Okay, since the demise of the M116 in my 420SEL (not worth the cost to rebuild topend) I've decided to pick up a lower mileage M117 motor to drop in.

First, the M117 is a direct swap for my M116 correct? I plan to yank the trans with the motor to assist in labor on my end and lower mile parts.

Next, the M117 I am probably going to purchase has around 140K miles on it. Since it will be out, should I replace all of the chain guides with the chain and tensioner too?

Anything else I should consider while the motor is out? Maybe oil pan gasket? Rear/front main seal?

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

IF you get a 560SEL or SEC engine then that should be a bolt-in that requires very few changes. Make sure that the 560SEL motor has exhaust manifolds & crossover pipe.

Yes, the timing chain & rails are a good idea. ALSO all of the "rubber" hoses & o-rings at the intake area should be checked & replaced.

ALSO take the oil subpan off & look at the oil pump chain & install a new o-ring on the oil level sensor connection.

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Very few changes including what?

What should I look for on the oil pump + chain?



Thanks!

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Motor with trans is at my house, $227 out the door with tax for the both with 110935K mi. I will be doing this swap in about two to three weeks.

Should I grab the computer also from the passenger side kick panel? I have the ignition module too.

Another thing I noticed is I will have to remove the SLS pump off the front cover and swap on my 420 cover. Seems pretty simple.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]