Issue with Body Mount on a 2017.

I did a search but did not see anything similar so thought I would do a FYI post on what I experienced so others are aware incase this is not an isolated incident.

A couple of weeks ago driving home heard what sounded like a bolt, washer or some kind of fastener fall off from the passenger side. Stopped and did a quick check and did not see anything that stood out so continued home. Truck drove and handled fine and did another look at the front and rear suspension and did not see anything. I did notice what sounded like when the rear end stubber hits the frame when encountering dumps and figured was going to do the oil change and tire rotation myself that coming weekend (as tired for the dealership bs) and I then could do a thorough inspection.

Was going to drop the TRD Pro skid to fix it from when the dealership screwed up the bolts from the access door but when I looked at it closer only one of the bolts was screwed and not sure how to press the sleeve out to install the new one so just will live with 3 or the 4 bolts for now. I then made sure all the rest of the fasteners were there and checked them all for make sure they were tight. So, I did the oil change and upgraded to the aluminum filter housing from the plastic one and installed the Valvomax plug.

Jacked up the front and back and got the jack stands setup so I can do the tire rotation and that is when I found what I heard earlier in the week. The passenger side rear body bushing nut and washer was gone so that was what I heard. Looking closer the bolt broke do to it rusting.



So thought about taking it to the dealer but figured the truck has 51 thousand miles and I would just get the run around and more aggravation that I really wanted to deal with. Plus, with the weather getting colder wanted this taken care of sooner than later as not to cause other issues.

I went online and hunted down what I needed. I was going to just pickup some similar fasteners and not deal with the OEM ones but seeing the OEM ones have a flange as part of the bolt to help tighten it I just went with OEM

Placed an order for:

2 – Frame Rail Bolt – 52217-0C160
2 – Lock Nut – 90177-A0012
2 – Cab Mounting Stopper – 52216-0C020

Just be aware there is another frame Rail Bolt listed - 52217-0C120 and it is about 2 1/2 inch shorter and will not work with the rear body mounts.

My thought was if one side rusted out might as well address the other side as I am sure it would fail as well. Plus, having the rear seat out anyway made sense to replace the other one.

With the seat out each side has an access hole for the bolt that has a cover over it.



I just pried it up to remove it and you then have access to the bolt.



As you can see it was not secure and loose.

This is the passenger side old one and the new one under it.



As you can see with the rust it got weakened and broke.

Here is the driver side new one and old one.



A closer shot and as you can see it would have failed eventually as well.



Installed new bolts and nuts to both sides and could not find a torque spec for the 2017 so looked and other specs for body bolts and went with that. I will circle back in a few days to make sure they are good. With the flange on the bolt it locks to the tabs on the body so don't need to pullout the seat again.




Here is a passenger side shot of the nut and "stopper" after replacement.



Here is a driver side shot of the nut and "stopper" before and after after replacement. I decided to reuse the "stopper" as it was fine other than rusted.






I did not plan to do so much pictures and such with the post but as I started thought more info is better that less and usually have people saying .

This might just be a isolated thing that I ran into but thought I should put something out there. Not sure if do to the location is gets more road spray and more wet or if this was just a flaw with the bolt material or combination of both.

Really glad I decided to do the oil change and rotation myself and caught this. I wonder if the dealers "multipoint inspection" would have seen it?

Thanks for taking the time to read my rambling.

 

Great write up. Do you live in salt country? Undercarriage looks pretty clean for how bad those bolts look.

 

I live in Northwest Indiana and the truck is parked in the garage and not outside in the elements.

 

This x2

 

great informative post. thanks.

 

Looks like a great place to re-use those silica packs, that come in parts boxes, to absorb the moisture and minimize corrosion to the bolt. I did a body lift on a 2003 4Runner and it's bolts were 1000X better condition than your 2017 bolts....

 

A big thank you for sharing this @Brimaster

 

wonder if all our bolts like that are rusting away in the same manner.

 

a fellow region rat.. cant say i've seen those bolts rust so bad they've fallen out! subframe bolts on alot of the cars that come in look like that though when you remove them. salt is nasty..

 

Great write up! A couple suggestions that may help you out. Grease or never seize the bolts to prevent rusting. Maybe even add a thin coat of grease then put on shrink wrap tubing. I feel like this is one of those once in a lifetime issues so there is probably no need to do any of that though. Just wanted to throw the ideas out there for whoever may find use from it

 

Pics are good... Thanks for sharing

 

Thank you for sharing this information. Pics were helpful and certainly showed the rust issues. Random question here.......would spraying down these bolts with stuff like amsoil HD metal protector prior to insertion help or is that a waste of time?

Thanks for any follow up intel folks.