M5x Refresh checklist.

[Blaine0002]

Rebuilding my M50B25tu and i figure other people could benefit from the checklist I put together.

If you want to go all out, you should include rods, pistons, piston rings, and bearings in this. Personally i'm only getting a slight bore and oversized pistons.

Let me know how much i missed. Couldn't find all the o rings and other stuff.

https://docs.google.com/spreadsheet/ccc?key=0Avmzv_zxC-JbdHJ0aEpaa3dIWThIaGZlMHNtWUYtN0E

[jrdeamicis]

Just buy the master gasket set - elring. It should have all the gaskets.

So you are going up .025? You could just find your self some 2.8 pistons and or crank. I have a 2.8 block with 90k miles that might be a good starting place for you.

Then you can keep your 84 bore but have a 2.8 Displacement.

How are your cylinder walls? Have you used a bore indicator yet?

[Blaine0002]

Just buy the master gasket set - elring. It should have all the gaskets.

So you are going up .025? You could just find your self some 2.8 pistons and or crank. I have a 2.8 block with 90k miles that might be a good starting place for you.

Then you can keep your 84 bore but have a 2.8 Displacement.

How are your cylinder walls? Have you used a bore indicator yet?

Mostly just refreshing the engine. Slightly oversized set of maxsil pistons so i can bore the cylendar wall. Its an old engine, but im not really looking to boost or stroke. Just looking to get a FRESH M50.

[jrdeamicis]

Mostly just refreshing the engine. Slightly oversized set of maxsil pistons so i can bore the cylendar wall. Its an old engine, but im not really looking to boost or stroke. Just looking to get a FRESH M50.

have you measured the wall yet?

[Blaine0002]

no, im bringing it to the machine shop in the next couple days

[jrdeamicis]

no, im bringing it to the machine shop in the next couple days

Depending on your wall spec you should be able to ball hone and not size up. FFT.


If you wanted to start with a 2.8 let me know, especially if you have it all knocked apart. (it uses the same bore 84mm)

[Blaine0002]

shipping would be a killer i think :( sadly.

As for ball hone, ill bring that up to them when i bring it over there.

[jrdeamicis]

shipping would be a killer i think :( sadly.

As for ball hone, ill bring that up to them when i bring it over there.

Well you don't need the block...

Just rods, pistons, crank. That would not be that bad to ship.

[Blaine0002]

and i already have new pistons :)

[Blaine0002]

any comments? am i missing anything obvious?

[Leo_328i]

Front pulleys should be done whilst the engine is out with new belts too, new water pump with metal impellar as well and aluminium thermostat housing.

[Blaine0002]

Thanks for the info! ill throw these on there.

[Leo_328i]

One other thing you might as well do with the engine out, the oil filter housing gasket which is $3.50 off pelican parts - part number 11 42 1 719 855.

They do eventually leak and its easy to just take it off with the engine out of the car to replace it.