oil burning
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A CDR is a crankcase depression regulator. It's similar to a PCV valve on a gas motor. If your truck is non-turbo, it should be located on your intake, just behind the throat. If it's turbo, it should be on your driver side valve cover. It looks like a tuna can. There will be a small hole on one side, if you can blow air(use your mouth, not a compressor) through into the little hole and it comes out the big hole, then the diaphragm is broken. If it's good, then rinse it out with some gas(not diesel) and reinstall it.
The following 2 users liked this post by Sycostang67:
ArizonaRedneck (12-04-2009),
Sawman (12-05-2009)
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