It's an outboard, not a I/O!
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On 6 Jul 2005 08:03:30 -0700, "mjb920" wrote:
I have a '97 Pro-Line with a 150 HP Merc that has recently experienced
overheating problems. It idles at about 150F, and gets up to over 180F
at higher speeds before I idle back down. I am guessing it has both a
water pressure and a water temperature alarm, because sometimes the
alarm goes off right away when the motor is started cold, sometimes not
until the temp gets over 180F.
I replaced the impeller, which made no difference. The pee stream seems
hot and not as strong as usual. Is there anything else I can check?
Thanks,
Jim
My guess is a stuck check valve in there somewhere. It may just be
gummed up with 35 year old oil. I would start with a complete oil
change and do it a couple times, Oil is cheap.
Change it, operate the system for a while and change it.
Maybe a little dose of automatic transmission "revuvenator" and use
ATF on the first pass.
BTW "hydraulic fluid" is just light machine oil. I would avoid
multiviscosity motor oil. I would use ATF or power steering fluid. It
is more appropriate to the application than motor oil.
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