Crankshaft Sprocket

[2002#3]

Which single crankshaft sprocket is used when changing from a two-row to a single-row timing chain?

[TobyB]

the one that fits the M10.  There's only one.

 

You can get the part number from RealOEM if you look for an M10 powered E30.

 

t

 

[2002#3]

Thanks, Toby. 

Am I looking for a sprocket which supports two chains, one for the single-row and one for the oil pump (Photo 1)? 

I have been (erroneously) looking for a sprocket that supports a single lonely chain (Photo 2) (that's all I see in parts diagrams).  I guess it's important to turn the OP, too.  It's this damn CovID.

 

 

 

[tech71]

Double row on left, single row on right

What ever that is in your pic 1 does not look right

Edited November 28, 2023 by tech71

[Son of Marty]

It would be the one used on the 1.8l e21's. Unless you need a new sprocket you can run the double chain one and leave one row unused.

Edited November 28, 2023 by Son of Marty

[2002#3]

Thanks, Tech and Son.  The photo and guidance to the 1.8 L did the trick.  You have helped me and my CovID.

[TobyB]

Oh, yeah- if you found a truly one- sprocket sprocket, you'd have to run an external oil pump.

 

Which is overkill for 99.97% of the cars out there.

 

t

[NickVyse]

12 hours ago, Son of Marty said:

It would be the one used on the 1.8l e21's. Unless you need a new sprocket you can run the double chain one and leave one row unused.

 

didn't know you could do that, good info

[2002#3]

Thanks, guys.  Parts ordered.  Moving along...