Failed head Gasket and now sounds like broken shell at bottom end. 635d - Bimmerfest - BMW Forums



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Old 08-07-2019, 10:58 PM
jonnyglash jonnyglash is offline
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Failed head Gasket and now sounds like broken shell at bottom end. 635d

635d 140k miles

Hi people, Iím hoping someone can share a little more light onto this. My head gasket went and I drove car (driving fine) for a good few thousand miles. No faults apart from lots of oil in the coolant to extent of stopping the circulation of the coolant. Had head fixed. Drove 20 miles then very load knocking sound from engine. Sounds like something from bottom end of engine.

Anyone heard of this happening before or reasons why this could happen. I thought maybe it got hot without telling me as coolant not circulating so censer missed it maybe. Where are the thermostats? Is there one on crank? Thanks.


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Old 08-08-2019, 12:42 AM
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Hsurf Hsurf is offline
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I freely admit my knowledge on the diesel is limited so take what I say with a pinch of salt but I don't know of any internal combustion engine that will put up with several thousand miles of running with a blown head gasket, I suspect this could well be a costly affair.
At worst you could be looking at a complete engine rebuild as its surely been running extremely hot given you say the coolant was stopped circulating by the oil within it, it's possible you didn't get any temp warnings because the oil was impeding the thermostat from working correctly, hell it may even be cheaper to get a replacement engine fitted but what's done is done and everything I mention is speculation.
I think you'll need to get it to a indy specialist to find out what the true damage is.
In the mean time here is what I found for the thermostat.

Coolant Thermostat
https://www.newtis.info/tisv2/a/en/e...-lines/FvlPXSI

This on the 5 series but should be the same engine.



I'm not sure if this has been done before on your car but I'll add it anyway as it seems a common failure point and is in the same area.
EGR Thermostat
https://www.newtis.info/tisv2/a/en/e...ation/2StxQxxU

There is a dedicated diesel section here and they may be able to shed some better light on the subject, they'll certainly be more knowledgeable than me .

I do hope for your sake I'm very wrong and your outcome is a cheap one, the diesels are generally pretty bullet proof but you may have asked a bit much of this one.
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Old 08-08-2019, 08:33 AM
jonnyglash jonnyglash is offline
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Thanks very much for all your info. Iíll let you know the outcome .


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Old 08-08-2019, 10:23 AM
karzrus karzrus is online now
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If you had oil going into the coolant, you very likely had coolant going into the oil. This can be confirmed buy the look of the oil when drained for a oil change (Looks like a chocolate milkshake) that should have been done while the head gasket was replaced.
Most likely you damaged one or more of the main and/or connecting rod bearing from lack of proper lubrication.

That knock you hear is the excessive play in one or more of the connecting rod bearings. The motor wonít last long and if driven on far, will result in the connecting rod exiting the side of the block destroying what ever is salvageable of the bottom end for rebuilding.

It was stated in an earlier post, you can not drive far with oil and coolant mixing due to a passing head gasket, cracked head or block without doing a bunch more damage. No need to update, your motor is toast.
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Old 08-08-2019, 01:58 PM
FredoinSF FredoinSF is offline
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Owning an X5 diesel along with the 650, I hang out on the diesel boards.
Head gasket on that that M57 seems to be extremely rare. On other inline 6 like the M54 youíre better off with a new to you used engine as the head gasket fix only holds 50% of the time.


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