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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Dec-18-2017, 05:10:17 PM   #1
JitteryJoe
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Default Engine install and wiring harness question

When I pulled the engine, I first removed the intake manifold and disconnected the wiring harness. Subsequently I ended up removing the engine wiring harness from the car in order to complete some other work. So my question is regarding the easiest way to get the engine back in, the manifold reattached, and the harness attached.

As far as I can tell my options are:

1) Wire the harness to the engine out of the car including installing the intake manifold
2) Wire the harness but leave the intake manifold off until after the engine is seated in the engine bay
3) Install the engine less the intake manifold and wiring harness and do the harness and manifold once engine is back in the car

I was thinking 1 or 2.
For those of you that have actually done this, what do you recommend?

Thanks!
Joe
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Old Mon, Dec-18-2017, 06:57:01 PM   #2
englishtom1596q
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Default Re: Engine install and wiring harness question

Interested to hear this too. I just pulled mine the same way you described and I would rather put it in fully assembled next time. Just don't know where you'd hook the engine hoist up in the back unless you have something holding up the transmission end as it goes in. These are the times a hoist would be nice and lower the car onto the engine and transmission...one day
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Old Mon, Dec-18-2017, 08:12:06 PM   #3
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Default Re: Engine install and wiring harness question

I've always done option #1.
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Old Mon, Dec-18-2017, 08:50:47 PM   #4
JitteryJoe
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Default Re: Engine install and wiring harness question

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Originally Posted by SG_M3 View Post
I've always done option #1.
How do you handle the water outlet at the rear of the head? Can you get to it with the engine in and the manifold hooked up?
Thanks!
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Old Mon, Dec-18-2017, 10:30:43 PM   #5
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Default Re: Engine install and wiring harness question

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Originally Posted by JitteryJoe View Post
How do you handle the water outlet at the rear of the head? Can you get to it with the engine in and the manifold hooked up?
Thanks!
Probably easier to connect the hose to the head side then connect to firewall once in
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Old Mon, Dec-18-2017, 10:52:29 PM   #6
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Default Re: Engine install and wiring harness question

You’ll have plenty of room for either when working in the E46 chassis. With the cabin filter housing off, you can have full range around the motor.

The heater hoses are easily accessed as well, but it wouldn’t hurt to have those already on motor side.

Harness wise, what’s your hoist setup? Front end of the car off?

Intake mani I would do after motor is in.
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Old Tue, Dec-19-2017, 12:28:05 AM   #7
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Default Re: Engine install and wiring harness question

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Originally Posted by PITT M3 RR View Post
You’ll have plenty of room for either when working in the E46 chassis. With the cabin filter housing off, you can have full range around the motor.

The heater hoses are easily accessed as well, but it wouldn’t hurt to have those already on motor side.

Harness wise, what’s your hoist setup? Front end of the car off?

Intake mani I would do after motor is in.
You're in the e36 section....
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Old Tue, Dec-19-2017, 01:11:22 AM   #8
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Default Re: Engine install and wiring harness question

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Originally Posted by englishtom1596q View Post
You're in the e36 section....
Would you look at that. Haha


Well then, for this chassis and an S52, def have harness and intake on prior with blower motor/fire wall cover off.

Also there’s a hole in the rear block for a mount. You can tie off an old seat belt, or just go with a chain. A leveler helps to keep the chains verticle until they’re extended above the motor.
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Old Tue, Dec-19-2017, 01:38:49 AM   #9
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Default Re: Engine install and wiring harness question

It does not much matter. Its a couple of hours added or saved and each way has pros and cons. If you have the front end off the car and are just pushing the engine in, I'd put everything on first. If you have a helper and a hoist, you can guide everything into place. I am usually solo so having a less bulky package is less risk of hitting or pinching something so I usually put the engine in without harness or intake.

I have a lift, and the last time I had the engine out, I dropped the engine and trans out the bottom and lifted the car up and then rolled the drivetrain out. Put it back in the same way. But still left intake and harness off.

If dropping into the bay from above with a hoist, space is also tight with the intake manifold in place and the angled engine block, but if you pull the cowl, you can make more space.

I don't think there is any right way. If you do this work all the time, you probably have a system down. I don't and tend to work slowly.
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Old Tue, Dec-19-2017, 04:18:04 AM   #10
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Default Re: Engine install and wiring harness question

You can see my method in the 98 Journal. Install the engine less the manifold, install the harness, then the manifold. You’re going to get a much cleaner result with easier access to make the wires “pretty”. There’s no stress to have all the ancillaries on either.

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Discussing Engine install and wiring harness question in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)