The weakest atmospheric power units M102 have a volume of 2.0 and 2.3 are not common - they were installed on cars produced in the early 90s. Of the common ailments of these motors, one can note a small resource of the camshaft and timing chain - 100-150 thousand km, "zhor" oil - appears as a result of wear of the valve stem seals, engine mounts quickly fail. To date, most of these power units have been overhauled, the only question is how high quality it was and what parts were used. When buying a Mercedes Gelendvagen with an M102 power unit, you need to be prepared for anything, and in the event of a serious breakdown, it is better to buy a fresher engine, since it is not known how the engine was operated and maintained and how many non-original spare parts were put there during this time. On more recent machines, M103 engines with a volume of 3.0 liters are installed, which are very similar in design to the M102 series engine, but have more cylinders. The common disadvantages of these power units include: unstable engine operation - occurs as a result of clogging of fuel injectors. Poor quality of the U-shaped gasket of the front cover of the engine - it starts to leak over time. Like the older motor, every 100-150 thousand km you have to change the valve stem seals. If this is not done, the consumption of expensive branded oil will unpleasantly surprise you. The timing chain begins to stretch closer to 150,000 km, along the way accelerating the wear of the tensioner and sprockets. Given the age of the power unit, we can safely say that during operation there will be other breakdowns associated with natural wear and tear. Both engines, with proper maintenance, take care of more than 500,000 km without serious problems. In 1994, the M103 gave way to the M104 engine. This power unit has become more reliable, but not ideal. The main problem with these engines is the leakage of the cylinder head gasket and the oil filter heat exchanger housing. Also, you can note the tendency of the motor to overheat. The main source of the problem is the poor condition of the cooling radiator and viscous coupling, the resource of which rarely exceeds 100 thousand km. As a result of overheating of the engine, as a rule, warps the cylinder head. When using non-original engine oil, the likelihood of clogging of oil injectors increases, which leads to scuffing in the cylinders and more noisy engine operation. From time to time, it is necessary to check the condition of the wiring harnesses under the hood - over time, it cracks and can close to each other. Very often this leads to failure of the engine control unit. With proper maintenance, the motor does not require serious interventions up to 400-600 thousand km. In 1998, this motor was replaced by a more complex power unit of the M112 series. As with older power units, increased oil consumption is considered a common occurrence. There can be two reasons - carbon contamination of crankcase ventilation and wear of valve stem seals. Often, owners note the appearance of oil leaks through the oil heat exchanger seal. When using low-quality gasoline, you should not count on the long-term operation of the injectors (60-80 thousand km). The problem is manifested by a drop in power. The motor resource of this unit is about 300+ thousand km. The 5-liter V8 M113 engine has similar shortcomings and a resource. The M113 was replaced in 2007 by a more powerful 5.5 liter M273 engine, which is considered the most unsuccessful - the ceramic-metal sprockets of the balancing shaft wear out quickly, there are often problems with the exhaust manifold flaps, and the exhaust manifold plugs flow. For "charged" versions of the car (AMG), the engines of the M113, M137, M157 and M275 series were used. The M137 power unit turned out to be not very reliable, because of this it was not installed for long - from 2002 to 2003. Most often, failures occur in the ignition and control systems for unbalanced cylinder operation, as well as in the deactivation system for the left row of ZAS cylinders. Another common ailment is the current heat exchangers, weak threads in the holes for the cylinder head bolts. More modern M157 and M257 engines are also not problem-free, and considering who drives them and how, problems with them can be very serious and expensive. But, if you have money to buy and maintain a 550-horsepower car, then you should not worry too much about this, because in case of any trouble, you can pull the repair.
