Join Date: Sep 2011
Location: littleton, nc
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How freely should turbo spin?
2007 F250 6.0 crew cab, stock, 112,000 miles. Getting turbo underboost DTCs ocassionally.
Pulled turbo, cleaned, and while there was very little 'coke', the unison ring was definitely frozen to the housing.
While cleaning I found it odd that the turbo wheel, when spun with my hand, stops almost immediately. Seemed tight. When using compressed air to clean out after using the 3M cleaning pads, I tried spinning the turbo wheel with the air compressor - could barely get it to turn.
Thought it odd, couldn't help but think it's gonna take a lot of exhaust pressure to spin that thing... but perhaps thats how tight it should be?
Any thoughts? Whats your experience on how freely the wheel should spin?
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