Beware: Aisin timing belt kit deficiency
09-18-19, 05:41 PM
#31
Lexus Champion
Thread Starter
I had ZERO issues with my AISIN timing belt kit on my 97'. Stop spreading this misinformation. Why are you removing the belt after 50 miles? This isn't normal. It sounds like you didn't plan properly and are wasting twice the amount of labor. Also, do they claim you can use the timing marks multiple times? Installing the belt the first time for 90,000 miles should be the proper procedure had that major service been done correctly.
Lexus parts pulled a tensioner bearing from their shelf and the exact same bearing P.N. as in Aisin kit....
The new bearing clearly had less side play than mine, however it still had some.
It is my position. It should have none.
The idler bearing does not demonstrate any play.
Was experiencing slight bearing noise in front of engine compartment.
All my serpentine belt driven accessories, brackets and bearings are like new..and removed belt to isolate the noise back to the timing belt components...which had been serviced we with the Aisin kit.
I inquired and was informed the tensioner bearing is a superceding P.N. because the original.was discontinued.
Superceding P.N.s have not always been improvements..
Not here to complain but perhaps someone with more information than me can explain this.
Thanks..
09-20-19, 01:03 PM
#32
I am a mechnical engineer with a few decades of experience. A play free ballbearing in an assembled idler roller is not a good idea.
They have the best chance to last if they have a very small noticeable play. Then you know it is not to tight.
No play typically means that the bearing is tight due to the press fit and may get a shortened life. I have exchanged bearings for that reason alone.
It is a game of probabilities . Rule of thumb is that 50% of bearings survive 5 times as long duty as the worst 10% does.
They have the best chance to last if they have a very small noticeable play. Then you know it is not to tight.
No play typically means that the bearing is tight due to the press fit and may get a shortened life. I have exchanged bearings for that reason alone.
It is a game of probabilities . Rule of thumb is that 50% of bearings survive 5 times as long duty as the worst 10% does.
09-21-19, 08:57 AM
#33
Lexus Champion
Thread Starter
I am a mechnical engineer with a few decades of experience. A play free ballbearing in an assembled idler roller is not a good idea.
They have the best chance to last if they have a very small noticeable play. Then you know it is not to tight.
No play typically means that the bearing is tight due to the press fit and may get a shortened life. I have exchanged bearings for that reason alone.
It is a game of probabilities . Rule of thumb is that 50% of bearings survive 5 times as long duty as the worst 10% does.
They have the best chance to last if they have a very small noticeable play. Then you know it is not to tight.
No play typically means that the bearing is tight due to the press fit and may get a shortened life. I have exchanged bearings for that reason alone.
It is a game of probabilities . Rule of thumb is that 50% of bearings survive 5 times as long duty as the worst 10% does.
Noisier than sleeve bearings but considerably longer life.
This tensioner bearing has excessive play such that you can see the bearing seal discernibly crinkle when applying side pressure....
Right now the bearing is at Lexus...since it is the same bearing P.N. as Rock Auto, have requested they discuss the issue with Toyota...
A superceding part raises questions.
10,000 miles is too few for such loosening...and this bearing is probably the noise culprit.
Images of original.P.N. 1350550030:
Image of original tensioner pulley P.N. 13505-50030
Superceding P.N. appears on Lexus Dealer website...
Last edited by YODAONE; 09-21-19 at 11:33 AM.
04-30-20, 11:39 PM
#35
Lexus Champion
That's interesting, I may have to buy a Lexus belt and compare now. I will say though that you do not need marks to do a timing belt, in fact many cars do not have marked belts and customers very often choose very cheap stuff from dayco/gates and you have to simply install them correctly.
Ive not messed one up yet but I do prefer marked ones for my own car due to how easy it is.
Ive not messed one up yet but I do prefer marked ones for my own car due to how easy it is.
05-01-20, 07:41 AM
#36
Lexus Champion
Thread Starter
That's interesting, I may have to buy a Lexus belt and compare now. I will say though that you do not need marks to do a timing belt, in fact many cars do not have marked belts and customers very often choose very cheap stuff from dayco/gates and you have to simply install them correctly.
Ive not messed one up yet but I do prefer marked ones for my own car due to how easy it is.
Ive not messed one up yet but I do prefer marked ones for my own car due to how easy it is.
The markings on the Toyota marked belt last much longer.
Compare for yourself and share your findings.
01-05-22, 01:35 PM
#37
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Wheres the best source for OEM a timing belt 'kit'? Ive called around to a few dealerships and they dont sell kits....just the parts separately. And they add up to more than twice what aftermarket kits are going for.
01-05-22, 01:36 PM
#38
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Wheres the best source for OEM a timing belt 'kit'? Ive called around to a few dealerships and they dont sell kits....just the parts separately. And they add up to more than twice what aftermarket kits are going for.
01-05-22, 01:50 PM
#39
Lexus Fanatic
Google Aisin TKT021 there is nothing wrong with the Mitsuboshi timing belt that comes with the Aisin kit.
01-05-22, 02:47 PM
#40
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01-05-22, 02:54 PM
#41
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01-05-22, 03:44 PM
#42
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01-06-22, 03:09 AM
#44
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Out of all the parts that are included in the Aisin kit, which are the most critical or prone to failure? Im tempted to buy the belt and maybe the water pump from the dealer to be sure theyre 100% OEM toyota.
01-06-22, 10:27 AM
#45
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I was talking with a lexus dealer earlier and he said they source their parts from a variety of manufacturers. Aisin being one. Looking at the pics above, where can I get ahold of one of the green printed Toyota belts? I dont want to order one from a dealer and it turn out to be a Aisin one I could have gotten a lot cheaper online.