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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-17-2013, 03:32 PM   #1
JERRYUSMC323i
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What to replace on a used engine.

Okay I am new here and I have a good question been looking through the site and didn't see a question like this so here goes.

I just brought a 1999 BMW 323i with a bad motor for $400 that was caused by over heating. The upper hose bleed screw popped off and toasted the motor. Compression check was no higher than 50psi. I brought a used motor that runs from Bavarian Auto Recycling for $1450. I have pull the old motor out of the car and I am about to install the used motor. I would like to ask what part should I change on the used motor before I install it back in the car so I will not have to do any more major maintenance once its in.

I mean like Oil pan gasket, Rear and Front seals, Cooling System part, Seal on the transmission. I am trying to do as much Maintenance as possible while this motor is out as possible.

Also do I need to take all the senors off the old motor and put them on the new one. Click image for larger version

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Last edited by JERRYUSMC323i; 11-17-2013 at 03:33 PM.
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Old 11-17-2013, 03:39 PM   #2
Encryption76
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Definitely change all of the seals. Less of a headache later. Have a look at the ccv and connecting hoses also and probably figure in changing those too while the engine is out. Have a look into replacing the valve cover gasket and doing a seal job on the vanos too.

Actually, there is quite a bit you could do for that engine before you put it back in that would be really easy with it out that will save you some pain and suffering later. Don't forget to use oem gaskets and seals or you might wind up having to do it again in the near future. Especially the exhaust gaskets.

Last edited by Encryption76; 11-17-2013 at 03:40 PM.
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Old 11-17-2013, 10:36 PM   #3
JERRYUSMC323i
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Thanks Encryption 76! I am ordering parts for the cooling system i know!
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Old 11-17-2013, 11:09 PM   #4
lszlszx
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Looks like a fun project! Auto, or manual? Mileage?
Replace all the vacuum hoses, clean throttle body and idle control valve, new engine mounts.
Sensors should be OK for now, since they're used on both engines.
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Old 11-18-2013, 01:20 AM   #5
Cavi Mike
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Everything that's easy to get to now that's really hard to reach when the engine is in the car.
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Old 11-18-2013, 01:28 AM   #6
Megalocnus
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New rear main seal, starter, oil pan gasket, oil filter housing gasket, every rubber hose or vacuum line, the hard coolant pipes on the intake side, and the CCV system.
You may do the valve cover gasket and the VANOS seals before the installation. This will allow you to take a look at the cams before you put the engine in. The job isn't more difficult to do once the engine is inside the day though.
Not sure about the exhaust manifold gasket...

Last edited by Megalocnus; 11-18-2013 at 01:36 AM.
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Old 11-18-2013, 11:43 AM   #7
bee-em-dougle-u
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Wow, you got a smokin' deal on that 323i! Is the rest of it in decent shape? Way to get another E46 back on the road. Keep us posted on your progress.
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Old 11-18-2013, 11:50 AM   #8
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It appears you are pretty new. Lookup the user Mango and read through his signature links to find the right parts and where to start. Look under the DIY section of the forum if you need help installing anything. Check the sponsors for the best deals on parts..I suggest ECS Tuning and Real OEM.

Welcome to the forum and good luck!
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Old 11-20-2013, 01:47 AM   #9
JERRYUSMC323i
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Thank you all for the inputs sorry I am not able to get on everyday being a Marine take a lot of my time then family. To answer some of you question.
My 1999 323i has a manual tranmission, the used motor has 200000 plus miles but the motor in in good shape.
I am going to make a list of parts I know need to be replaced here so the next person that buys a used engine has a list of parts they need to change and thing the may want to do to save a head ache later.
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Old 11-20-2013, 02:05 AM   #10
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What to replace on a used engine.

I second the CCV, oil pan gasket, and starter especially among other things.

Access for the CCV hoses is bad when the engine is in the car and you have to blindly fish hoses around. Oil pan gasket you'd have to support the engine and lower the subframe otherwise. Starter I hear you'd also have more blind bolts and creative socket extensions and playing Tetris under the car. I'm sure with the engine out a starter and oil pan would both be a piece of cake, and at 200k if its original that starter would be a smart idea to do.


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Old 11-20-2013, 02:10 AM   #11
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Just finished an engine swap on a 2004 325Ci, put in a 3.0L motor and had to change lots of parts since they aren't the same as the 2.5L motor.

Replaced the complete CCV system, coolant hoses and pipes, water pump, thermostat, belts, pulleys, valve cover gasket, oil pan gasket, oil filter housing gasket, plugs, oil filter, air filter, starter, motor mounts, sensors, power steering hoses. Other things too I don't recall.

Skipped the front and rear crankshaft seals because the donor motor had no leaks and they are a pain to do, plus new seals might START a leak, and wouldn't that be lovely?

Replace anything that is not perfect. Don't use any ancillary part from the old overheated engine unless the part is tested good. Overheating is bad for ALL engine parts, not just the head/block.

I would clean the engine compartment to immaculate perfection while the motor is out. Make Mango proud!
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Old 11-20-2013, 07:29 AM   #12
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I probably would have looked for an engine with less miles on it. 200k is getting real close to overhaul territory.

GL with what ever you decide to do OP.
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Old 11-20-2013, 07:42 AM   #13
Ugur Ekim
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Would be awesome if you started a thread about your progress! But as you told us, you are busy and it will take some time to update everything on the thread including pictures and such..
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Old 11-20-2013, 07:54 PM   #14
JERRYUSMC323i
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I plan on starting a thread here about my progress. 200,000 is good enough for me as this is a car that I will only drive to and from work. I plan on buying another BMW in about a year but I got this one for a steal of a price $400 can't beat that for a work car. $1450 for a motor that has great compression with a 2 year warranty. But right now I am making a list of parts that I am going to change before I install the motor. Once it is complete I will post it here. Yesterday I check the CCV on the used motor and the plastic just crumbled like crackers so it will be changed. The starter is going to be reworked at a generator shop and so is the alternator. The the water pump looks new and has the metal impeller but i don't it i wanna risk it. It looks like the valve cover gasket was just changed. But I will take a better look. But I am going to replace the thing that I know cause the most problem and fix the rest as they break. I love working on cars so it wont be a problem for me.

Last edited by JERRYUSMC323i; 11-20-2013 at 07:56 PM.
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Old 11-21-2013, 03:08 AM   #15
David McMahon
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Quote:
Originally Posted by JERRYUSMC323i View Post
so is the alternator.
Often the Power steering tank cap leaks over the alternator and harms it. I've seen people put socks on them! I'm sure the proper fix is a new cap or one where the top hole is routed down outside the car.
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Old 01-17-2014, 01:56 PM   #16
JERRYUSMC323i
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Okay finally got the car back together in a couple of days I will post what all I replaced!


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Old 01-17-2014, 02:16 PM   #17
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picz or it didnt happen
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Old 01-17-2014, 02:57 PM   #18
Willie00328I
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Air distribution manifold seals, injector seals air intake boots.

http://m.ebay.com/itm/181303727449?nav=SEARCH&sbk=1

Also a good time to change the steering coupler.


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Last edited by Willie00328I; 01-17-2014 at 03:04 PM.
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