Thanks a lot Rog. I just unscrewed the front of the ARV and found nothing behind it.

There was a diaphragm there supposedly? It appears to have been removed completely.

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Interesting. Yes, there should be a plunger and spring, with a diaphragm. I would think you'd want to have it stuck closed rather than open (removed), since it would be recirculating pressure out of the intake manifold and back into the turbo inlet. Some have reported that this drastically reduces the amount of boost that can build, since it's normally matched by an equal-ish amount of exhaust gas from the EGR.

Does it seem like the oil was coming from there (via the valve cover vent)?

-Rog

It could be oil vented into the turbo spitting out of the compressor housing ARV port. Find a 12mm or so freeze plug to cover the ARV port. Make sure the ARV cover is properly sealed or you'll draw unfiltered air into the compressor.

Sixto
83 300SD

Funny how there always seems to be an echo in here.

Was there a gasket between the ARV housing and its cover? If not then that's definitely the culprit as there should be. You can make one out of cereal box card, once you find a way to plug the ARV inside of course.

-Rog

My problem is I start a reply then put off posting

Sixto
83 300SD

Thanks for the advice guys i will figure out a good way to plug the hole and ensure there is a good seal on the arv.

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