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  #1  
Old 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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Last edited by E30M42; 12-15-2016 at 12:59 AM.
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Old 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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Old 12-15-2016, 11:50 AM
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If I remember correctly the valve is operated by vacuum. I just fed it boost pressure instead of vacuum and done.
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Old 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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