flexplate nightmare!

Squirt

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I have a 99 4 runner 3.4 automatic sr5...why do the flexplates continually fail??I'm installing the second one and follow the advice of a friend that works at Toyota and ordered the Toyota OEM flexplate bolts. but why do they continually fail... any advice???
 
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Its somewhat of a known issue that they can crack on this vehicle. Some go for 400k miles and never fail. Like stated mine has not failed and just tipping over 240k mileage. Was the replacement a used or new oem?
 
mine went out at around 180k, due to a bad remaned starter
lost 2 teeth, replaced the flexplate and starter with a used OEM ones, hopefully these will last a while
 
flexplate nightmare

well Doc You're lucky you've never had a problem with one..this is the third one that I know of in this vehicle.. second since I've owned it.I have a good Bosch starter,the flexplate is OEM bolts OEM, its a daily driver, nothing lifted, not a Stumpjumper and doesn't get abused.my dad is a pro mechanic and I helped with the install so I witnessed the work getting done correctly.he and I are just both totally baffled at why it keeps occurring when everything stays properly maintained and has been installed correctly.when you talk to Toyota all they say is "make sure it's a new flexplate that you installed and that you used Toyota bolts for the flexplate" that's all they've got, they have nothing else as a solution.to me those bolts alone should not make the difference when everything's properly torqued.the bolts we took out of the flexplate and torque converter this time around were just as tight as the day they were installed.:redbrick:
 
cracks around the center of the flexplate..the last one sheared completely out. this time I heard the same noise starting again and dropped the transmission before it could shear out.
 
well doc what starter do you suggest?
btw..thank you for your service....

OEM OEM OEM.

I know I posted my flexplate is good but just noticed a noise last night. Jumped under truck and I can hear a pretty bad noise coming from flexplate area. Dont make sounds at idle but does when revving. Sucks because it has to happen when its getting cold.
 
well doc what starter do you suggest?
btw..thank you for your service....

Again, OEM.

There's something you need to know about the 4Runner:

It HATES anything NON-OEM.

Spark Plugs, ONLY NGK or DENSO.

02/AF Sensor, DENSO

Parts, ONLY OEM STUFF.

Oil, doesn't really matter, but PARTS need to be OEM.

These things will run with NON-OEM, but they HATE IT.

And Thank You. Wouldn't give it up for anything.
[MENTION=59542]Singtoe[/MENTION]: Think you can help this guy out.
 
yes I have found that to be true with other parts also. was pretty sure you would suggest OEM starter but I would have been an idiot not to ask! that's how you learn stuff right;-)
so I wonder what the big difference is between how the oem vs "other" starters affect the flexplate ? i understand how they engage the flexplate etcetera..but I wonder what it is about the non-oem starter that causes the flexplate to crack ....any thoughts?
 
The slightest thing being off will cause that thing to break.

It constantly rotating, and the forces on it are pretty extreme.

Just it being unbalanced can cause it.

The starter not being shimmed right, close enough for their specs, but not Toyota specs, ect. There's a million things.
 
I always go with OEM toyota. Even used TOYOTA parts are far far far superior than any brand new aftermarket part.
 
yeah kinda answered my own question right after I typed that..makes all the sense in the world though.
 
well. You don't happen to have a starter laying around do you...what sites would you suggest I search for an OEM starter? just do not want to go to the dealership and buy one and you know as well as I do that some of these sites that are selling OEM parts are iffy.you're being a great help by the way I do appreciate your input.
 
The slightest thing being off will cause that thing to break.

It constantly rotating, and the forces on it are pretty extreme.

Just it being unbalanced can cause it.

The starter not being shimmed right, close enough for their specs, but not Toyota specs, ect. There's a million things.
suggestions for online sites selling OEM parts that are legit?unless of course you have a starter laying around?
 
TRDparts4you IIRC.

Your dealer. I know there's one in Raleigh.

As [MENTION=85046]nissanh[/MENTION] said, I've had some good experience with junk yard starters.

Actually, still running one two years after I swamped my truck.
 

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