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85 300D (CA) Turbo Boost adjustments

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Old Jan 21, 2010 | 11:06 AM
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Neal Nayman's Avatar
Neal Nayman
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From: Hazel Green, AL
1985 300D, 1992 300D, 1982 300SD
85 300D (CA) Turbo Boost adjustments
Does anyone know of a link for Turbo boost pressure and waste gate adjustments.
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Old Jan 21, 2010 | 04:32 PM
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300Dman
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From: So CA
1984 300D,82 Volvo Diesel
Originally Posted by Neal Nayman
Does anyone know of a link for Turbo boost pressure and waste gate adjustments.
You will need to identify which Turbo You have. Most have Garrett (Air Research) Turbos but some had KKK Turbos.

Don't know if that info is in here:

Repair Links
http://www.peachparts.com/shopforum/forumdisplay.php?f=82

http://www.peachparts.com/Wikka/DoItYourSelf
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Old Jan 22, 2010 | 09:08 AM
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Neal Nayman
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From: Hazel Green, AL
1985 300D, 1992 300D, 1982 300SD
85 300D (CA) Turbo Boost adjustments
Thanks again 300Dman for your response! I check the links out.
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Old Jan 23, 2010 | 01:34 AM
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300Dman
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From: So CA
1984 300D,82 Volvo Diesel
Originally Posted by Neal Nayman
Does anyone know of a link for Turbo boost pressure and waste gate adjustments.
Below is a pic of a Garrett Turbo (Air Research). The spring tension on the Boost Pressure Regulating Valve/Waste Gate appears to be adjustable by way of the Nut indicated by the Red Arrow.
However, I have not read of anyone doing this adjustment.

I have read of folks putting a seperate Boost Control Valve inline with the Boost Control Hose. I hear you can adjust when they open.

Other non-adjustable factors are the clearances of the Compressor and Turbine Wheels in their housings. If there is a lot of clearance it could be possible that the Turbo might not reach the pressure you need yet the Boost Control remains closed.

There is no pic of the Boost Control Valve/Waste Gate of a KKK Turbocharger.
Attached Thumbnails 85 300D (CA) Turbo Boost adjustments-waste-gate-boost-pressure-control-valve.jpg  
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Old Jan 25, 2010 | 04:33 AM
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From: Colorado
1982 300D
Do not adjust pressure above 12psi.
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