Old aspirated OM602-603 are not only simple and reliable, but also have an impressive resource - about 1,000,000 kilometers. But they also have a weak point - the engines are prone to overheating. Therefore, you should carefully monitor the temperature level of the engine and the condition of the radiator, pipes and fluid in the cooling system so as not to overheat the engine. If this trouble happens, in most cases it is necessary to change the cylinder head. No less successful is the 177-horsepower three-liter engine (OM606). The first serious problems with it, as a rule, appear after 400,000 km of run. The most common ailment of this engine is the wear of the connecting rod bearings (400-500 thousand km go). Of the minor troubles, malfunctions in the operation of the K40 relay unit can be noted - the problem is solved by soldering the unit. Its main drawback is that the temperature sensor in this motor is poorly located, because of this, drivers often find out late that the engine temperature is at a critical level - a high probability of overheating with all the ensuing consequences. For the restoration of the power unit, the mechanics will ask you for at least 1800 bucks for replacing the cylinder head. More modern power units with the prefix CDI in the name, equipped with fuel equipment with a Common Rail injection system, are not only sensitive to the quality of diesel fuel, but also require high repair and maintenance costs. Owners of a Mercedes Gelendvagen with an OM612 engine often encounter valve failures in the intake manifold and injection pump, and on some instances there were problems with the cylinder head. In the most common three-liter OM642 engine (since 2006, the only diesel engine in the lineup), up to 200,000 km, it may be necessary to replace the injectors and the timing chain with a tensioner. But the biggest trouble is the destruction of the intake manifold. When the collector particles are destroyed, they enter the turbine, damaging its blades, shaft, and also the geometry change mechanism. If you monitor the condition of the collector, the turbine will last at least 200-250 thousand km. To avoid unexpected costly repairs, it is necessary to change the glow plugs in a timely manner, the fact is that when they are not in working condition, they quickly stick and it is not always possible to unscrew them in a natural way - the cylinder head needs to be removed to drill out the burned-out candle. If during engine operation there is extraneous noise and vibrations are felt, first of all pay attention to the condition of the crankshaft pulley clutch. The most powerful 4.0 CDI engine (OM628) has serious design flaws with fuel equipment, which entail constant expensive repairs, and also significantly accelerate the wear of the piston group and block heads. Most often, fuel equipment bothers - piezo injectors and high-pressure fuel pumps. The timing chain, as a rule, begins to stretch closer to 200-250 thousand km, often the turbine needs to be replaced at the same run. The solution to any of these ailments will require no small investment. It should be understood that most of the Mercedes Gelendvagen power units have already been affected by time, so you need to be prepared for the failure of control units, relays and all kinds of sensors from the first days of buying a used Gelika. On a car older than 10 years old, wiring dries out from old age, attachments fail, air leaks appear.
The paintwork is rather weak (especially on cars of recent years of production). Because of this, the paint in the front of the car, wheel arches and sills quickly sandblast and require constant updating. Many owners of the Mercedes Gelendvagen, in order to reduce costs, rushed to paste over the body with a protective film. Despite the fact that the car has smooth body lines, it turned out that the Gelik is one of the most difficult machines for pasting with a film, so the cost of such work is quite high. With increasing age, there are many questions about the corrosion resistance of the body. Door hinges are considered the weakest point - they begin to corrode after 5-6 years of operation. In the first years of a car's life, paint will peel off on the outer hinges, and rust streaks may also appear. On cars older than 5-8 years, significant traces of rust can be found on the welds, windshield frame, sills, tailgate and roof gutters. On cars of the first years of production, the body mounting brackets, shock absorbers, rear support springs, without proper care, rot and fall off the frame. You can also find rust in the area of \u200b\u200bthe rear optics, and in the absence of a heat-insulating muffler screen, also on the floor of the body. A fairly common phenomenon is the development of corrosion under a layer of paintwork, the presence of such a problem will be notified by swollen areas of paint. If the problem is not solved for a long time, it may happen that the steel in this place will rot through. Also prone to corrosion are the exhaust system and the metal straps of the fuel tank. The five-door versions of the cars are more likely to crack the sealant at the joints in the rear, while the three-door versions and the convertible are free from this problem. The Vin-number of the body also requires special attention. The fact is that it is located on the frame in the area of \u200b\u200bthe front wheel arch, and is exposed to moisture, dirt and reagents. The frame is another weak point of this car, if its condition is not monitored, then it can corrode to the point where operation is already contraindicated. Often, moldings and door seals add a headache to the owners - they peel off. The windshield, the owners often call it a consumable, since with frequent trips along the highway it has to be changed every 30-50 thousand km, and here the reason is not the quality of the glass, but its unfortunate location. Another of the chronic sores can be noted the wear of the axles of the windshield wipers and the souring of the hatch drive mechanism. For machines equipped with a sunroof, it is necessary to clean the drains, otherwise the sunroof may start to leak. Over time, the doors begin to close poorly, and the glass of the side windows begins to rattle, especially in the half-open state.
