2.5 tdi ANJ crankshaft broken

[pasbogdan]

I was very proud of my 2003 vw lt that it has 700.000km on clock without opening engine,factory turbo.
But desaster strikes:
Crakn broken on the nr 1 bigend.No oil starvation,bearings not hot,only damage of the running engine with broken crank.
It was the front pulley that was wobbleing since a fiew month?
Or it was time
I will open it and see how bores look,will make a rebuild to last another 500.000
No oil deposits in 700.000 km.Look how clean all is.

[campbellWS]

wow!!!! how the heck does a crank break like that

[pasbogdan]

I think wobly front pulley did that.Will a rigid one with no xucking ruber be ok for the hidraulic tensioner?

[UrS4boy]

wow!!!! how the heck does a crank break like that

If you followed some of the links about the harmonic balancer you will find that there are stories about two engines on a test bed, one with a harmonic balancer and one without. Both rev'd to something like 5000 or 6000 RPM. The one without the harmonic balancer lasted only minutes.

Bottomline: Missing or damaged harmonic balancer/damper = recipe for disaster.

[quattro84]

Nope, looks like normal low cycle fatique looking at the clean fracture surface. Crack originates from the smallest area, at the oil bore hole.

[pasbogdan]

This is a van with tdi so no 5000 6000 rpm needed.All i5 diesel(2.4,2.5)have harmonic?

[UrS4boy]

This is a van with tdi so no 5000 6000 rpm needed.All i5 diesel(2.4,2.5)have harmonic?

I am sure they (all the I5s) have some form of harmonic damper. Here is a failing one from a C4 AAT diesel:

http://forums.quattroworld.com/s4s6/msgs/157639.phtml

[pasbogdan]

Lot of ruber there.Not all have so much.

[rj scotty]

All 5 cylinder engines need some sort of external balancer due to the 2nd and 3rd degree harmonics created

[rj scotty]

I'm replacing mine on the van next cam belt change. I'm on nearly 190000 miles and just done second cambelt change.

I have a bet with a fellow t4 owner: £1000 first to 1 million miles on original engine

looked after these engines should out live you!

[pasbogdan]

I measured main bearings bores with caps tightened and found 0.05-0.07 deviations.Not worth reboring the crank line because i found a perfect bores/main lines AGX sdi block.Do you think material in it will the same?

[pasbogdan]

Visualy(holes etc) and dimensions are the same at 2 blocks.Why are 2 codes?one for anj tdi and one for agx sdi?

[diesel des]

No oil squinters on sdi.?

[ManiacuV6]

I think that the main reason is to make the identification of engine more easy . When you go to make M.O.T ( ITP in Romania) the tehnician will check if you have the engine from the car's paperwork.

[pasbogdan]

Oil sprayers also on sdi.