W124 Buyer’s Guide MercedesBenz Forum

3 Мар 2015 | Author: | No comments yet »
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W124 Buyer’s Guide

As any Mercedes-Benz, the vehicle’s history is Regular service and maintenance are and given this, a W124 have a long life. mechanical components are long All engines in these models are of surviving to huge mileages in Mercedes fashion.


Whilst all engines are long lasting bottom end work being unheard of, there are a few issues to be of. All petrol versions can suffer gasket problems although it is common on the sixes and least on the 16-valve fours. The failure of the is not usually a compression failure and does not affect the way the engine Instead, engine oil usually its way into the coolant, becoming when it floats to the highest in the coolant reservoir. An external oil from the head gasket at the exhaust side of the engine precedes the appearance of oil in the coolant, on the M103 and M104. Head replacement is not particularly difficult but the time can make up much of the involved. Replacement head have undergone design that help prevent Good maintenance of the cooling including frequent renewal of the (I believe more frequently the recommended 3-yearly) with the coolant (identified by its blue can help prevent head corrosion and failure. At the very valve stem oil seals be replaced and possibly also guides (on early or high engines) whilst the cylinder is off the engine. Obviously the head also be checked for flatness and if necessary.

The M103 and M104 are known for oil leaks from the cover at the front of the engine. not a difficult repair and one that can separately or as part of a head replacement. High mileage and M103s may also require replacement of the hydraulic valve adjusters (lifters) should continue to tick after oil rises (brief ticking oil pressure rises is no cause for Early M102s used a row timing chain which periodic replacement, as failure in severe engine damage. M102s changed to a double row which offers a much life. The M103, M104 and all offer long chain despite the M103 using a row chain. A cosmetic issue many engines is the failure of the on the valve covers, particularly the models with a black The coating is required as the valve are a lightweight magnesium alloy. valve covers can also resulting in oil leaks from the and late versions of this have a plastic oil separator the valve cover which can brittle and crack with Apart from these the engines themselves are very So long as regular oil and filter have been performed, the should be clean internally and an oil of above about 1 bar at hot idle rises to 3 bar when driving tend to indicate good condition.

Most other engine involves normal maintenance and ancillary equipment. All models a serpentine poly-vee belt. belt is long lasting, the automatic tensioner can fail, after being disturbed belt replacement. The bushes in the damper can also wear a rattle at the front of the engine. components in the cooling system radiator tanks and coolant will become brittle age resulting in eventual failure. If the plastic thermostat housing is fitted, it is recommended that a alloy one be fitted. Coolant (water pumps) can fail, preceded by coolant leakage. of the temperature gauge can reveal problems with engine such as thermostats, fan clutches and switches for the fans. Coolant should run between about 85 and 95 centigrade except in very hot conditions or when stationary as in heavy traffic) when of up to about 105 degrees are considered

All fuel injected W201 and pre 1993 fuel injected models (ie. most all M103 and 3 litre M104 utilised proven Bosch fuel injection. On all but the earliest this was K-E (CIS-E) Jetronic. this system is reliable and offers the advantage that it can to function with a failure of (or of electrical supply to) the electronics, with difficult cold and reduced efficiency. On the occasion a problem does occur the fuel injection, expert is recommended to ensure a fast to the problem. The K-E system is not always understood by those attempting to faults and incorrect diagnosis can to ongoing frustration. Faults with the K-E injection system are electrical and can include a faulty protection (OVP) relay, pump relay, electro-hydraulic (EHA), potentiometer on the fuel and the idle control valve. of faults with these can include difficult cold poor idle speed or intermittent stalling. Rough can also be caused by hoses in the air circuit which have hard or cracked with Ignition systems on the K-E injected were by a separate EZL electronic module (which includes control of ignition advance), a ignition coil and high distributor. This system is reliable.

Late (1993 petrol W124 models M111 and late M104) fully electronic Bosch HFM fuel injection. The ignition was integrated with the fuel ECU and the high voltage distributor was no required due to the use of a separate ignition for each pair of spark This system is generally apart from problems faulty wiring harnesses have become evident in years. Driveability and poor problems can often only be with the complete replacement of the wiring harness. The M104 (280 and 320 models) were the affected, however it appears any Mercedes manufactured in 1993, and ’95 can suffer from problem. An inspection of the wiring it is most exposed to heat near ignition coils recess in valve cover) reveal brittle and crumbling on affected cars. Replacement of the only takes a few hours, the harness is expensive to purchase. A harness should be replaced as in a few the ECU has suffered damage necessitating replacement. Faulty spark suppressor boots can also poor running on these Serious misfiring will in the ECU shutting down the fuel on the affected cylinder(s) to prevent to the exhaust catalytic converter.

