Re: Restauration Indy 4900
Publié : mar. 23 juin 2020 20:38
En attendant le passage à la clinique Valenti, quelques infos utiles glanées sur F-chat sur la durabilité et le changement éventuel de pièces du circuit LHM.
On met à part, bien sûr, les sphères: les deux de freinage qui ont déjà été reconditionnées et l'accu du CJDJ à changer.
Voici les points que j'ai soulevés sur F-chat auprès des utilisateurs de circuits LHM et les réponses apportées qui me semblent bien à propos.
Je les recopie ici pour documenter l'info.
1. CJDJ et doseur
From reading in Citroen fora, I understand that the bodies of the "passive" essential components that are the CJ/DJ (piece Nr. 170) and the "doseur" (piece Nr. 175) may remain functional for extensive periods of time as they are housing only small metallic parts and rubber/nylon seals immersed in hydrophobic LHM.
In principle it is therefore quite unlikely to have such components becoming dysfunctional over time unless a part is unexpectedly breaking or a channel inside the body becomes clogged because of impurities or of LHM long ageing.
On such components, (limited) wear comes mainly from hydraulic flow, which is essentially linked with the actual use of the braking system and mileage of the car, not the case of my low mileage car that was stored for a very long time.
Gunk from LHM sitting still for very long times could however not be dismissed.
Do you think that a reconditioning of the CJDJ and doseur should be considered as a precautionary measure or would that be overkill?
2. Pompe
Same question for the LHM pump, which seems however to function correctly.
3. Durites
Then the issue of hoses in the high and low pressure circuits.
The HP part is the most important of course and should be 100% reliable while the LP hoses only ensure the flow back to the LHM reservoir.
All the hoses seem to be original. Should they be all replaced or only the HP ones?
4. Tubes en métal
Wrt the metal tubings of the HP circuit, they seem to be corrosion free; should they be replaced also or could I consider that they are safe enough?
Et voici les réponses apportées:
" If you use your LHM Maserati regularly, most seals and components will not dry out or corrode or fail suddenly. My experience is your most common symptom will be dripping LHM, and you trace the leak to a cracked or worn seal. Then you repair the problem. Such leaks can occur at any part of the LHM system. I do not try predicting what to repair or replace before a leak occurs unless the 'Lo Pressure' light tells me.
More specifically:
1.) You are correct. Parts 170 and 175 are rarely in need of any reconditioning if they are functioning normally. I have not had mine served, repaired, or reconditioned.
2.) The LHM pump will give you trouble when it is worn out. I do not recall the symptoms, but dry, cracked or worn seals probably introduce air, and the pump will activate and work much more frequently to keep pressure (you hear the Click-CLACK-run-run-run-Click-CLACK! sound often). Mine needed reconditioning after being neglected for 22 years. That was 9,000miles ago.
3.) My HP hoses are all original. I inspect the car each season. I do not plan on replacing them as a precaution.
4.) Metal tubing will not corrode from the inside. If you see corrosion on the outside, it seems reasonable to replace them."
En conclusion, mon opinion à ce stade:
- changement de l'accu de CJDJ par un neuf, de préférence un multimembrane d'origine Citroen;
- inspection soignée de tous les tubes et durites et changement en tant que de besoin;
- inspection des étriers de freins, notamment du bon coulissage des pistons, et réfection si nécessaire;
- purge soignée; et
- test routier pour vérifier le bon fonctionnement du CJDJ, de la pompe et des freins.
On met à part, bien sûr, les sphères: les deux de freinage qui ont déjà été reconditionnées et l'accu du CJDJ à changer.
Voici les points que j'ai soulevés sur F-chat auprès des utilisateurs de circuits LHM et les réponses apportées qui me semblent bien à propos.
Je les recopie ici pour documenter l'info.
1. CJDJ et doseur
From reading in Citroen fora, I understand that the bodies of the "passive" essential components that are the CJ/DJ (piece Nr. 170) and the "doseur" (piece Nr. 175) may remain functional for extensive periods of time as they are housing only small metallic parts and rubber/nylon seals immersed in hydrophobic LHM.
In principle it is therefore quite unlikely to have such components becoming dysfunctional over time unless a part is unexpectedly breaking or a channel inside the body becomes clogged because of impurities or of LHM long ageing.
On such components, (limited) wear comes mainly from hydraulic flow, which is essentially linked with the actual use of the braking system and mileage of the car, not the case of my low mileage car that was stored for a very long time.
Gunk from LHM sitting still for very long times could however not be dismissed.
Do you think that a reconditioning of the CJDJ and doseur should be considered as a precautionary measure or would that be overkill?
2. Pompe
Same question for the LHM pump, which seems however to function correctly.
3. Durites
Then the issue of hoses in the high and low pressure circuits.
The HP part is the most important of course and should be 100% reliable while the LP hoses only ensure the flow back to the LHM reservoir.
All the hoses seem to be original. Should they be all replaced or only the HP ones?
4. Tubes en métal
Wrt the metal tubings of the HP circuit, they seem to be corrosion free; should they be replaced also or could I consider that they are safe enough?
Et voici les réponses apportées:
" If you use your LHM Maserati regularly, most seals and components will not dry out or corrode or fail suddenly. My experience is your most common symptom will be dripping LHM, and you trace the leak to a cracked or worn seal. Then you repair the problem. Such leaks can occur at any part of the LHM system. I do not try predicting what to repair or replace before a leak occurs unless the 'Lo Pressure' light tells me.
More specifically:
1.) You are correct. Parts 170 and 175 are rarely in need of any reconditioning if they are functioning normally. I have not had mine served, repaired, or reconditioned.
2.) The LHM pump will give you trouble when it is worn out. I do not recall the symptoms, but dry, cracked or worn seals probably introduce air, and the pump will activate and work much more frequently to keep pressure (you hear the Click-CLACK-run-run-run-Click-CLACK! sound often). Mine needed reconditioning after being neglected for 22 years. That was 9,000miles ago.
3.) My HP hoses are all original. I inspect the car each season. I do not plan on replacing them as a precaution.
4.) Metal tubing will not corrode from the inside. If you see corrosion on the outside, it seems reasonable to replace them."
En conclusion, mon opinion à ce stade:
- changement de l'accu de CJDJ par un neuf, de préférence un multimembrane d'origine Citroen;
- inspection soignée de tous les tubes et durites et changement en tant que de besoin;
- inspection des étriers de freins, notamment du bon coulissage des pistons, et réfection si nécessaire;
- purge soignée; et
- test routier pour vérifier le bon fonctionnement du CJDJ, de la pompe et des freins.
Je suppose qu'il faut rentrer dans leur communauté pour en savoir un peu plus...
).