White smoke and heavy vibration - 1.4 tdi ATL

DuncanA2

Member
Don't forget the difference in compression ratio between the AMF/BHC and ATL. I believe there are three headgaskets to choose from and marked at the tab. Verifiy which one is used for future referrence.
 

RAB

Technical Specialist 1.2 TDI
Definitely no turbo bits ingested, it broke off exhaust end and made quite a chunky indent on exhaust end housing though, intake side was in one piece with no broken fins.
If the exhaust end failed, fragments can enter the inlet via the EGR. The intercooler would probably prevent fragments entering from the compressor end.

RAB
 

Un4tural

Member
Bit bummed out with this.

If anyone has top half of BHC or AMF I'll be quite interested. Not really sure what involves rebuilding actual cams?

@wetzded@hotmail.com AMF/BHC have higher compression ratio from memory, i believe the 3 different head gaskets are only different in thickness, in case parts were machined?

Will try and plan out a plan of action and source a replacement head, unless there are any shops nearby that are happy to rebuild (SW London) but messaged some and not heard back, so could be closed due to lockdown still.

would rather be 100% sure but I don't see what else it could be other than bent valve, engine runs alright otherwise just wobble as hell.

on the bright side i have been through in and out the engine bay multiple times now, getting to know the A2 quite intimately now :D
 

audifan

A2OC Donor
Can you borescope the piston heads and bores and valve bases? Remove the manifolds to try to see if damage to the upper ends of the valves. You are 100% sure the belts are correctly timed and the belt does not have any damage? My early suggestion for the compression check and other damage to the engine when the turbo failed is looking stronger all the time.
 

Un4tural

Member
Can you borescope the piston heads and bores and valve bases? Remove the manifolds to try to see if damage to the upper ends of the valves. You are 100% sure the belts are correctly timed and the belt does not have any damage? My early suggestion for the compression check and other damage to the engine when the turbo failed is looking stronger all the time.

borescope wont fit through glowplug hole nor injector, really should invest in a better one... It does indeed seem valve is bent or broken, considering havoc top half of my old motor had when timing tensioner bolt snapped off and that pistons seemed to not have a scratch I am hopeful pistons are fine, especially as engine runs just fine as a lawnmower twinair? just wobbly.

Timing is definitely spot on.

Will be easier to split the engine and take top off than remove manifolds with engine in car I reckon so will probably go with that, taking top off is just removing the timing belt and then removing some hoses and bolts holding it together...

I remember seeing someone selling ATL near Manchester I think but that was a while ago...

Fun and games, though I might need to get a temporary run about until I finish with the A2.
 
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