I just replaced the rear main seal on my 420sel and after reinstalling the trans the car barely accelerates. It acts like the timing is very retarded. It ran fine before I pulled the trans. I check all the connectors and hoses and they are fine. Even in park or neutral it seem very sluggish when I try to rev it up.
Help!!

IF you un-bolted the flex plate from the RING then you could have the timing advanced OR retarded 40 deg!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Holy smokes that's not good. I believe you are right! No sense in fussing about it I will just have to do it right this time. Does the ring or the flex plate have some kind of reference mark?

Look at this website. This addresses your problem specifically. Haasman sent me this site for my problem, and it happened to have this on it too. I guess you'll get really good at transmission R&R huh??:p

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."

Well yes it takes me approx 45 minutes to remove and maybe 1 hour back in. But only because I've practiced twice..... Can't really fault anything or anybody except the guy in the mirror ha ha.

Don't feel so bad as I also goofed up on reassembling the flexplate/ring gear on my 420. It took me a while to figure it out because I had the engine totally disassembled over the course of a month or so. I went back over everything, valve timing, wiring, vacuum lines, etc.,

It was a very humbling experience to say the least.

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Chas

Had a 380SL, 450SL, 380SEL, 420SEL, 500SEL

Got a Euro 500SEC right now.