Duramax Diesels Forum Truck of the Week
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Old 03-12-2018, 07:37 AM
Bdsankey Bdsankey is offline
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Default Oil Pressure Relief Valve Shim

Does anybody have a how-to on shimming the oil pressure relief valve?
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Old 03-12-2018, 07:51 AM
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DAVe3283 DAVe3283 is offline
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Shimming it to open at a higher pressure? These trucks make ridiculous oil pressure on cold startup, I would think if anything you'd want to bore it out to flow more. I know Idaho Rob's truck Max'd Out has an external oil pressure relief because the stock one didn't flow enough.

I haven't heard of anyone doing what you are asking, but I would imagine it is pretty straightforward, just hard to know how much to shim to hit your target pressure.
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