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Discussion Starter · #1 ·
Today plastic fitting of the upper radiator hose on my 2009 535xi (N54) disintegrated so I had to replace that. Last year I removed a hose from the cylinder head on that car and the mickey mouse style fitting disintegrated and left pieces in the head. When I replaced the hard coolant pipes on my 325i E46 last year they also broke off in the head. I wish they could have found a plastic that could stand up to time better. Still using the original rad hoses on my E46 and they look/feel fantastic still.
 

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plastic fitting of the upper radiator hose on my 2009 535xi (N54) disintegrated so I had to replace that
What disintegrated? The O-ring keeper plastic ring fell off the hose connector? The is a typical result when people didn't use brake grease lube on the O-ring and the male connector when put them together, and the rubber O-ring was bonded to the male part, then the owner try to force them out during removal and crack/separate the plastic keeper ring from the connector body.
 

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2001 325i Sedan
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Today plastic fitting of the upper radiator hose on my 2009 535xi (N54) disintegrated so I had to replace that.
I have a 2007 N54, and I agree 100%. The plastics, ALL of them, on the E90 are vastly inferior to those on the E46. Every bloody time I work on the engine, at least one plastic part breaks, no matter how careful I am. A lot of them have been replaced already. Except for hoses, all the plastics on my E46 are original, intact, and still almost like new.
 

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E30M3 Race F10 535 R1150Rt M Coupe
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What disintegrated? The O-ring keeper plastic ring fell off the hose connector? The is a typical result when people didn't use brake grease lube on the O-ring and the male connector when put them together, and the rubber O-ring was bonded to the male part, then the owner try to force them out during removal and crack/separate the plastic keeper ring from the connector body.
The inner part of the hose connector, just behind the O Ring usually stays stuck onto either the radiator or the OFH outlet. See it all the time. Factory hose never touched (N54/55) from the factory.
It's part of our quote for the OFHG (2 of them) job.
 

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Discussion Starter · #5 ·
What disintegrated? The O-ring keeper plastic ring fell off the hose connector? The is a typical result when people didn't use brake grease lube on the O-ring and the male connector when put them together, and the rubber O-ring was bonded to the male part, then the owner try to force them out during removal and crack/separate the plastic keeper ring from the connector body.
The flange that the hose slips over broke in half. There was only about 1/4" of flange left to slide the hose back on to but not enough for a hose clamp to grab it on to. The o-ring and part that fits into the oil cooler was fine. When the hose came off the crimped ring on the hose was fine and inside the hose was a round plastic piece from the flange that stayed in the hose, under that crimp.
 

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The flange that the hose slips over broke in half. There was only about 1/4" of flange left to slide the hose back on to but not enough for a hose clamp to grab it on to. The o-ring and part that fits into the oil cooler was fine. When the hose came off the crimped ring on the hose was fine and inside the hose was a round plastic piece from the flange that stayed in the hose, under that crimp.
I have never seen the hose broke off from the connector as you described. The said hose connected to the oil cooler? Never heard of this.
 

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E30M3 Race F10 535 R1150Rt M Coupe
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OFH outlet? Am I missing something here, that the OFH connected to the coolant hose?
The conversation strayed, that was a N55 answer to a N55 situation.
 
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