Monday, May 16, 2011

Engine Wiring Done

I spent quite a few hours redoing part of the electrical system and wiring up the M42's connectors. First, I replaced the battery cable with an E30 cable. It works with the M42's wiring harness and the E30s had a really cool positive power distribution block. I mounted it where it was in the E30; on the passenger's side of the firewall. If I were to guess, I'd say that BMW's engineers calculated the necessary size of cable to handle the voltage load with a healthy margin of error, and then they doubled it. It's gauge "00". I've seen lightning protection systems with smaller gauge wire.

Here it is mounted in the neat little E30 holder.

The cable has a post on the end of it, and the engine wiring harness attaches to it with a standard battery terminal. The copper eye and cable supply the chassis positive circuit. Here it is with the cover.

Tidy and protected from the random grounding through and errant wrench.

Now, on to the less than tidy wiring in the car. I installed the positive power distribution block from a fourth generation Volkswagen Jetta. This thing is pretty great for safely and easily powering to everything that you need to power and leaving you with the option for future expansion. There are even three fused outputs with a built-in waterproof connector.

It too has a neat little cover.

I did have to drill two holes in it with some spacers and bolts to mount it. Overall, it is definitely worth pulling out of a salvage yard, though I got mine on eBay.

And, lastly, I wired up the C101 connector, which neatly houses all of the connections from the M42 to the chassis. Only six or seven connections need to be made here, and it was a lot easier than I thought it would be. The connectors between the chassis and engine harnesses also have a nice little firewall mount. The big round one on the right with the cap is the diagnostic port. You can also see that I connected the fuel feed and return lines to the engine. 

Left to do:

Wire the electric fan
Wire and install the fuel pump
Install the fuel filter
Bleed brakes
Install and adjust emergency brake
Torque down axle nuts
Add coolant, transmission fluid and engine oil to the appropriate places
Install AFM box and air filter
Finish and install electronic speedometer
Install driveshaft speed sensor
Install Coil-On-Plug kit
Drive like the wind

One more thing: I was and am determined not to modify or grind down the steering center link, though there is  an interference with the M42's transmission. I decided (on Marshall's advice) to do all the clearancing on the transmission, so Dudley grinded away a section of the transmission's ribs and I documented it in an earlier post. As it turns out, Dudley and I needed to take out a bit more once the transmission and engine were mounted properly. Here is the proper amount of clearancing that is needed. Just be careful not to grind yourself a new drain.

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