M20B25 Harmonic Balancer/Vibration Dampener

[reggid]

How many different types of Harmonic Balancers/Vibration Dampeners are fitted to M20B25? What are the physical differences between them? Are they interchangable? I am rebuilding an M20B25 engine an want to know what to look out for.

Cheers

[Templ8e30]

I take you're talking about the rubber damped pulley on the front of the crank ?

If so there's 2 types and they are not interchangeable, the later motronic type has teeth around the edge and the earlier jetronic type doesn't.

Cheers,

Iain T

[reggid]

Yes, the one on the front of the crank.

Don't all the M20B25 use motronic? There is supposed to be different types for the M20B25's, even the eta's use a different harmonic balancer than the i's do. The later M20B20 use the same as the later M20B25's though. I need to know what the differences are between the ones used on an M20B25 motor.

Thanks

[bottlecapE30]

one has teeth on it and the other is smooth i think it differs based on the version of motronic you have 1.0 has smooth and 1.3 has teeth (i think). the etas have no teeth

[reggid]

So what i have so far is

- all M20B25 harmonic balancers with teeth are the same.
- The eta have no teeth (apart from the US super eta which has teeth but a different pulley size)