420 SEL Engine Removal Guide
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Newbie
Joined: Mar 2008
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From: Atlanta, GA
1984 300SD, 1987 420 SEL, 1989 190E 2.6
420 SEL Engine Removal Guide
I need some help in obtaining instructions on the removal of a 1987 420 SEL, any web site would be greatly appreciated.
Senior Member
Joined: Jun 2006
Posts: 303
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From: Northern California
It changes all the time
It's pretty simple really. You disconnect all hoses and electrics that connect the engine to the chassis, remove the two bolts that connect to the exhaust, remove the two engine mount bolts. and remove the 6 torque convertor bolts. To remove the torque conv bolts turn the engine clockwise with a 27mm socket on the crank as you are facing the engine. Remove only the 13mm bolts from the torque conv. Do not remove the 10mm bolts. Push the conv back,and support the trans with a floor jack. Hook a chain to the lifting brackets on the top of the engine, and yank that sucker outa there with a cherry picker. It's always a good idea to remove the radiator to give more clearance and prevent damage.
Senior Member
Joined: Jun 2006
Posts: 303
Likes: 1
From: Northern California
It changes all the time
You're welcome. If you need clearer instructions on the converter, let me know. If you accidentally undue the 10mm bolts, the ring gear will fall off. You will need to line up some little holes to install or the timing will be off by 30 or 60 degrees.
Thread Starter
Newbie
Joined: Mar 2008
Posts: 4
Likes: 0
From: Atlanta, GA
1984 300SD, 1987 420 SEL, 1989 190E 2.6
420 SEL Engine
Pull engine, without a problem. I purchase a replacement engine and before I put that bad boy back in the 420, I want to replace some stuff (the rear engine seal, oil pan gasket) please tell me if I missed anything else.
I want to ensure that I don't have to have a mechanic to go back replace some stuff. I would need to know how much grease for example (and the best type of grease) I would need put on the rear engine seal and do I need any special tools. I have the MB 126 manual and it talks about applying grease according to the 226 something specification as I recall. Any help would greatly be appreciated. BTW, I'm replacing everything hoses, gaskets, plugs and fuilds (oil and trans).
Afterward, it going to the shop to ensure that she going to run perfectly and a paint job.
I want to ensure that I don't have to have a mechanic to go back replace some stuff. I would need to know how much grease for example (and the best type of grease) I would need put on the rear engine seal and do I need any special tools. I have the MB 126 manual and it talks about applying grease according to the 226 something specification as I recall. Any help would greatly be appreciated. BTW, I'm replacing everything hoses, gaskets, plugs and fuilds (oil and trans).
Afterward, it going to the shop to ensure that she going to run perfectly and a paint job.
Senior Member
Joined: Jun 2006
Posts: 303
Likes: 1
From: Northern California
It changes all the time
I personally wouldn't bother replacing the rear seal. They really are not prone to leaking. You can do the lower pan gasket if you like. IIRC there is no gasket on the main pan. I would deffinitelly change the trans front seal. It is most prone to leaking, and you will have to pull the tranny again. Pay close attention to how deep the converter goes into the bell housing. Also use a seal that comes from the dealer with all the stars on the box. There is a difference between OEM and OE. I would not waste my time putting in an OEM seal here. I don't like to pull trannys twice. Just before you stab the new engine, Post again for some critical instructions that could save you a tranny.
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Newbie
Joined: Jul 2009
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From: Minnesota,USA
1989 420 SEL
Have a question my 420 has an original radio, the aftermarket 1st owner installed was stolen, I tried to reinstall but have no power could the fuse have blown and where is the radio fuse? also I seem to have a plug missing or perhaps never was would be top left if facing backwards, wish I could find a simple diagram, if anyone would pls email bigrick at brick7985@msn.com by the way I am possibly interested in tradeing my ride for a Goldwing 1500 or Yamaha Royal Venture full dressed bike(s)
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