The comprehensive DOHC engine swap thread.

[bzboardz]

I'm doing a 94' m50 into my 90' e30 this summer. I have a pretty decent idea of the parts I am going to need. One thing I am struggling with is the brake booster. I know there is extensive discussion on the booster subject, but I'm tired of looking... People use the 320i or 325ix booster with mods to the shafts and whatnot. I read somewhere that you can use a 944 booster. Is that possible? If so what mods need to be done to the shaft?

IIRC there are two variations of the 944, one is 10mm and other 12mm. either one just needs to be rethreaded

[stender_e30]

I'm doing a 94' m50 into my 90' e30 this summer. I have a pretty decent idea of the parts I am going to need. One thing I am struggling with is the brake booster. I know there is extensive discussion on the booster subject, but I'm tired of looking... People use the 320i or 325ix booster with mods to the shafts and whatnot. I read somewhere that you can use a 944 booster. Is that possible? If so what mods need to be done to the shaft?

[Jalves619]

What is it? Will it blend?

Anybody know what this connector is for? It's in the engine bay and runs into the fusebox but not to any fuses. Wire colors are blue & brown/red into the box where there is a connector. After the connector it leads straight into the interior. Car is a 85 325e which I have the etm for but I haven't been able to figure it out yet. Thanks in advance.

[Jand3rson]

Found the draw, fuse 21 - interior lighting. Kinda strange, since none of the dome lights or anything were on. Pulled the fuse, no more draw. But with that fuse pulled and the key on, all of the dome and dash lights come on. Now just need to figure out why that circuit isn't shutting off.

[Jand3rson]

Yep, that's what we're going to do, I just don't have my own, have to wait until Andrew can come over with his.

This is also kind of good news tho, means my Optima might be just fine afterall.

[Adrian_Visser]

Something somewhere is killing my battery. First did it to my Optima, then to another known good battery, after sitting for about a week. Got in the car just a little while ago to drive it for the first time, and nothing when I turned the key. Not a sound, no lights, absolutely nothing. Something is putting a serious drain on the electrical system and killing batteries dead. Very strange indeed.

Best way to isolate what's doing it would be to hook up a multimeter set to amps in series with the positive terminal of the battery i.e. battery + to + lead of DMM, - lead of DMM to positive battery lead and have a friend watch as you pull fuses one by one until the current draw disappears.

[Jand3rson]

Something somewhere is killing my battery. First did it to my Optima, then to another known good battery, after sitting for about a week. Got in the car just a little while ago to drive it for the first time, and nothing when I turned the key. Not a sound, no lights, absolutely nothing. Something is putting a serious drain on the electrical system and killing batteries dead. Very strange indeed.

[A_Whelan]

Off topic from Jandersons post but I wanted to double check about motor mounts, is this correct? http://www.autopartsway.ca/PartList..../pagenum1/tabS

'87 535i mounts. Thanks.

[HighOnLife]

cant you just use an m20 sensor? I just screwed mine in, or are s50, s52 different?

I did use the M20 sensor there just weren't anymore holes to fit in.

[Wishno87]

cant you just use an m20 sensor? I just screwed mine in, or are s50, s52 different?

OBD2 motors do not have that hole.

[Matt-B]

cant you just use an m20 sensor? I just screwed mine in, or are s50, s52 different?

[HighOnLife]

Just an FYI as I searched this whole thread and a bunch of others about tapping the head for the temp sensor and couldn't find the size to tap.
The size you need is M14X1.5 and we drilled the head with a 29/64" drill bit.
Seemed to work out real well

[Matt-B]

i wonder if you put like 6 quarts in, and take tube out, and trim till it reads right? its possible its an e34 tube, maybe an e36 dipstick.

not sure how different they really are

[etxxz]

1) did you wire the OLS (oil level sensor) right? - static and dynamic.
2) Do you have enough oil. If your dipstick is infact the right one, and installed correctly (not very hard NOT do do) then you should be showing a higher mark. Simple test - add more oil. 7qt is a good #.

I'm actually leaking like crazy from here. Maybe my o-ring is long gone.

[Jand3rson]

As far down as it would go, and still mount to the block. It's in the proper position, tight against the o-ring.