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HONDASERVICE7791
HONDASERVICE7791, TECHNICIAN
Category: Acura
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MDX: Acura MDX power steering makes whining noise. Replaced

Customer Question

Acura MDX power steering makes whining noise. Replaced o-ring twice. The noise went away for two weeks. Then it came back.


First time I replaced o-ring (orange color), the noise went away for a few weeks, then noise came back. Then i replaced power steering pump with a re-built one and o-ring. The noise went away again. Then came back. 5 months later, i put in the original pump back with new o-ring, noise went away for 2 weeks. then came back again. Now i believe both original pump and rebuilt pump are fine. Leak happened somewhere else. I am baffled why for 2 weeks right after change o-ring, there was no noise.

Submitted: 1 year ago.
Category: Acura
Expert:  HONDASERVICE7791 replied 1 year ago.
are you losing fluid? does the level go down slowly?
Customer: replied 1 year ago.

no. i don't fill the fluid to "FULL" line. If i do that, i will lose fluid because of foaming.

Expert:  HONDASERVICE7791 replied 1 year ago.
ok it sounds like you are getting air bleeding into the system somewhere. check the power feed hose on the top of the pump for any signs of leakage and replace the o-ring on that line as well. any small air leakage into the system will cause noise and foaming
Customer: replied 1 year ago.

i know the foaming is caused by air leaking into the system. However i don't understand why leakage was not present right after i changed o-ring (2 weeks), then it re-appeared. Could the o-ring be damaged so quickly?

Expert:  HONDASERVICE7791 replied 1 year ago.
the air leakage could be very slow, i seen rare instances where the hose itself is porous enough to allow air to enter.As long as you are being careful when you replace the o-ring, adding power steering fluid to the o-ring to lube it before installation, and a new o-ring, then there should not be an issue with it
Customer: replied 1 year ago.

what's the part number for the hose and o-ring?

Expert:  HONDASERVICE7791 replied 1 year ago.
i"ll get you the part numbers
Customer: replied 1 year ago.

forgot to mention mine is 2003 MDX

Expert:  HONDASERVICE7791 replied 1 year ago.

i got the info from your first post. here are the part numbers:

 

hose 5640-p0h-h013

o-ring 91345-rda-a01

Customer: replied 1 year ago.

i am able to find the o-ring on http://www.hondapartsunlimited.com/parts-catalog/acura/mdx/2003/5dr-prem/ka5at/chassis/ps-lines, but not hose. Are you sure the first part only has 4 digits?

Expert:  HONDASERVICE7791 replied 1 year ago.
sorry its 56490

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