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			#1  
			
			
			
			
			
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				Power steering return line
			 
			
			I need to replace the low pressure return line.  Does anyone know if this is Special size or a typical 3/8.
			
				
			
		 
				__________________ 1996 E300D | 
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			#2  
			
			
			
			
			
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			It should be a standard size but probably not 3/8 inch, perhaps the metric equivalent of 3/8 inch?
			
				
			
		 
				__________________  "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 | 
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			#3  
			
			
			
			
			
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			Guess that would 9.5 mm
			
				
			
		 
				__________________ 1996 E300D | 
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			#4  
			
			
			
			
			
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			I'm trying to build a custom high-pressure hose. My measurements of the pressure hose are ID = 9.43 mm so that would be close enough; you should be able to use 3/8 inch hose.
			
				
			
		 
				__________________  "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 | 
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			#5  
			
			
			
			
			
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 Awesome, thank you so much! 
				__________________ 1996 E300D | 
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			#6  
			
			
			
			
			
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			Autozone Sells the 3/8" Power Steering Return Hose by the foot and some stores Sell it in a plastic bag with 2 or 3 feet of Hose. Power Steering Return Hose Specification SAE J189 http://standards.sae.org/j189_200306/ . 
				__________________ 84 300D, 82 Volvo 244Gl Diesel | 
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			#7  
			
			
			
			
			
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			For PS return hose, Gates Lock - On or the Dayco equivalent works fine.  Transmission cooler hose works too. There is some really thick wall stuff that doesn't seal so well so I avoid that. Standard fuel hose will work in a pinch though long term it will deteriorate, the lined barrier hose may have a better chance. I used 3/8" Gates Lock-On hose for my thermostat hsg bleed to coolant pressure tank and it clamped just fine. | 
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			#8  
			
			
			
			
			
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			Pretty sure I used 3/8" on my swap, just standard stuff the parts store had. ~13k miles and no leaks. I can attest that air brake line will last less than 2k miles. 
				__________________ 617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap | 
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