How to Diagnose Oil Leak on Mitsubishi Magna Automatic

1. If you have noticed that there are oil spots, developing into a larger oil stain, under the engine area where you usually and regularly park your vehicle, it is worth a few moments to do some very basic tests to head off and avoid very expensive repairs. Place a large, approximately 1 meter square piece of clean cardboard or thick paper on the floor, under where the engine of your vehicle is located. This should be done after the vehicle has been for a ‘run’ and at operating temperature.
2.Periodically, say after 1 hour, then 2 hours, then overnight, the cardboard ‘carpet’ should be checked for oil spots. Of course, an engine and gearbox on modern vehicles should have no oil leaks. Vintage cars were notorious for oil leaks because of poor technology at the time. As a rough guide, here is a color code for different spots on your cardboard… Clear or watery wet could be fuel… Watery wet but colored blue could be radiator coolant…Black could be engine oil… Seal grey could be manual (stick) gearbox oil… Red oil spots could be power steer fluid or auto transmission oil… The reason for this article is about auto transmission oil leaks. If you have red oil spots, it could mean the auto gearbox has developed a leak. Mitsubishi auto gearboxes are manufactured in such a way as that the outer casing or shell is basically two halves bolted together. Where the two halves meet, there must be some kind of sealant goo of silastic to prevent the internal oil from leaking out… Mitsubishi, in their wisdom, used a type of sealant which, over a period of time goes brittle hard. The passage of time and the stresses of the (usually daily) heating and cooling of the vehicles engine will lead to the failure of this sealant.
3. Should you discover your vehicle has any leak of any kind, of course it is in your interest to have it inspected by a professional. If the diagnosis is the auto gearbox where the two halves of the casing join, it can be expensive, but much cheaper than if the gearbox runs low on oil and ‘cooks’ itself due to overheating through lack of lubrication. The fix procedure involves the draining then removal of the auto gearbox. The ring of bolts holding the two halves together can then be undone. The two halves can then (sometimes with great difficulty and perseverance) levered apart by approximately 10mm or half inch… (no more than that!) When levering it apart, great care must be taken to not damage the two mating faces. With it now slightly split, a scraper tool such as a modified steak knife can be used to remove the dried and cracked old sealant. With this out of the way, and the surfaces clean and free from any oil residue, new sealant can be applied. The best quality sealant available is the only way to go. Seek advice… The two halves can be bolted back together, having not dislodged the bearings from their seating slots… Refit the gearbox, and refill using only genuine Mitsubishi auto transmission fluid, for which you will probably need a bank loan. It is not known as liquid gold for nothing, but it is the only fluid to use in my experience. Other oils will fail and you will end up with a broken gearbox and back to square 1. Getting the oil level correct is also an art form.. Seek advice… So now you know… hope this helps






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