Odd LCA bolt Observation Today. Thoughts? (1 Viewer)

[Boston Mangler]

Sooooo

Got truck in a million pieces

Truck is high mileage, but has been in SoCal its entire existence. There is not a spec of rust anywhere.

But…. Replacing LCAs today. Front bolts on both pass and drive side look perfect, come right out.

Rear 2 on both sides were rusted to all hell and looked like they been sitting at bottom of ocean 20 years. Weren’t “frozen” and came out with some extra Ugga Uggas…

I bought new ones ahead of time after reading the horror stories, and they’re all in and it’s done.

But super curious about what might of caused the gnarly rust on 2 of the 4 bolts. Nothing else around it whatsoever has any rust anything.

LCAs are original, so the 2 non rusted ones have never been replaced

Random head scratcher

Ideas?

 

[TheBussman]

I'm not sure but it is quite common. how did the sleeves look? those are usually worse then the bolts.

 

[TeCKis300]

Super common. Most of the time, outside of the arid region, it's to the degree that it's completely corroded and frozen such that there's no hope of backing it out at all. Only way to remove the LCA is to destructively cut through the sleeve and bolt.

It's a common Toyota thing and it's not clear if it's a lack of coating, dissimilar metals, those spots are prone to moisture and corrosion, or all of the above combined.

The forward bolts are somewhat different than the rear positions in that the eccentric assembly completely sleeves the bolt which probably helps seal the threads away better?

 

[Boston Mangler]

I'm not sure but it is quite common. how did the sleeves look? those are usually worse then the bolts.

Yes, they just as bad, maybe worse.

Luckily I bought all those too and had them on hand

 

[Boston Mangler]

Super common. Most of the time, outside of the arid region, it's to the degree that it's completely corroded and frozen such that there's no hope of backing it out at all. Only way to remove the LCA is to destructively cut through the sleeve and bolt.

It's a common Toyota thing and it's not clear if it's a lack of coating, dissimilar metals, those spots are prone to moisture and corrosion, or all of the above combined.

The forward bolts are somewhat different than the rear positions in that the eccentric assembly completely sleeves the bolt which probably helps seal the threads away better?

Excellent explanation (as usual) that makes sense now.

Thank you.

I was assuming the frozen ones were from rust prone areas like east coast.

My trucks back home were a nightmare to work on because everything rusts fast because of the salted roads

 

[bloc]

You probably noticed the front and rear bolts have different ways of mounting.. I think the way they are configured on the rear bushing and sleeve just traps moisture from simply driving in the rain.

 

[Boston Mangler]

You probably noticed the front and rear bolts have different ways of mounting.. I think the way they are configured on the rear bushing and sleeve just traps moisture from simply driving in the rain.

I did notice that. Now that you guys mention that, makes perfect sense.

I was totally stumped when I pulled em out

Thank you

 

[scooterp7]

I had the same issue on my GX470. Absolutely no rust anywhere. While rebuilding the suspension, the passenger front LCA bolt would not come out. I used a saws all to cut it out. The explanation make sense, thanks. If you put enough pressure on the eccentric you find out it is actually 2 pieces.