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Old 04-13-2011, 01:24 PM
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Default Merc 225 EFI with temperature anomaly- ideas?

I have a 2002 Merc 225 EFI. I bought it a year ago with under 300 hours. It has around 450 now. The pee stream is very weak, none at idle, a trickle at 4500 rpm. The dash gage says it runs around 200 degrees but the trickle is warm, not hot.

The previous owner gave me the service records and he chased this problem for 4 years, water pumps, sensors, etc. He finally gave up.

I bought a Smartcraft gage. It says the temp rarely goes over 125, and usually runs under 120. The gage also reports 3 psi water pressure at idle and 13 psi water pressure at 4500 rpm which is all in spec but there is still that dribble at the pee hole.

This all seems odd to me. Any ideas? It isn't clogged.
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Old 04-13-2011, 01:32 PM
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Have you check for and obstruction somewhere inside the water jacket? I also have a 2002 225 EFI Merc on my boat and after replacing the impeller last year, the pee stream is huge. Bigger than on any other outboard I've seen.

I use to have a duck boat with a 90 merc on it that I would run in the Glades and one time I had it suck some mud up and overheat. It was so bad that I had to remove the gear case and clear it out and it never peed the same after that. Until one day I took off the head and there was a ton of crap built up in there blocking the water passage near the pee hole.
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Old 04-13-2011, 01:36 PM
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You may have something in the hose maybe, you never mentioned pulling the pee hose off inside the cowl and check the flow. Those PSI numbers are fine for a Merc - temp actually is a bit low, should about 140 at idle
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Old 04-13-2011, 01:50 PM
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I can run a nice green pine needle up in it 4 or 5 inches with no obstruction. It's been idling for 10 minutes on the hose, water going in is 77 degrees, SC Gage reads 113 degrees.
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Old 04-13-2011, 01:53 PM
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Default Sensor location?

The dash gage sensor is on the port side between the top and middle piston cylinder. Where is the SC Gage getting the data?
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Old 04-13-2011, 02:15 PM
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Sounds like you have enough water flowing, your issue is the pee stream? keep going - pull it at the block. You apparently have pull a thermostat housing off and have plenty of flow there correct - your PSI is fine. Something is not letting 13 psi into that pee line
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Old 04-13-2011, 04:37 PM
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Those PSI numbers are fine. The temp is low. There was a thermostat update kit made for these motors to fix that.
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Old 04-13-2011, 06:39 PM
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Replace your Poppit valve also.
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Old 04-14-2011, 03:34 AM
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Quote:
Originally Posted by timebandit View Post
Those PSI numbers are fine. The temp is low. There was a thermostat update kit made for these motors to fix that.
Can you provide a part number for the kit, and for the poppit valve? Is there one or two?
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Old 04-14-2011, 06:34 AM
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PM sent
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Old 04-14-2011, 01:16 PM
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There is only one poppit valve. Whats your serial number?
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Old 04-14-2011, 02:17 PM
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I also remember that upgrade, some guys were having plug fouling issues
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Old 04-14-2011, 04:04 PM
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I just changed the plugs and what I took out looked very good. I could have left them in.

The serial # is OT587235
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