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Thread: Overheating Issue
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06-01-2020, 05:49 AM #1Junior Member
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Overheating Issue
1993 175 hp Merc. OK at low speed and high speed, overheats, 170+, at medium speed (2500-3500rpm), then cools if speed is increased to high (over 4500+ rpm). Water pump and both thermostats have been replaced and water stream looks good. Any thoughts? Poppet valve?
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06-01-2020, 06:42 AM #2Screaming And Flying!
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Not a legit fix, butt....I cut 2 coils off the spring in the poppet on my 2.5 200. It had the same symptoms. Runs 145 now all the time. Instructor at merc school said it might fix some engines. You might also try a new spring? The problem occurs when the poppet is taking over for the stats. Poppet just opens easier with less water pressure needed.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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06-01-2020, 10:57 PM #3
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06-02-2020, 04:38 AM #4Screaming And Flying!
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Water press seemed to stay about the same. It runs about 20 psi at wot. 12 or so at 3500 cruise.
Last edited by XstreamVking; 06-02-2020 at 04:41 AM.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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06-02-2020, 04:57 AM #5
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06-02-2020, 05:51 AM #6Junior Member
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06-02-2020, 06:14 AM #7
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06-02-2020, 06:15 AM #8
no mater what tha rest "looks like" best ta replace it all.. tha stainless parts (cup in tha housing and tha ride plate) will look jus fine but still be wore.. same with all gaskets.... jmo.
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