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International Automotive Technicians Network
Re: C13 oil pressure issue
Posted to HD/Fleet Forum on 1/11/2021

Sounds like a new pressure relief spring is needed. As a temporary measure, you can shim the old one and raise the pressure. The spring is .600" too short? That is over 1/2 inch (.500).

This is likely due for an in frame bottom end bearing replacement set. Login to read more.