All engines rely on the supply of air and fuel so routine replacement of is important. Fuel pumps are of those which have used on injected Mercedes for many years and many models use two pumps. The pumps can unreliable or fail on high cars with noisy being an early warning

Exhaust systems give a life and it would not be unusual to see of these models still with the original system. The engine mounts which good isolation from vibration will require replacement. Sometimes, what to be a rough idle, is actually by faulty engine mounts. under hard acceleration and in the driveline can be caused by worn couplings on the tail shaft.

transmissions last well, but usually require attention at time during the life of the They are perhaps not quite as as the 3-speed automatics in the W107 and V8 models of the 1970s. The 5-speed in W124 coupes from onwards (300CE-24, 320CE and have a reputation of being the durable of all. In some markets these coupes had the 4-speed automatic (as fitted to the and some local coupes been retrofitted with the due to the cost to overhaul the 5-speed. is a pity as the 5-speed auto the coupes strong acceleration a standing start combined a tall overdrive for effortless and cruising. Manual transmissions rare. These are not known to be and clutches are also reasonably apart from occasional problems with age.

Front suspension is a fairly lower control arm with absorber (damper) strut and spring setup. It is durable and little more than replacement of inexpensive strut mounts or anti-roll (sway) bar Steering was traditional Mercedes assisted, recirculating ball. As any Mercedes, the drag link, ends and steering damper may occasional replacement. The W201 the now standard five link suspension and the W124 continued it. This allowed for previously ride and road holding. Due to the complexity of this suspension, are numerous bushes that can after high mileage. is characterised by a tendency for the car to wander or in the rear. W124 wagons and 16-valve versions have self-levelling rear suspension. As the same system on earlier W123 and W126 models, the (air or nitrogen cells) to fail every 10 to 15 years. are neither difficult nor very to replace. Shock absorbers are of a quality and give long Brakes (which include ABS on all but the 1.8 and earliest W201) are strong and

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Normally when discussing to look for in a used Mercedes a model such as a W107), I put the greatest emphasis on body and a lack of rust. With the and even more so the W124, is virtually unheard of. A lack of damage or correct repair of any damage is obviously important. is unlikely to be a serious issue either the W124 or W201. quality is superb and even models that have well maintained will have good paint

Interiors are considered to be very particularly in the W124. Most had either MB-Tex (vinyl) or upholstery, with only getting cloth seats. was popular and lasts well and with MB-Tex should interiors that still like new. Perhaps the durable of parts of the interiors those areas most to sunlight. Tops of dashboards can although it is not very common. The along the tops of the doors, in the W201 can shrink and pull from the edges. Blue to be the worst colour for this Another common defect comes with age is that of cracks in the high gloss on the timber, mainly on the centre around the gear shifter. from the occasional leather or squeak, the interiors remain and free from rattles. The gas struts which hold the open on the wagons will lose the ability to do so due to loss of gas

Electrical and electronic faults are not to the engine. Cruise controls can intermittent or permanent faults, due to failing solder joints in the control amplifier. Power regulators and switches can give as can switches for power seat Wiring harnesses running to the doors (and tailgate on can fatigue and break due to constant Ignition locks can wear to the where they cannot be a problem that is not unique to models. Early warning of difficult operation of the ignition key be observed and the lock replaced it fails completely. Replacement is not whilst the lock can still be however if the lock fails it need the services of a locksmith.

Air are probably no less reliable for other cars however evaporators have been to develop leaks resulting in a of refrigerant. On the W124 replacement is a time consuming job. Few if any or W201s got the optional fully (push button) climate system which is just as as this system which was fitment on North American has proven unreliable with This system uses a air-sampling blower to draw air the interior temperature sensor near the front interior A hose runs down the pillar to the blower which is behind the glove box and noises from this area can be a worn blower. The main for the heating and air conditioning can also squeaks with age.

All these faults and problems may daunting, however it is highly that any one car would ever from all these problems and may never suffer from the of listed faults. Many of the mentioned will only a very small percentage of I have simply attempted to as many of the faults that I am of that can affect the W124. It is fair to argue that models are not quite as reliable as the W123 series (which believe to be the most reliable of all) but they are more cars that offer a driving experience. Some of the occur in additional features and that was not available on the older Likewise, some argue the W210 (which replaced the and the W202 (which replaced the do not offer the durability of the W124 or

Choose wisely when a used W124 or W201, it well, and I am sure that you too be very satisfied with car.

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