnoxiously large or a problem.
Edit: Found a nick that was causing the housing not to sit flat as I mentioned earlier. That is not affecting the the housing in the picture.
When the flapper is sitting flat.
Spencer being a huge help
p.s using the in house uploader for pictures on mobile so I'm unsure of the picture size. Let me know if they're obnoxiously large or a problem.
Edit: Found a nick that was causing the housing not to sit flat as I mentioned earlier. That is not affecting the the housing in the picture.
#1877
planning on porting the turbo on my MK kit, put a little smear of grease on the wastegate flapper, bolted it on and moved it so the flapper would make contact (had the lever held back with rubber band until I had it bolted together), this is what I see, is this going to be a problem? it looks quite a bit off, and on that one side it looks like it's not even sealing all the way
#1878
Originally Posted by ditch
planning on porting the turbo on my MK kit, put a little smear of grease on the wastegate flapper, bolted it on and moved it so the flapper would make contact (had the lever held back with rubber band until I had it bolted together), this is what I see, is this going to be a problem? it looks quite a bit off, and on that one side it looks like it's not even sealing all the way
#1879
thank you for the reply. there is about 1-2mm of play, I did this test a couple times, the picture above is with me pulling the flapper such that it was as far towards the untouched side as possible, so this picture is the best it gets, other way it will be 1-2mm further up from the non-touched part. I can't believe it's so far off, seems like a major screw up on those who machined this thing
#1880
Originally Posted by ditch
there is about 1-2mm of play, I did this test a couple times, the picture above is with me pulling the flapper such that it was as far towards the untouched side as possible, so this picture is the best it gets, other way it will be 1-2mm further up from the non-touched part. I can't believe it's so far off, seems like a major screw up on those who machined this thing