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#1
12-14-2016, 10:22 PM
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om603 bypass valve block off
I am currently going through an 87 300d with the om603. I am trying to reduce all possible boost leaks and noticed the the turbo still has an intact bypass valve that is blocked off from the factory and could be a source of a leak being that the rubber diaphragm is 30 years old.
My question is, has anyone removed the diaphragm and spring and installed a block off plate? Is there a block off that is known to fit this particular turbo? I did a little searching and found one made by IPD (Volvo tuning company) and it appears to have similar dimensions to what would be needed for my turbo. https://www.ipdusa.com/products/9880/121158-compressor-bypass-valve-cbv-block-off-plate-s60r-v70r
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13 Years professional Auto Tech ASE Master Tech GM Master Tech Last edited by E30M42; 12-15-2016 at 12:59 AM. 
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#2
12-14-2016, 10:29 PM
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I found a few others the might fit as well
Sleeve style (not bolt-on) - Diverter Valve Block Off for 2.0T FSI Turbo Golf/Jetta/GTI Audi A3 : atpturbo.com BOV Blanking Plate for Borg Warner EFR, KKK and Ecoboost Turbochargers
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13 Years professional Auto Tech ASE Master Tech GM Master Tech
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#4
12-19-2016, 10:27 PM
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Yes the valve is operated by vacuum but I have a feeling the diaphragm is leaking and I want to eliminate all possibility of leaks. I spoke with IPD and got the dimensions and it is nowhere near the size needed. I ended up making my own block off plug out of some round stock 6061 aluminum I had sitting around.
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13 Years professional Auto Tech ASE Master Tech GM Master Tech
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