Mercedes-Benz pioneered the W123 4-door version on the 29th of January, 1976. Despite the fact that the new model had some technical similarities with their precursors, these new models had larger exterior and wheelbase dimensions. The W123 version was developed using a highly updated style although some of the technical links with W114/W115 were preserved. Primarily, all Mercedes-Benz models excluding version 280/280E contained quad uneven-size rounded headlights together with the earlier larger rectangular units. When refurbished, these units were standardized across all the ranges. All version W115 were passed over together with the 3-liter five-cylinder diesel engine model being re-titled from the 240D 3.0 to the 300D (same as to what it had been referred previously in markets within North America). The only up-to-date engine by then was 250s 2252 cc inline six (an M123 type which is a short stroke engine version of the 2.8-liter six M110 model) that reinstated the old version 2496 cc model M114 “six.”
A coup version was introduced during the spring of 1976 which when compared with the saloon was on a smaller wheelbase (2710-milimeters same as 106.7-inches vs. 2795-milimeters same as 110.0-inches). The new version W123 C/ CE available as 230C which was later changed to 230CE and 280C/CE as with most markets. However, North America had extra 300CD versions which were naturally extracted and were later turbocharged 3-liter diesel engines.
It`s a compliment to the vehicle`s instant quality and presumably to the caution engineered into the assembly schedules that nine months following its launch, a black market had already established in Germany for the Mercedes-Benz version W123s offered for instant delivery. Clients eager to requisition new cars from their native approved dealers for the counseled starting price experienced anticipating time in far more than twelve months. In the meantime, barely used models that were available instantly demanded a reward over the latest price value of about DM5000.
Beginning the August of 1977, long wheelbase versions of around 3425mm (134.8 In) were developed. These we offered as 7/8 sitter-saloons together with work bodies or as chassis that had complete forward-facing body clip, earlier functioning as the foundation for hearse and ambulance bodies through outside dealers such as Miesen or Binz. These Lang models could be requisitioned as 300D, 240D, and 250D models.
W123T was introduced At the Frankfort automotive Vehicle Show, which was conducted in September 1977. The T within the model designation meant transport and touring. All engines derived except the “200TD” were offered within the range. The T production started in March 1978 at the Mercedes Bremen factory.
Early 1979, the 200D diesel model power output was amplified from 55 PS (40-kilowats; 54-horsepower) to 60 PS (44-Kilowatts; 59-Horsepower). From 65 PS (48-Kilowatts; 64-Horsepower) to 72 PS (53-Kilowatts; 71- Horsepower) in the 240D version and the 300D version, from 80 Ps (59-Kilowatts; 79-horsepower) to 88 PS (65Kilowatts; 87horsepower). It is during this time that the 200D version was faced off.
The production of the W123, which is the initial Mercedes-turbo diesel started in September 1979. It was a 300TD turbodiesel that was offered with solely automatic transmission only. The turbocharged five-cylinder 3-liter diesel engine (version OM617) in most markets was offered within the T body vogue whereas North America it had been additionally offered in coup guises and saloon.
A brand four-cylinder petrol-engine (model M102) were introduced in June 1980. Also, a brand 2-liter 4 with briefer stroke took the place of the old M115, which was fuel injected 2.3-liter version of that particular engine model (in 230E/CE/TE) the recent carbureted 230. It is important to note both engines were stronger than their predecessors.
In 1980 and 1981, the carbureted 280-versions were faced off, but fuel injected version 280E was still available.
In September 1982, all brands experienced a gentle facelift. The oblong headlights, antecedently fitted solely to 280E/280 were typical in all models, as was steering mechanism. Since Feb 1982 a nonobligatory five-speed physical transmission offered across board excluding the automatic-only 300-turbodiesel).
The W123 production ceased in January 1986 with 63-final T models rocking out. Most well-liked individual models were; 230E (442,000 built), the 240D (455,000 made), and, therefore, the 200D (378,000 built).
As from August 1980, W123 introduced improvements which included; a retractile steering column, ABS and a driver airbag which was optional since 1982. Power (vacuum servo) aided disc brakes became common in all W123s. Offered options included the following; Mercedes-Benz texturized cut vinyl (MB-Tex) upholstery or leather or velour upholstery exterior passenger side mirror (typical in all T models). They also included; wood interior trim, 5-speed manual gearbox (only in the European markets), 4-speed automatic transmission (typical in turbo-diesel models) and a vacuum battery powered central lock-ups. Also, they contained; power windows together with back seat switch cut-outs, rear facing extra seats (only for stationary wagons) automatic differential, and standheizung (pre-start timer controlled engine heating). Also they had Sunroof, climate management, air conditioner, Alpine horn(selectable more silent horn), light source wipers (only in the European markets) power steering (typical since 1982/08), converter (available since 1984 for California state only and in Germany since fall(autumn) 1984 for the 230E out of which only 1000 were built.
Resources: W123 Repair