Questions for Fox shock experts -

Jetboy

New member
So I've been running Fox 2.5 Factory coilovers for about 3 years. They're swapped over from an FJ Cruiser/120 version. The problem I'm running into is the remote reservoir placement doesn't work on the passenger side. I chopped up the FJ cruiser mount and can make it fit just about anywhere because I have KDSS - so there's no sway bar to deal with where it's normally an issue.

My problem is that the reservoir hose is too short to orient the reservoir in a good place where it doesn't rub on the inside of the tire and full steering lock. They're mounted basically like this picture (not mine), but they rub, even with my street tires.

IMG_5743.jpg~original


This is how I had them mounted for a few years, but the hose is just too short to really work and the UCA ended up causing enough movement to be a problem. This location works a lot better for rub, but I need more hose. Or I would maybe just mount them in the engine bay along the firewall or something if I added long hoses.
radflo-tc-complete-jpg.544989


So I thought - Fox uses re-useable high end hose components on the Factory series - I'll just buy a little extra hose and mount them where I want. Well... the house of hose didn't have anything that's compatible. The hose that matches the labeling on the Fox hose is something different from what's on there. I thought it was standard 10AN hose, but the high pressure 10AN hose doesn't fit physically inside the Fox hardware. So question 1 is: does anyone know what the correct spec for generic hydraulic hose that is the right stuff is? Basically what's it called?

Second - Any tips on breaking loose the top had machine screw? The one that has an hex key. I broke my ratchet off and didn't get it loose after trying with an air impact and also failing. I can't disassemble the shock without getting it apart to do a rebuild internally. Should I heat it up locally around the threaded area? Otherwise I'm kinda out of ideas on this one. Stainless bolt into aluminum doesn't play well together. It's pretty well seized in there.

Third - is any 7wt oil compatible, or do I need to buy Fox JM92? My UCA was hitting the hose in it's old position and ended up moving it enough that it actually loosened the fitting and broke the seal, so it leaked. I couldn't get JM92 or get the damn thing apart to properly bleed anyway - so I did my best field bleed and charged it up for now with just 200psi of compressed air (I used my bicycle shock pump to get to 200psi). For a temporary fix it seems to work fine, but I'd like to know if I need to order Fox brand oil.

Finally - am I just wasting my time and $ messing with it and I should just send them to Fox for a factory servicing? For $125 each they'll do a rebuild and I could just pay them to replace the hoses at the same time and let them figure out how to get that bolt out.


Thanks!
 
Last edited:
Register to hide this ad
No shock expert, i do have a little experience with hydraulic hoses, i could be wrong but looking at what pressure these systems use is only ~200 psi, you should not need high pressure hose for that little pressure, 3/8’s to 1/2” high pressure hose limits out at like 4000 psi.

You could go to gates.com and see if they have anything that can match what you looking for.

I would want to rebuild them myself just for the experience but if they’ll hook you up with new stuff you can’t get a hold of I guess it would be worth sending them in.
 
Last edited:
I was also thinking low pressure hose might be just fine. The problem is more of the size to fit properly in the fittings. Fox uses nice stainless threaded fittings that should be easily reusable with the right hose diameter. The correct ID hose was too thick to fit inside the outer part of the fitting if I used the high pressure hose.

I need to do some quick math on the pressure. Basically the floating piston separates the oil from the gas in the reservoir. And it allows for the volume of the piston rod as the shock compresses. If the compression of the cylinder shaft moves 4 inches - I think that's pretty close guess - it would need an additional roughly 10 cubic inches of volume to compress the gas in the reservoir. If the gas in the reservoir chamber starts at 120ish cu. inches at 200psi and compresses to 110cu in., the pressure would be about 220psi. I don't know how much pressure is generated by the actual dampening, but the orifices are the same on both ends of the hose, so there shouldn't be an unusual pressure in the hose its self on compression, but it might spike when you hit a bump. I need to think through it a bit more.

Either way - I'd really just like to find the same or comparable hose somewhere that's not $100 per foot.
 
Finally - am I just wasting my time and $ messing with it and I should just send them to Fox for a factory servicing? For $125 each they'll do a rebuild and I could just pay them to replace the hoses at the same time and let them figure out how to get that bolt out.


Thanks!

I would send them out. I messed with my 2.5's on my titan a few times. Cross threaded the adjustment collar, Removed the top hat because Fox assembled them with the bolt pattern for a different truck, moved the 90 fitting so my UCA wouldn't hit it, etc. and they were a pain. You might as well just have FOX take care of all of it. Just be specific on the mount of hose you need and if you need 90's or not. FOX is spotty in customer service though, maybe send them to SDHQ in Arizona.

And yes, the top hat bolt was a HUGE PAIN. had a lot of red loctite lol. It was also cross threaded. When i put it back together i made the decision that i would never take it apart again lol.

IDK how far you are from Nevada/Vegas area but theres a couple Tundra shops that could definitely rebuild them for you. MCMFab is one, he's pretty well known on TundraTalk
 
I would send them out. I messed with my 2.5's on my titan a few times. Cross threaded the adjustment collar, Removed the top hat because Fox assembled them with the bolt pattern for a different truck, moved the 90 fitting so my UCA wouldn't hit it, etc. and they were a pain. You might as well just have FOX take care of all of it. Just be specific on the mount of hose you need and if you need 90's or not. FOX is spotty in customer service though, maybe send them to SDHQ in Arizona.

And yes, the top hat bolt was a HUGE PAIN. had a lot of red loctite lol. It was also cross threaded. When i put it back together i made the decision that i would never take it apart again lol.

IDK how far you are from Nevada/Vegas area but theres a couple Tundra shops that could definitely rebuild them for you. MCMFab is one, he's pretty well known on TundraTalk

What is the situation in PHX? Who can rebuild what shocks reasonably well? And what is a typical ballpark cost these days? Thanks!
 
If you are going to go through the hassle of sending them out to have rebuilt then you may want to consider sending them to AccuTune Off-Road | Drive Like a Pro. These guys are Fox gurus, are much easier to deal with then Fox, and could do some custom valving that could help performance. I'm sure they could also do any hose corrections that you might need. They are very 4Runner knowledgeable too!!
 
Why don’t you adjust the position of the 90 off the top of the shock? Most high pressure fittings are not npt and use a compression ring to seal the threads. Don’t cheap out on low pressure hose. Always use high pressure hose rated for hydraulics. If you’re questioning your ability at extracting the bolt, and think you might wash out the threads in the housing. Send it in. Maybe the last guy used locktite and it needs heat, maybe not. Or soak it. Use low wide heat, maybe once or twice and try the hex again. But I wouldn’t send it in all burned up...
 
Old thread. Here's some updated info for the DIY shock folks:
Fox Shock Hose and Fitting Info.

Fox Factory 2.5 front Coilvoers

Hose - "13/32 or 10mm 100R5" Also commonly called "100R5-08"

Fittings- JIC size 8 ends or -08AN

Contrary to what I found by searching on other sites - -10AN/JIC10 is NOT the right size and 1/2"/12.7mm hose does NOT fit
 

Members online

Forum statistics

Threads
278,309
Messages
3,554,070
Members
248,016
Latest member
Advally Service

Trending content

Back
Top