Anhartic Posted August 27 Share Posted August 27 Greetings, everyone. Require assistance with a problem with my A Class 2007 1.5 W169 (petrol) vehicle. The serpentine belt became detached as I was driving. The power steering and ABS systems ceased functioning, nevertheless, I was able to safely navigate the vehicle back to my residence due to the short distance travelled. The belt that my technician replaced was promptly torn apart again as soon as he began the engine's idle. The first belt that he replaced was coated in grease and had been partly torn in the centre. The car has been experiencing an oil leakage. I saw the presence of a leak on my driveway as I drove my vehicle away. Oil stains. I have been informed that there is a possibility of a leak occurring on the tensioner, however, my technician has said that he did not see any oil leakage from that specific area. He stated his intention to replace the tensioner and idler pulley tomorrow. Will this prevent the belt from being destroyed again? Do you have any insights on the potential source of this oil leakage? The coolant and oil levels were within normal parameters and the vehicle was functioning OK until the belt suddenly broke. Thank you. Link to comment Share on other sites More sharing options...
RosaStyle Posted August 27 Share Posted August 27 It is possible that one of the pulleys has become stuck or immobile. Link to comment Share on other sites More sharing options...
AmericaMonster Posted August 27 Share Posted August 27 It is plausible that this might be the underlying reason, and I find it astonishing that a skilled technician would not have inspected all the pulleys, idler wheels, and tensioners for any issues prior to installing a new belt. The crucial aspect of it is the word "competent"! Link to comment Share on other sites More sharing options...
Captiva Posted August 27 Share Posted August 27 I agree with AmericaMonster's suggestion. It would be advisable to seek out an other garage or technician. Most likely, the idler pulley is deteriorating. Replace both the idler pulley and the tension pulley. I had similar issue with my CLK car in the past. Link to comment Share on other sites More sharing options...
Syncephe Posted August 27 Share Posted August 27 However, it fails to provide an explanation for the oil. Presuming it is lubricating oil for an engine. Is there a problem with the front seal of the crankshaft? Link to comment Share on other sites More sharing options...
Micobe Posted August 27 Share Posted August 27 Oil may also escape from the oil test port located in front of the engine. This hole is sealed by a square rubber gasket positioned right above the belt tensioner. Do these automobiles have problems with harmonic balancers as prior models from Mercedes-Benz used to? Link to comment Share on other sites More sharing options...
Radiantecon Posted August 27 Share Posted August 27 Typically, if a belt tears apart shortly after being started, it indicates that the belt was not installed properly and was slightly misaligned with one of the pulleys. I have personal experience with this issue, however I choose not to elaborate on how I acquired this knowledge. It is possible that a pulley has seized, but this would be apparent during installation. Additionally, pulleys are not very sensitive to oil, so it would not fail quickly. It would take a significant amount of time and slippage before it eventually fails. Link to comment Share on other sites More sharing options...
Anhartic Posted August 27 Author Share Posted August 27 The substance in question is motor oil. The crankshaft front seal or the top valve cover may be the source of the issue, maybe caused by a deteriorated rubber gasket. Link to comment Share on other sites More sharing options...
Anhartic Posted August 27 Author Share Posted August 27 Are these the two pulleys that I require? Link to comment Share on other sites More sharing options...
Wordcar Posted August 27 Share Posted August 27 I discovered the similar method on the CLK... Link to comment Share on other sites More sharing options...
Micobe Posted August 27 Share Posted August 27 Purchase a pulley from reputable companies such as INA, Gates, SKF, or an authentic MB component. Link to comment Share on other sites More sharing options...
depofly Posted August 27 Share Posted August 27 Prior to commencing, inspect the bolts used to secure the pulleys. It is worth noting that the M113 engine has a Torx T50 security bolt for the tensioner pulley. The parts are not readily accessible. Not an ideal revelation to make in the middle of the task. Link to comment Share on other sites More sharing options...
NarrativePsych Posted August 27 Share Posted August 27 This should have been the first item to be retrieved when changing the belt for the first time. I'm enquiring about the intermittent seizing of the air conditioning compressor Link to comment Share on other sites More sharing options...
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