Rockshox Monarch RL IFP?

[love2fly]

Hi shock experts

 

I bought a used Monarch RL here on the Hub a few weeks ago to use as a spare until I get mine serviced.

This one was at a reasonable price and had according to the seller been sent for a service (he thought to Cape Cycles - By his father...).

 

Ive just fitted it and cant get it to lock, which I understand could be a sign that the damper needs a service - Is that correct?

There is some "squelching" noise but it holds my 30% sag at the same pressure as my "old" RL).

 

I've read that it could need IFP pressure - Is that possible?

Can one check and add if necessary without complete dissasembly? - Provided one has the adapter. I understand that the valve is hidden behind the cover near the bottom pin?

 

Help would be greatly appreciated.

[DieselnDust]

i would not fiddle with the IFP pressure if  you don't have the correct tools and fittings and zero experience.

 

But not locking out shouldn't have anything to do with IFP pressure. 

[love2fly]

I have a fair bit of experience and good mechanical understanding. I've serviced my forks and done an aircan service on my other shock. I just want to know if it's worth checking the IFP pressure which if I'm right should be 500psi...it just needs an adapter and shock pump or nitrogen...

[love2fly]

.... Would just like a definitive clarification...

[love2fly]

Thanks that's the kind of in depth thoughts I was hoping for. ????????

[love2fly]

.... So after buying and selling for years on the Hub I finally got ripped off. Oh well....

[DR ◣◢]

Top tip when buying suspension anything. Ask for a copy of the last service invoice. Walk away if the seller can’t provide it.

[love2fly]

So far I've taken Hub sellers at their word.But there're face to face bullshi##ers here too. Lesson learned. I'll get my shock serviced and afterwards service this myself to learn.

[love2fly]

Just an update... Had a good chat to seller who agreed a mistake made re having been serviced. Seller has reimbursed me for cost of shock service. Am very happy and my faith in the Hub has been fully restored.

[droo]

IFP is short for internal floating piston, and the air pressure behind it keeps the damper oil under positive pressure so that the oil behind the piston doesn't cavitate at high shaft speeds. The bit that controls compression and rebound damping, and is responsible for the squelchy noise, is the damper, but for some reason many people refer to this as the IFP. It's not.

 

The squelchy noise you're hearing is because the damper oil is aerated, ie. air and oil have mixed inside the damper. Which means the damper has failed, and needs to be rebuilt.

 

Checking IFP pressure is impossible, because the amount of air that will escape into a pressure gauge is almost the total volume of air in the IFP chamber.

 

If the IFP has lost pressure, recharging it won't help either - if it's been ridden in that state, the oil will be aerated and will have to be replaced. This is also why dropper posts go spongy if you pick your bike up by the seat when the post is compressed - there's gas in solution in the oil, and this boils off under the vacuum created by pulling on the post. Spongy post, squelchy shock.

 

Much rambling just to correct a few semantic errors... but glad you got sorted anyways. Send it to Jacques at Cogent. He'll make right.

[DieselnDust]

The big challenge you wil now have is that if the damper shaft and air spring shaft are scored or have slight wear marks you will basically be in for a new shock because the service cost is going to be coming up to around R5000...

Still cheaper than a new unit but then you have a new unit

Something to consider

[love2fly]

@Droo & DieselInDust...

 

Thanks.

Its in for service at a trusted LBS so will wait and see.

 

Thanks to everybody for their comments.

 

Cheers