Help! Is this a M52 Crank?

[hasa]

Well at least the world is "smaller" now, I was very much alive pre-internet and there would have been NO way I was getting a specific crankshaft out of Scotland back then. The part hunt is frustrating but part of the fun of my project (putting a M20B25 stroker into a 1982 E21).

I can hear you, I started building German cars 1994 and back then pretty much all information was hidden. You had to find specific people to talk with. I did lot of stupid mistakes just because the learning curve was so hard. Nowadays you just find from Google or Youtube and everything is there. Misinformation too, and the amount of nosense is remarkable.

[RicardoD]

Well at least the world is "smaller" now, I was very much alive pre-internet and there would have been NO way I was getting a specific crankshaft out of Scotland back then. The part hunt is frustrating but part of the fun of my project (putting a M20B25 stroker into a 1982 E21).

[hasa]

I paid more taxes, tolls and freight than item itself when purchased S50B30US crank from states and imported to Finland😂

[digger]

Thanks Digger,

I sourced one of these Euro 2242898 M52 cranks out of Scotland but I think the freight forwarding shipping cost I paid is equal to any additional block machining cost. I will photograph mine and share on the board when I get a chance. It is from a 1997 BMW E36 2.8 Manual

All the best,
Ricardo

i also use freight forwarders because upsidedown land and yes they are uber $$$ out of the UK

[RicardoD]

Thanks Digger,

I sourced one of these Euro 2242898 M52 cranks out of Scotland but I think the freight forwarding shipping cost I paid is equal to any additional block machining cost. I will photograph mine and share on the board when I get a chance. It is from a 1997 BMW E36 2.8 Manual

All the best,
Ricardo

[digger]

Resurrecting this thread. So the 84mm Euro smaller counterweight crank eliminates the need for clearance machining on the block?

Should do, but clearancing the block is easy as. The bigger issue is clearing the piston skirts but normally only if using OE pistons

[RicardoD]

Resurrecting this thread. So the 84mm Euro smaller counterweight crank eliminates the need for clearance machining on the block?

[ForcedFirebird]

Both cranks look ok for re-using. Both seem to be the C38 crank family that fits into M20 without problems.

84mm crank with integrated triggerwheel does not turn freely in M20B25 block (without modifications).

Depends on what they cam out of. Outside the US, you guys have more options than we do. The early Euro m52 had the crank reluctor in the front (OBDII was only mandated in the US in 1996) - the Euro crank has shorter throws. In fact, Euro cranks clear late model short skirt pistons. The m54 (and m52tu) cranks have narrower throws that are larger in diameter, resulting in a lighter crank with more interference in an m20...

https://www.r3vlimited.com/board/for...ks#post9934671

[hasa]

Both cranks look ok for re-using. Both seem to be the C38 crank family that fits into M20 without problems.

84mm crank with integrated triggerwheel does not turn freely in M20B25 block (without modifications).

[digger]

there are different versions it looks like your Crank A does not have the moninting for trigger wheel so this might be the smaller counterweight version which is the one to use

[shawshankNG]

Looks like the most popular M52 2.8L crankshaft casting numbers are:
1) 1432277
2) 2242898
Although there is a diesel M51D25 and S50 2.5L engine crankshaft with this same 2242898 casting number so you probably need to ask what engine the crank came from if you find one with this number.

Now to my question. I got two M52B28 single VANOS engines with the following block ID stamps and crankshaft numbers:

Engine A:
31358497
28 6S 1
2242898, C38 (crankshaft cast numbers)

Engine B:
33851209
28 6S 1
1439413, NC38 (crankshaft cast numbers)

I have not come across this second 1439413 casting number anywhere on the internet and it does have some physical differences with the popular 2242898 one pictured side by side here. I am 100% sure this is from a 2.8L M52 single VANOS because I removed them myself on the same day.

Question 1: Is it possible for the counterweights to be different in shape/placement but have the same 84mm stroke?

Question 2: Is the condition of the first crankshaft good enough to reuse?


Engine A block


Engine B block


Engine A crankshaft


Engine B crankshaft

Both crankshafts side by side. 2242898 on top.

[hasa]

I had to turn some amount off from the counterweights when installing a 84mm M52B28TU crank to M20 block. Counterweights touched block and pistons. And of course crank needed balancing after machining.

[shawshankNG]

I think 323 was a typo on his part

here is1432277 crank, 84mm stroke

I love this forum.

[digger]

Hello all! I have been struggling to buy a E36 M52B28 crank.

I have found two options of E46 M52B28 TU crank. Will that work for my M20? It should be a direct swap from my understanding, but I just wanted to get expert opinion before I go ahead and buy a motor to swap the parts from.

Thank you all in advance!

Yes it does work but some mods are required possibly depending what rods and Pistons

[zaq123]

e34 528i? Also, wasn't the e46 323 a 2.5l?

I bet members here wouldn't mind if you shared said spreadsheet. ;)

I think 323 was a typo on his part

here is1432277 crank, 84mm stroke