Thanks for all the information guys. I'll read over the links.The common failure points for the E46 cooling system are not the connection fittings. The coolant expansion tank, in my experience, is a much more common failure point. In my cases, I've had to replace two expansion tanks, radiator and the hard coolant pipes residing under the intake manifold. I have never had a failure with the connection fittings of the coolant hoses. Now to be fair, when I replace the coolant expansion tank, I also replace the coolant hoses because I'm there already. I've had my car from 82k (2011) to now 235k
If you're a new E46 owner, there are a couple of links that you may want to read up on:
A list of important threads containing a wealth of information every E46 owner should know, especially if you're new to the car or this forum. Information E46 Wiki Abbreviations and Acronyms Bentley Manual PDF Download RealOEM - Part Number Lookup VIN Lookup Wiring Diagrams Torque Specs Yet...www.e46fanatics.com
The original maintenance schedules were great, but they failed to take into account the effects of age on our cars, especially the rubber bits. After maintaining my car to 200k, and after refreshing 3 more, I came up with this guide. If you are asking "what should I do at xx miles", also ask...www.e46fanatics.com
Edit: I've also had to replace the water pump once and the thermostat once.
You mean just like on the brake master cylinders, and calipers?PSi would prefer 2 Orings.
I am sure you are right but sometimes you look at something safety related and think mmmmYou mean just like on the brake master cylinders, and calipers?
Oh, wait a minute....
Just cause it makes you feel better, does not mean it IS better. To think you know better than the BMW engineers is a bit arrogant. Especially when you clearly have not even done any research to understand what things actually ARE potential problem areas. Going on "feeling", rather than facts, you will spend a whole lot of money, and make your car LESS reliable. My car went >195K miles with NOTHING but normal, scheduled maintenance, a water pump at 125K miles, and a fuel pump at 170K miles. And my experience is not at all unusual for these cars. As I always used to ask all the engineers working for me: Exactly, what problem are you trying to solve?
I have replaced the tank twice and the O rings many times in 40 K miles,thats without all the other leaky cooling bits all now replaced with genune parts where possible and 2 water pumps.Thermostats and o-rings fail quite often. I’ve replace my expansion tank 1 time in 200,000 miles.
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In all calipers, the O-ring sits in the cylinder's groove (same as the hose plastic connector with groove for O-ring) and the piston slides through the O-ring inner diameter. In fact I would say the brake O-ring is not compressed on the movable piston more than the coolant O-ring on the non-moving connector port.The parts the O ring services are a tighter fit from observation on brakes.
It's not an o-ring.In all calipers, the O-ring sits in the cylinder's groove (same as the hose plastic connector with groove for O-ring) and the piston slides through the O-ring inner diameter. In fact I would say the brake O-ring is not compressed on the movable piston more than the coolant O-ring on the non-moving connector port.
And 29 psi max coolant vs hundreds of psi brake fluid, with just rubber O-ring.
Agreed. I should have used the term brake caliper piston seal, but the idea is that to compare the brake O-ring seal and the coolant O-ring, and it is not the tighter fit in the brake vs. looser fit in the coolant design.Semantics. In either vernacular I would not use any typical O Ring composition in a brake caliper seal.