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M40b16 to M20B25 swap
Posted: Thu May 11, 2017 5:58 pm
by chri
Hi all I m in the middle of this swap and like to clarify:
Do the M40 316i fuel pump feed the thirsty M20 325i?
Re: M40b16 to M20B25 swap
Posted: Fri May 12, 2017 6:15 am
by jmc330i
Yes, no problem.
Re: M40b16 to M20B25 swap
Posted: Fri May 12, 2017 5:56 pm
by chri
Thanks for the reply jmc
Another question
What are the 2 wires connected to the positive battery terminal?
On the M20 body there are still 2 wires while On the M40 body I ended up with only 1 wire because the other wire comes out with the harness
Re: M40b16 to M20B25 swap
Posted: Sun May 14, 2017 11:56 pm
by Brianmoooore
M20 and M40 should both have at least two wires going to the battery + terminal, in addition to the large cable to the starter motor. One of these feeds the engine wiring loom, and the other is the power feed to the fusebox and ignition switch.
There will be a third wire on cars with ABS, that powers the ABS pump motor.
Re: M40b16 to M20B25 swap
Posted: Mon May 15, 2017 9:01 pm
by chri
The extra wire as brian said was for the abs pump. Now sorted and engine started today and running perfect
love the 6 cylinder melody......
With some help from this forum the swap was a breeze
Thanks guys keep up the good work