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California98Civic · 07-24-2020, 03:13 PM

Power steering on my daughter's 2006 BMW 325i. I bought a PS Rack rebuild kit for the E90 (from Duralast).

Pictured are 4 O-rings in a row, from left to right: (1) old one, (2) new one, (3) old one, (4) new one. The #3 was the one that leaked and even in this not-great photo you can see that it is partly blown out.

Notice that the old ones appear to have larger diameter and are thinner in thickness. The old ones slid off easily and their inner diameter was basically the same as the fitting they were on. So, ...

Question: knowing all that, is it reasonable to assume the old ones have stretched and hardnened through years of heat cycles and that the new ones are appropriate and will work? In other words, I can stretch the new ones into place, yes? Or should I go to a supply shop I know and hope I can get in (COVID) and find a closer diameter/thickness match?

I am inexperienced with power steering systems. Thanks for all your assistance, friends!

07-24-2020, 03:13 PM	#1 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,174 Times in 1,470 Posts	Assist a repair decision? Power steering on my daughter's 2006 BMW 325i. I bought a PS Rack rebuild kit for the E90 (from Duralast). Pictured are 4 O-rings in a row, from left to right: (1) old one, (2) new one, (3) old one, (4) new one. The #3 was the one that leaked and even in this not-great photo you can see that it is partly blown out. Notice that the old ones appear to have larger diameter and are thinner in thickness. The old ones slid off easily and their inner diameter was basically the same as the fitting they were on. So, ... Question: knowing all that, is it reasonable to assume the old ones have stretched and hardnened through years of heat cycles and that the new ones are appropriate and will work? In other words, I can stretch the new ones into place, yes? Or should I go to a supply shop I know and hope I can get in (COVID) and find a closer diameter/thickness match? I am inexperienced with power steering systems. Thanks for all your assistance, friends! Attached Thumbnails __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.