The classic five-speed mechanics were installed on the Mercedes Gelendvagen (they were installed only on cars of the first years of production) and automatic transmission. The most interesting thing is that almost all automatic transmissions produced by the Mercedes concern over the past thirty years have been used on the Gelendvagen. The mechanics, like the old automatics (4 and 5-speed 722.3 and 722.6), are simple and reliable. Their resource to the capital, depending on the operating conditions, is 300-500 thousand km, for restoring the efficiency of the box they ask from 1000 to 2000 dollars. Owners of cars with such boxes know such a feature as automatic transmission freezing. This means that in severe frost the car will not go anywhere if it does not warm up for at least ten minutes. Most often, this problem occurs on cars with diesel engines. Since 2006, the car began to be equipped exclusively with a 7-speed automatic transmission Tiptronic (722.9). This gearbox is not only less reliable than the classic "automatic", but it is much more expensive to maintain and repair. The most common problem is jolts (kicks) when starting, accelerating and stopping. At an early stage, the problem can be solved by flashing the transmission control unit, if the problem is not dealt with, clutch replacement will soon be required. Also a common occurrence is the failure of the valve body, solenoids of the control valves. The problem is so widespread that the manufacturer even had to produce a special repair kit. Also, incorrect operation of the transmission can cause electrical problems. With age, seals and pipe connections lose their original tightness, resulting in fluid leakage. It is not worth delaying with the replacement of seals, as this is fraught with overheating of the box with subsequent costly repairs. With proper maintenance, the average life of a seven-speed automatic transmission before overhaul is usually 200-250 thousand km, then repairs are required - from 500 USD. The all-wheel drive system on a Mercedes Gelendvagen, after 250,000 km of run, often presents surprises in the form of a transfer case failure (bearings and gears wear out) and lock control pneumatics. The problem is aggravated by the fact that not every master is able to identify a malfunction of vacuum, hydraulic and pneumatic drives. Over time, the front axle may begin to hum, fortunately, there are no such problems with the rear axle, but grease may begin to flow around the wheel hubs (replacement of bearings is required). For the bulkhead of one bridge, as a rule, they will ask for more than $ 2,000. Timely replacement of grease in both axles can significantly extend their service life. When increased vibrations appear, first of all, you need to pay attention to the condition of the crosses of the front or rear driveshaft. In most cases, they serve no more than 250,000 km (they ask for about 250 USD for restoration). The driveshaft crosses require regular injection, at least once every 5 thousand km, otherwise an expensive repair of the driveshaft will be required. Often, vibrations appear as a result of severe wear of the CV joint of the intermediate cardan shaft. Every Gelendvagen owner should know that as soon as the car starts to slip, it is necessary to immediately turn on the differential locks. The fact is that the design of these nodes is such that when slipping, they become very hot. With strong slippage, the temperature rises so high that the parts are welded together and when leaving on a hard surface, the differential, as a rule, falls apart. There were cases when all three differentials fell apart at the same time. If such a nuisance happens, prepare to pay about 6,000 bucks for repairs. In many respects, thanks to the reliability of the Mercedes Gelendvagen suspension, motorists associate it with a tank. We have to admit that the suspension of this model is really strong, but requires timely maintenance. It is necessary to regularly lubricate the hinges in the front wheel drive (at the first signs of wear with their replacement, it is better not to tighten). You also need to monitor the integrity of the anthers, even if there are microcracks, it is not worth tightening with their replacement, since dirt quickly kills the hinge. It is also necessary to regularly service the front steering knuckles, and once every 250-300 thousand km they must be sorted out. There should not be any smudges on the steering knuckles, if there are any, get ready for an expensive repair. If the gearbox bearings in the axles fail, they must be changed in a timely manner, since the consequences can be the most unpleasant, if the seat is damaged, the axle assembly will have to be changed. If 5 adults constantly drive in the car, you should not count on the long service life of the rear springs after 60-80 thousand kilometers), and closer to 100,000 km, they will need to be replaced in tandem with shock absorbers. The “headache” can be added by the fifth shock absorber - the steering damper, over time it weakens and the car ceases to be controlled as before. When using rims with an abnormal offset, the life of the wheel bearings is not infinite (up to 200,000 km), the use of regular rims increases their service life up to 400,000 km. If at a speed of 90 km / h or more vibrations appear on the steering wheel that do not disappear after balancing the wheels, get ready for an expensive replacement of the front cardan. Another problematic area is the suspension position sensor and the ABS wiring located under the frame. Often, after a side impact with the front wheel, for example, on a curb or other obstacle, the Panhard rods bend. With this trouble, only a replacement will help, since after restoration (alignment of the rods) over time they will bend again. The steering is reliable, but with aggressive operation it may have mechanical damage, therefore, it is recommended to make a test drive before buying. In the presence of malfunctions, the steering wheel will have a strong play, and while driving, the car has to be “caught”. The brakes are reliable, but after 10-15 years of operation, the brake lines begin to corrode. At the same time, the vacuum booster of the main brake cylinder fails. It is also worth noting the rapid wear of the brake pads, one set is enough for 25-30 thousand km. In the Mercedes Gelendvagen salon, premium finishing materials are used, the quality of which few people have questions about. But the spaciousness will not really please fans of space, since there is frankly not enough space in the cabin, especially considering the size of the car. Among the shortcomings here, the current stove faucet can be noted, and the owners often blame the inefficiency of the cooling system (the interior heats up for a long time). As for the reliability of electrical equipment, we should talk about two different generations here: cars produced before 2000 and after. The former do not have serious problems with the equipment, but age nevertheless makes itself felt - the wiring deteriorates, the relays burn out, the contacts oxidize, microcracks appear on the tracks of the electrical boards. But more recent copies can cause a lot of trouble in the form of failures, for example, such as the failure of blocks located in the driver's door (in case of failures, the battery quickly runs out). A garland of errors may pop up on the instrument panel, most often the culprit of this ailment is the trailer electrical control unit (located under the rear left window). The reason is moisture gets into it.
If you are the owner of this car model, please describe the problems that you had to face during the operation of the car. Perhaps it is your review that will help readers of our site when choosing a car.
Comments
Post a Comment