W114 Engine swap ideas

1968 - 1976: 220, 220D, 230, 230.4, 230.6, 240D, 250, 250C, 250CE, 280, 280E, 280CE, 300D
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Posts: 57
Joined: Tue 12 Feb, 2013 8:12 pm
Model you own: w114
Location: Adelaide, S.A.

W114 Engine swap ideas

Post by gorms36 » Mon 07 Nov, 2016 12:45 pm

Hey all,

Been a while since I posted anything on here and comes with good reason. The twin zenith engine is doing my head in and have been quoted approx $1000 to repair the zeniths to get back to running again. Any ideas on what I should do? So annoyed right now.

If anyone knows anything about the zeniths that would like to look at this car that would be amazing or if anyone has a set of carbies I could fit that would be good too. Obviously I would pay you for your time.


Cheers all,


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Posts: 3553
Joined: Wed 07 Feb, 2007 9:17 am
Model you own: w111
Location: Adelaide

Re: W114 Engine swap ideas

Post by pastelgrey300D » Mon 07 Nov, 2016 1:59 pm

Easiest alternative would be a weber conversion - I've never looked back since fitting webers to my Finnie and putting the zeniths in a box to gather cobwebs!

I did a big write up on it here: viewtopic.php?f=25&t=16274
1967 W111 230S - Horizonblau
1965 W110 190c - Mittelrot
1967 W110 200D - Weiss (work in progress)
+ other classics

Posts: 141
Joined: Mon 24 Mar, 2014 7:32 pm
Model you own: w114
Location: Adelaide

Re: W114 Engine swap ideas

Post by oldmercfan » Tue 15 Nov, 2016 5:13 pm

I suggest you take the car to Olaf At Horst Auto Repairs. I have not used his services, but know those you do and speak very highly of him. I rang him the other day to chat about an auto transmission problem (which he specialises in), and we got around to talking about the 250 motor and the twin zeniths. Like you, I hated them, even after a carby overhaul. But Olaf knows all the stories and the gripes (even the one about the carbs warping because they sit over the exhaust manifold), and says it's all bunkum. He says most carby overhauls are done by those without any real knowledge of the Zeniths. You just have to know how to tune them properly and once they are set, they will run trouble free for years.
1972 W114 280E (Tiefblau)
1986 W201 190E (White)

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