[tacr2man]

well from what you describe , it sounds just what happened to mine,

snapped crank shaft,,,,, yes i know wouldnt belive it too,

drop the sump off and inspect the crank, hope its not this but apparently its a weakness with this engine ,,

good luck

Never heard of that before !

 

[hoboprince]

Hi Guys not heard from garage as yet so don't know what the problem is.

 

[Andrew McIntyre]

Broken timing chain?

 

[FREEL4NDY]

Slipped chain I reckon..... And maybe a few banana shaped valves???

 

[hoboprince]

UPDATE... was told by garage that one of the push rods had broke then shattered but don't know why it broke, (engine done over 150000) so another engine going in.
But is there any way to find out how old the engine is that's going in, the garage says it's out of a same year car but I don't know.

Regards Chas

 

[Singvogel]

well from what you describe , it sounds just what happened to mine,

snapped crank shaft,,,,, yes i know wouldnt belive it too,

drop the sump off and inspect the crank, hope its not this but apparently its a weakness with this engine ,,

good luck

Apparently a weakness?????

I've certainly never heard that before.

I would have reckoned it's pretty unusual.

Must be a couple of million of these M47 engines in use - so statistically there must be a few with a broken crank - but a weakness????

What was the source of this observation?

Singvogel.

 

[hd3]

Apparently a weakness?????

was mentioned a few months back .. regarding snapping cranks ..
off-forum mechanic stated .. 'a known weakness due to water getting in the oil sump'
( that's not a direct quote btw .. just from memory what was written in the thread )

wonder how come the m47r hippo version would be prone to water in the sump
( .. or were it mentioned as all m47r's ? )
i.e. If it is ..
( apart from off-roading-wading ventures ? .. or heavy rain plus not-sealed-properly oil filler cap ? )
anyone heard it mentioned on the mg forum ??

glad i've got zx1 .. that stuff lubricates even with water as a 'carrier'

 

[hd3]

something here about the m47r crank not being as strong as other bmw versions .. m47 n & d ..
( i.e. 'heard' from a bmw mechanic )
Clutch/Solid flywheel option...... [Archive] - MG-Rover.org Forums

2001 bmw 320d .. with snapped crank
Is therover m47 block the same as bmw m47 block? - Yahoo! UK & Ireland Answers

n'other bmw with snapped crank ..
BMW E46 320D - Snapped Crankshaft!!

the hedge cutter thread ..
http://www.landyzone.co.uk/lz/f9/td4-engine-sounds-like-hedge-cutter-182868-4.html

( didn't re-read that LZ thread just now .. can't recall offhand where 'water in sump' was mentioned .. )

uh-oh .. td4/m47r ownership paranoia setting in ..

( now thinking of revising rpm range when driving ..
( reckon too low rpm under load could be potential danger ..
( at least .. that's how older generation diesels would kill crankshafts ..
( no idea how the m47 handles that .. it doesn't feel like it's complaining

think i'll go watch tele news 'n see how the world is falling apart today ..

 

[chris2000]

"you prematurely wish to destroy your transmission and the risk of snapping the crank shaft, this also can be done through chipping, the max torque for the M47R is 260n but the BMW engines the max is 360n"
from the Clutch/Solid flywheel option...... [Archive] - MG-Rover.org Forums link above - Holy cr&£. With my synergy 2 and a heavy right foot that's something else to worry about.

 

[hd3]

just go easy with your right foot .. simplz

'n keep it in perspective ..
i.e. as singvogel wrote :

Must be a couple of million of these M47 engines in use - so statistically there must be a few with a broken crank - but a weakness????

i didn't see many related search results when i googled 'bmw m47r snapped crankshaft'
i.e posted what i saw within the first few pages ..

'n who knows how those engines were maintained .. or driven regarding power and loading ..

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

( edited to add )

re synergy :
see graph at bottom ..
( although not sure if that's related to the td4 ..
( i.e. don't know what the 'tu3' is .. info will be on there somewhere ..
http://tuning-diesels.com/Synergy/Synergy.htm

torque conversion calculator :
http://www.onlineconversion.com/torque.htm

225 pound foot = 305.059 039 2 newton meter

btw : in that thread .. i think they're on about the same engine maybe .. the LR and MG versions were
tuned down compared to the one fitted to bmw cars ..
( so 260 nm max is what the standard hippo version would produce )
and it seems they are more worried about gearboxs / flywheels ..

be a fair few hippo synergy/td4s going strong towing caravans ..

water-in-oil aside .. or possible lack of oil filter changes .. or wrong oil for purpose .. etc etc
i'd say .. when accelerating under load .. don't do it from a too low an rpm .. ..
e.g. pulling a load uphill .. keep rpm above 2000 maybe .. ( at a guess .. to be on the safe side)
above 1750 ( peak torque rpm ) could be fine as well ..

older diesel hgv's would pull between 1750 min to 2150 max ..
under 1750 would be considered 'lugging' and risk of breaking cranks 'n such ..
then later on .. same diesels were being designed to pull safely from 1500 rpm ..
( so needing less gear changes .. 'n potentialy better mpg 'n such
( i think those min. rpm values represented peak torque .. not 100% sure about that ..

i've no idea how lite weight modern car diesels compare to that ..
rpm range is very different .. at least at the higher rpm values

~~~

as for the water-in-oil sump .. theory/story ( whatever it were )
make a drain facility on the 'dish' that surrounds the oil filler cap
( filler lip is about level with dish sides ) .. so in case of .. water ingress after heavy rain
the collected water stands no chance of accidently going down the oil-filler
potentialy due to a inefficient/damaged seal under the filler cap

 

[BigRog]

'one of the push rods had broke'

Push rods for what ?? cant have been valves as its overhead cam - or do they mean con rod, which sounds more likely.

 

[hoboprince]

'one of the push rods had broke'

Push rods for what ?? cant have been valves as its overhead cam - or do they mean con rod, which sounds more likely.

Ah! con rod that's what he said sorry for confusion...

 

[webley2000]

Caused by injector overfueling maybe?
I have seen cracked pistons as a result of this.