John McPhee
New Member
disco 4, 6 years old, 93k miles, tdv6 3 ltr, crank shaft broken. Is it common?
myfirstl322
Well-Known Member
Relatively, I believe it's a main bearing design flaw which allows the shells to spin.
That little tangs that locate the shells on every other engine in the entire universe, well PSA decided to un-invent that process.....I think.
That little tangs that locate the shells on every other engine in the entire universe, well PSA decided to un-invent that process.....I think.
jamesmartin
Well-Known Member
if it seizes true but they do stop rotation and seizure from such
myfirstl322
Well-Known Member
dont they have a problem with oil pressure loss?
blue beasty
Leaks an prone to bits dropping off
From the link above the problem is likely to be from batch of incorrectly tensiled cranks that cause the initial wear leading to blocked oilway and catastrophic failure rather than an inherent design flaw.
It's not 'common' as such as the engine is widely used in various vehicles without it being an issue however it's not unheard of and unless other factors are involved it's a manufacturing/quality control problem and whether in warranty not not they should cough up imo
It's not 'common' as such as the engine is widely used in various vehicles without it being an issue however it's not unheard of and unless other factors are involved it's a manufacturing/quality control problem and whether in warranty not not they should cough up imo
myfirstl322
Well-Known Member
Yes it appears that perhaps a batch of cranks were incorrectly hardened, an opinion formed more by dead reckoning than fact, which I'm cool with.
What interested me more was the reference to crush fit main bearings, what are their benefits and have they a pivotal role in cranks being unable to be machined, at least I've heard they can't be ground...?
What interested me more was the reference to crush fit main bearings, what are their benefits and have they a pivotal role in cranks being unable to be machined, at least I've heard they can't be ground...?
Td5 bearings also have no tangs.
When i bought my D3 I joined the D3/4/5 forum and theres some good horror stories on there, initially very few D4 engine issues but Ive noticed over the last year or so they are starting to get some problems, not on the scale of the D3 oil pump fiasco but cranks snapping comes up quite often.
I reckon lots of modern cars issues are caused by extended oil drain intervals, the D3 2.7 and the D4 3.0 only hold 5.5 litres of oil and Iirc can go 15k between changes, thats way to long.
Wifes Audi 3.0tdi holds 8 litres which is much more like it.
When i bought my D3 I joined the D3/4/5 forum and theres some good horror stories on there, initially very few D4 engine issues but Ive noticed over the last year or so they are starting to get some problems, not on the scale of the D3 oil pump fiasco but cranks snapping comes up quite often.
I reckon lots of modern cars issues are caused by extended oil drain intervals, the D3 2.7 and the D4 3.0 only hold 5.5 litres of oil and Iirc can go 15k between changes, thats way to long.
Wifes Audi 3.0tdi holds 8 litres which is much more like it.
