
 Originally Posted by 
cuppabillytea
					 
				 
				Hi Mitch. Tombie may be able to enlighten us on this but, I've been told that as the Bearings in the Turbo require high flow, high pressure lubrication to keep them cool, the seals weep a bit and the oil in the charged are system is the result.
 This could be absolute crap that I'm talking here but it has a ring of credibility to me. If it's true, I'd be more worried about the lack of oil than the presence of it.
			
		 
	 
 No, you're right. 
Turbochargers have the compressor (cold) and turbine (Hot) sides, and the CHRA (Centre housing, rotating assembly) joins the two. 
Often they run either ball bearing or journal bearings to link the two sides. It's not clear in the service manual whay bearing system this the puma uses. Journal bearings are particularly interesting as the shaft just slops around until the oil pressure gives it a nice smooth layer to spin on. THere will always be some minute leakage past the seals, but I'd draw the line when oil is pooling in the pipework and 'cooler.
A significant oil leak to the intake via a failed turbo bearing can in some cases, lead to a run-away of the engine- Uncontrolled revs, inability to shut down, plus you get the incredibly fun 5 minutes to watch the engine as it revs itself to death. 
There is some great youtube vids of this if you go looking. 
Puma would more likely than not be protected from run-away by the throttle plate, which would cut air supply in such a situation. In older diesels plugging the inlet air hose or blasting a CO2 fire extinguisher into the engine is a good way to stop it grenading.
As for lack of oil rather than presence of it...
The CHRA is lubricated by engine oil, so if there is none of it at the CHRA, you've probably at best, got oiling issues elsewhere, and at worst, thrown a rod out the side of the engine  
				
			 
			
		 
			
				
			
				
			
			
				-Mitch
'El Burro' 2012 Defender 90.
			
			
		 
	
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