Thread: Hitachi compressor dryer cover red pilot air pipe connection

Dont be concerned by the height difference as you pull them to lock or push in to release and those caps are just clip on and come off easily.
I would start by servicing the compressor then see where you are error wise.

There’s nothing wrong from what I can see. Pull it out and disassemble the desiccant chamber and you’ll likely see the issue.

When it’s out slot the top bolt hole so you can much more easily get it back in. Saves a lot of time next time and on reinstallation.

Originally Posted by DiscoJeffster

There’s nothing wrong from what I can see. Pull it out and disassemble the desiccant chamber and you’ll likely see the issue.

I plan to. At the moment the error is only appearing sporadically 1/10th or less of the drives and even then it's only an Amber warning alert which resets with the car on/off, all height (Offroad and access) are still working fine the rest of the time. I'm going to order the repair parts first before disassembling for now.

From what I've read 4x4 Air Seals are a recommended supplier. Now just a matter of which kits to buy:
just the Compressor Air Dryer Filtration Repair Kit Discovery 3/4 -Oem Hitachi & Dunlop Air Suspension Compressor Air Dryer Filtration Repair Kit related to C1A2064 & C1A1364 Diagnostic trouble code - 4x4 Air Seals
or the Compressor Complete Exhaust valve seal kit Land Rover Oem Hitachi Air Compressor Complete Exhaust valve seal kit related to C1A1364 Diagnostic codes - 4x4 Air Seals
and should I be replacing the Air Dryer Cover while there Discovery 3/4 - Oem Hitachi Air Suspension Compressor Air Dryer Cover Repair Kit related to C1A2064 Diagnostic codes - 4x4 Air Seals
or while it's out, do the full hog Master Repair Kit with all components in there - Land Rover Oem Hitachi Air Compressor Master Repair Kit C1A2064 & C1A1364 Diagnostic Codes - 4x4 Air Seals

Originally Posted by DiscoJeffster

When it’s out slot the top bolt hole so you can much more easily get it back in. Saves a lot of time next time and on reinstallation.

Handy recommendation, thanks.

I would do the whole kit and be done with it. I found that the exhaust valve wasn’t the issue on mine and was the desiccant canister, twice.

Originally Posted by DiscoJeffster

on mine ... was the desiccant canister, twice.

Does that mean the replacement desiccant canister just didn't last very well or you've done significant use that you needed to replace it again?

If you are doing the job, i would also buy a new cap as i have had 2 crack between the both red/blue fittings. I tried all the 2pack glues etc but in the end just purchased a new cap and all good.

I did the total rebuild about 2 years ago and all still going fine.

Bulletman

Originally Posted by Bulletman

If you are doing the job, i would also buy a new cap as i have had 2 crack between the both red/blue fittings.

Yep, I figured since I'll already be going in there and removing this I would replace the cap too. While mine seems to be fine at the moment the fault is just too common not to do it as preventative maintenance at its current age.

I bought the 4x4 Seals complete "master" kit to service the Hitachi pump in RRS

In their instructional information they warn against unnecessary replacement of the relief valve as the housing is easily damaged. Although I bought the relief valve I didnt use it. That was about 3 years ago and has been working fine
Also be cautious when prising the ring retainer off when replacing the ring seals. I managed to snap the crown off the piston! Luckily I found a new replacement piston with crankrod and wrist pin from a supplier in USA

The main issues are the pulverised desiccant bead dust working its way through the system and the dryer lid failing. . The front control valve was the main fault with mine due to powdered desiccant in the valves