In reply to a message from Str8-6 sent Mon 17 Aug 2009:
If you are referring to the combined Power Hydraulics /
Power Steering HSMO reservoir on your '90, providing you no
longer have SLS (and, preferably, if you have also removed
the therefore redundant Power Hydraulics hardware and
plumbing) you can use either HSMO for the remaining Power
Steering or can drain it and switch to ATF.
In my case, after removing all the aforementioned junk, I
continue to use HSMO for the Power Steering because there is
nothing left which is susceptible to leakage as was that
‘plumber’s nightmare’ Power Hydraulic system. With only the
Power steering using the HSMO, you should never need to top
up that reservoir above the ‘Y’ mark on the dipstick.
The important thing is that the Power Steering pump, rack
and plumbing is perfectly happy with either fluid - in fact
all the part numbers are the same.
HSMO is the greeny/yellow stuff. ATF is pink.–
The original message included these comments:
I’ve seen a number of posts relating to the hydraulic system, but
how do I identify the HSMO against ATF? My fluid is a bright yellow
oil, so I am guessing it’s HSMO (1990 XJ40)?
I understand that I can drain a couple of times and refil with ATF,
but if I can get hold of HSMO am I better sticking with it? At the
moment I don’t think I have SLS but I’ll check soon.
The reservoir oil level is a little low so I want to top-up, but I
think I’d rather stay with HSMO if I can rather than change - after
all, if it ain’t bust don’t try to fix it?
Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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