Thread: EAS valve block rebuild - frustration!

Originally Posted by davidsonsm

Was really careful 2nd time around to label and mark everything. The front has dropped over night with the eas delay switch isolated. Does that reveal any more?

Hi

I would say that eliminates the EAS computer and points squarely to mechanical leak and since it is only the front one would think it must be a non-return valve.

It's amazing how a smear of vaseline can make those o-ring suckers seal

Good luck
Steve

I'll take a look at the nrv's on my return from a trip to NSW for a conference. Need her back on her feet for wombat this weekend.

Just been for drive and after ten or so minutes she raised but within 5 mins the front had dropped again. Arh. Thinking the nrv's are most likely suspect. Bugger. I'm an expert at whipping out valve blocks now.

Just a thought maybe worth having a good look at seat for NRV's in case of damge .ie. scratching, pitting causing a potential bypass situation??

NRV's in the wrong way are a certain cause of drooping bags.
Solenoids operate in a fail-close mode. If no power/magnetic field applied they should seal.
O-ring lube or vasoline on all rings except the NRV's is good practice.
Soapy water test around the base of the solenoid housings will show if the 1mm o-ring on the shaft is leaking.
Also spray the tops of the air springs where the air lines go in. If you used my o-ring kit, there are extra 6mm o-rings to replace those in the top of the air springs.

Noticed in your pics on the snorkel thread that you are using the black and blue tee-pieces. I don't trust them after we had some problems with them on the HRA EAS Emergency Bypass Kit. Swap them for the black or white/black units. I might have a few still lying around. Did you re-check with he soapy water test?

I'll investigate further on Friday. Away at the moment. Paul I know what you mean about the blue and black push fit fittings. I had one fail on my schrader receiver inlet point. Not sure they are rated high enough. Appreciate the pointers. I'm favoring something wrong with the nrv's.

Can anybody tell me if there is supposed to be a spring under the "red" nrv (per Paul's schematic). The Nrv that faces the opposite way. I found a spring inside the block pushing against the seat/cone end if the valve. Never noticed it before when rebuilding the block. I had a look at the other block I rebuilt as a spare and it doesn't seem to be there?

So. I've had the valve block out twice today. First time I found a pinched o ring on the front right solenoid valve stem. Also found that spring? Left it out. Pretty sure it shouldn't have been there.
Went for drive and all seemed well fir about half an hour. But gradually the front end began to drop until it was eventually on its bump stops - just the front.

I then pulled it out again and went through the NRV's again along with the front two solenoids. Nothing obvious this time but hopefully it's fixed. It's up on high setting now and doesn't seemed to have dropped. Hopefully it'll get me to and around wombat state park tomorrow.

After a test drive its back on its bump stops. To say this is annoying is an gross understatement.