Buying Used MB engine? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 09-09-2007, 03:09 PM Thread Starter
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Exclamation Buying Used MB engine?

Hi .

A question to all you Project freaks .

I am considering buying a USED mercedes engine from an auto breaker.

But i don't have a clue on how to deterime if the engines stocked up at the breaker are any good.

Some said it can only be known by dropping it in the car. But then thats not very practical.

Could someone please point out the proper method/tests to buy a used engine.

Any thing i should look for or note ?

I am intrested in the M119 V8. but experience from other engines is appreciated.


Thanks in advance
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post #2 of 7 (permalink) Old 09-09-2007, 04:10 PM
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The seller could run a leak-down test on each cylinder and supply you with the results.
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post #3 of 7 (permalink) Old 09-09-2007, 04:46 PM
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Originally Posted by MarcusF
The seller could run a leak-down test on each cylinder and supply you with the results.
Or, failing that, sell it to you cheap enough, where you won't care.

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post #4 of 7 (permalink) Old 09-09-2007, 06:50 PM
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a warrenty should come with the engine. even the most run down engine shops around here have a 30 day warrenty on all engines. if they dont. they dont trust there engines which means you shouldnt either.
but firs you should check the following.
compression-most shops have the read out(leak down test)
inspect for damage to bell housing(where tranny mounts), oil pan,oil stains
most shops wash there engines but you can still see were there was oil sitting then washed off. good look on your purchase
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post #5 of 7 (permalink) Old 09-09-2007, 09:06 PM
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Also keep in mind what all pieces you actually will be getting with the engine. Some places will sell you an engine that is literally a drop-in, you just hook up your wiring harness to it and go. Those engines still have the fuel injection system, throttle body, MAF, PS pump, etc still on the motor.

Others will strip all of that and just sell the ENGINE. If this is going in a new application [as opposed to a replacement of the same type engine] you might find yourself looking for some very expensive parts to hang on that new engine you just bought.

Also keep in mind if you are putting in an M119 in an application that did not previously have that engine, you will most likely need the LH Computer modules, wiring harnesses [upper and lower], mods to the main body harness and a bunch of other fitments.

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post #6 of 7 (permalink) Old 09-10-2007, 01:38 PM Thread Starter
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Thanks for the comments guys.

Is a leak down test done before installing the engine or after ?

Any way to figure out if the crank is good or goner ?

thanks again
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post #7 of 7 (permalink) Old 09-10-2007, 04:10 PM
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It's definitely done before you send any money.

It can be done while the engine is sitting in the old chassis, or while it's sitting on a pallet being prepped for shipping. Just make sure it's a leak down test, not a compression test. A leak down test will determine whether each of the cylinders can hold compression, and if they can't, it tells the seller what percentage is being lost, and a general idea of where it's being lost.

Almost forgot about the crank question - Cranks have to be mic'd to confirm that they're in perfect shape. I'd be more worried about the valvetrain than the crank.

Last edited by MarcusF; 09-10-2007 at 04:13 PM.
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