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+--- Thread: Cat c15 IVA (/showthread.php?tid=10026)
Cat c15 IVA - davidjrawls - 03-19-2025
Needing the orings for the pistons on the Iva housings for an c15 acert Iva housing. Goes in the groves where I’m pointing in the picture. Cat says I have to buy the whole housings. Hopping someone has ran into this already.
RE: Cat c15 IVA - Btech - 03-19-2025
Cat decided all the IVA housings are non-serviceable other than changing the solenoids, so no official parts are available for what you want.
Your best bet would be to go to a hydraulic service/repair shop and see if they would have any orings that would be the right size, I imagine they are a viton oring with the pressures they could see on the piston.
RE: Cat c15 IVA - Rawze - 03-20-2025
Hopefully this is not during one of those attempts to modify the IVA valve operations... If you value your head gasket and engine that is.
Many a moron has modified them to be permanently closed during a de-mandate, only to find out the hard way that it is NOT a good idea ... unless ....
They can be modified to be permanently closed and run the engine at 19:1 compression ratio full time, .. but that also requires the boost to be turned down to 33-34 psi max too. Allowing the boost to go above this = excessive dynamic compression ratio and engine/head/gasket damage.
RE: Cat c15 IVA - davidjrawls - 03-20-2025
Just trying to get them all back in working factory order. Without having to spend 4k on housings just because I need rings.
RE: Cat c15 IVA - trucklogger2 - 03-22-2025
(03-20-2025 )davidjrawls Wrote: Just trying to get them all back in working factory order. Without having to spend 4k on housings just because I need rings.Maybe try Adept Ape on YouTube (Josh) he’s a long time cat mech very informative. He’s talked Aa lot about those.
RE: Cat c15 IVA - greengoat01 - 05-02-2025
(03-19-2025 )davidjrawls Wrote: Needing the orings for the pistons on the Iva housings for an c15 acert Iva housing. Goes in the groves where I’m pointing in the picture. Cat says I have to buy the whole housings. Hopping someone has ran into this already.
This is a couple months old, do you need the o-ring part numbers?
Cat O-Ring numbers (good numbers)
2= 221-9937
2= 221-9941
Cat back up ring numbers (N/A)
2= 221-9942 dimensions= OD 23.78mm x ID 21.08mm x 1.24mm thick
2= 221-9940 dimensions= OD 25.36mm x ID 22.68mm x 1.24mm thick