They are generally not visible when you open the bonnet as they are protected by metal or plastic covers to guard them from debris. As they have the same function, an engine will, generally speaking, be fitted with one or the other (there are a handful of engines that have both). Despite having the same functionality they are unique in their design and each of them has their own benefits as well as disadvantages. Timing chains and timing belts perform the same function, they connect the camshaft/s and the crankshaft to keep them rotating in-sync. Read on and all will be explained! What are timing chains and timing belts? I can believe the ink print used for "after market kit" vs "OEM/toyota/lexus" may be different but I would have hard time believing Mitsuboshi would create different production belt for the same spec belts (it would be more costly for them production wise to have such differentiation other than "printing").If you've ever bought a car, someone will no doubt have told you to "make sure you check when the timing belt was done" which is sound advice, but do you know what a timing belt actually is? and more importantly, why it's important to know what it does and when it was last changed. I did use the Mitsuboshi belt that came with the Aisin kit for another vehicle and it has not been an issue so far (50K+ miles, 3+ years). The Aisin Timing Belt Kit includes all relevant parts except crankshaft seal (highly recommended) and camshaft seals.ĭoes this help?That makes more sense. Unsure what action Aisin is taking to remedy this. Aisin's vendor swears it is off the same production line.however the registraruon marks on the spine of timing belt as provided by Aisin quickly wear off, while the belt purchased from Lexus holds markings after 80,000.miles, so should it become necessary to remove timing belt, it is more difficult to index on the crank and cam pulleys. YodaOne, based on this post, are you saying the Aisin timing belt water pump kit you purchased from RockAuto was not included with Aisin water pump? I've purchased Aisin kit from Rock Auto for another vehicle and the water pump had clear marking of Aisin on the water pump cover and it came in Aisin box so I would be surprised if you got different water pump, hence the qeustion.The Aisin Timing Belt Kit includes all relevant parts except crankshaft seal (highly recommended) and camshaft seals. Somewhat old post but I was planning to buy the Aisin kit from RockAuto so I wanted to ask the question. GMB is listed as South Korean.but based on my experience, question their quality the Japanese offer more consistent quality Swiss cheese casting.Aisin uses a solid castingĪNYONE WHO INSTALLED NON OEM water pump and timing belt components should have them checked at 15-20k.įound this on Nachi bearing website.Nachi is OEM supplier for AC clutch bearing. Unusual gap between impeller and housing.the fin shape appears off as well. GMB timing belt idler bearing.bad shape after 25k miles My guess is 5-10k miles tops.then destroyed engine. There was no way this replacement kit was going to last another 65,000 miles. The water pump gasket was ill fitting crap as well and did not seem to have rubber perimeter compression seal. The casting was cheap construction and was not a solid piece as was Aisin's. The pump impeller was no where near the confifuration of Aisin. The water pump bearings were also noisy.and the water pump had been leaking.perhaps because Mazda lost one bolt and failed to tighted another.m So I purchased a timing belt and water pump service kit from Rock Auto All OEM Aisin water pump with correct gasket, Mitsubishi timing belt, Koyo Idler bearing and tensioner pulley,Īfter 25K miles, both idler and tensioner bearings were shot.noisy wirh considerable side play. Googled the invoiced timing belt and water pump component P.N.'s which tracked back to Autozone. Perhaps on account that Mazda failed to replace timing belt tensioner The spine of the timing belt was thin and showed evidence of wear with considerable belt dust in cam covers. New OEM Alternator, power steering pump, Serpentine belt, tensione, idler pulley and fan bracket bearing. Prior to purchaseing my 99 LS400, I requested and was presented with a copy of a waterpump/timing belt service invoice as performed by a Mazda dealer in Panama City Florida.the owner apparently worked for the dealer.įast forward.after 25,000 miles I discerned bearing noise from within timing cover area.
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