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BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by a naturaly aspirated inline 6 in the 128 or the turbo twin power inline 6 rocket sled 135.

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Old 02-28-2020, 05:25 AM
jaye944's Avatar
jaye944 jaye944 is offline
where da clutch at ?
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complete coolant flush

couple of questions, not sure if I asked this before,

128i 114k (had since 22k, no coolant flush ever done)

* Does doing a complete coolant flush, stop or help to avoid the dreaded water pump failure ?

* Does using anything other than approved BMW coolant or coolant that meets BMW spec, cause or hasten water pump failure

* am I def going to have a water pump failure ? LOL
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Old 02-28-2020, 06:11 AM
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Doug Huffman Doug Huffman is offline
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I do not believe that a coolant flush of the proper coolant causes or prevents a water pump failure. I believe that wrong incompatible coolant anti-corrosion chemicals damage the elastomer seals in the coolant system including the packing of the water pump.

The mechanical water pump is quite conventional except that it does not have an adjustable packing. ALL mechanical water pumps packing seals are lubricated and cooled by the pumped liquid weeping / leaking through the packing.

Bearing life in entirely a matter of load on the bearings.

I'm at ~92K miles and will have the idler pulley bolt recall performed in a few weeks that requires the same access as the WP and I am on the horns of that dilemma. I have no evidence of failing bearings or packing on the existing pump and am loathe to fix / replace what ain't broke and may be the exceptional lifetime water pump. We'll see.

In my work, proper adjustment of mechanical packing was a very contentious issue. We had four 200 Hp multistage 600# discharge pumps from which we collected the leak off water to sell as unmetered bathing water. It was free while everything was fine and 25-cents a gallon while we were on water hours.
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Old 02-28-2020, 08:17 AM
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jaye944 jaye944 is offline
where da clutch at ?
Location: Canada Eh !
 
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"I believe that wrong incompatible coolant anti-corrosion chemicals damage the elastomer seals in the coolant system including the packing of the water pump."

so would that not illicit the notorious failure
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Old 02-28-2020, 04:20 PM
mr_bean mr_bean is offline
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Anecdotally, I've come to the conclusion that water pump failures were common on early N52/N51 engines but are not so common on later builds. I have 125K on mine.
I'm also convinced that "common" failures aren't as common as the stories you read on the internet will lead you to believe.
EX. I have a 2003 R53 which I bought new. According to the internet this is the most unreliable car on the planet. Not mine apparently, it's been pretty reliable.
I had an E46 with 140K on the original cooling system (water pump, radiator, expansion tank, hoses, etc.) This is IMPOSSIBLE if you head over the E46 section of this forum.
I'm not that lucky of a person to be an outlier in these regards.

As for flushing the system, I've read some pretty wonky tech articles on organic acid corrosion inhibitors in automotive coolant (like BMW coolant). It's very different from old school corrosion inhibitors, the electrolytes don't degrade or get consumed over time so there's no real need to flush the system regularly (GM dexcool is an exception).

Last edited by mr_bean; 02-28-2020 at 04:25 PM.
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Old 02-29-2020, 09:37 AM
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jaye944 jaye944 is offline
where da clutch at ?
Location: Canada Eh !
 
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txs mr.bean !
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