Twin Spark Berlina

[Divano Veloce]

I'm hesitant to reuse the short motor unless I can find the root cause and verify nothing has been damaged. So anything is possible, including 1750 on carbs.... But that would certainly cost more than a replacement ts long motor. A ported high comp motronic ts would be ideal!

[GTVeloce]

I think you should be able to re-use most of the TS bottom end. I doubt there is any issues with the block itself. A set of second hand nord rods in good condition would be very cheap. Get the original crank checked out for balance and condition. New (probably over-size) big end bearings. Have the pistons and liners checked for out of round etc. Then maybe have your pulley checked for balance as well.

Should be fairly cheap; be balanced; have slightly more compression and still have the TS motor. Only potential major problem would be if you need to replace the pistons and liners or crank.

I'm just envious you were able to pull the head off so easily! I'm guessing it has been off not that long ago.

[Divano Veloce]

I was expecting a struggle with the head but absolutely none! Came off with a schling! After the battle i had with the gearbox/motor separation it was a welcome relief.... However I now have four liners that are happy to stay put...

If the crank needs ANY work at all, (and I think it will given no.3 main journal) I think I'll replace it. It has copped several lifetimes of high amplitude and high frequency vibration probably just at Broadford.... 

Are 2L nord cranks exactly the same as TS cranks?

[LaStregaNera]

I vaguely recall the nose being slightly different.
I'd re-use the TS crank - alfa cranks are pretty solidly overbuilt - maybe throw a can of dye-pen at it to check for cracks, but i reckon you'll find it's ok. They're Nitrided, so it's pretty rare that the crank needs re-grinding.

I must have missed it, what's the reason for engine stripdown?

[AikenDrum105]

The nord cranks are a little different on the nose - but there's also a difference on the radius on the edge of the bearing journals. earlier nords have a sharp edge where TS cranks have a 2mm radius.   You have to be careful to check the bearing shells you use are chamfered on the edges to allow for this radius in on a TS crank  (or just chamfer an earlier set with the edge of a steel ruler - thanks Vin...) 

I've been using an earlier 2L nord crank in the last two iterations of the TS in my super.  (because that was the crank I'd tapped grub screws into the galleys on already...   )

Ben's right - the nitrided cranks are super tough... 

[Divano Veloce]

I asked some questions on this thread before moving back to the 105 section

http://www.alfaclubvic.org.au/forum/index.php/topic,14577.15.html

To summarise, severe vibration at higher engine speeds. I suspected main bearings which it wasnt but with sump off noticed leaks at no.1 and no.2 liners. This and a few other things makes me suspect the front end of the crank has been getting very excited.

In the next couple of days hopefully i'll get some time to machine a mandrel to assess the balance on the pulley. On my lunch break yesterday I machined myself a liner remover.

[17fitty]

See you have rust repair sills for your berlina-?i am wondering if anyone out there know of anyone making/selling rust repair panels for berlinas?

[AikenDrum105]

Re the vibration,  I read your other thread about the pulley.    I've removed the extra grooves from a couple of pulleys now, but I cut them off with an angle grinder and then faced them in a lathe to clean it up.  A friend of mine did it with a hacksaw, neatly, and his doesn't have any vibration issues. 

If you get it all back together and still have an issue - you're welcome to borrow my pulley to test - the super's TS is coming out for new pistons

Does the nose of the crank run true ?   I have seen one bent a tiny bit from careless shipping of an engine....   

[Divano Veloce]

click on the image for a short video of the pulley spinning in a lathe

[AikenDrum105]

That's certainly not going to help

[LaStregaNera]

Erm, yeah, that's not ideal!