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Old 06-22-2015, 12:57 PM   #1
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Default 1999 2100SR Parts/overheating

I would like to go ahead and get parts/pricing info on manifolds, risers, thermostat, temp sender, etc., because my overheating alarm is going off (even though it only shows 175 when it happens). Where are you guys ordering mercruiser parts? I would also like to find a parts manual for my boat. Any ideas? I have the 5.0L, thats about all I know about the engine so far. Only had the boat about a month and I love it, but I would like to go ahead and get some stuff ordered to prevent any issues. Does anyone know at what temp the alarm should be going off? 175 seems pretty early (low) for an alarm. Makes me wonder if either I'm running hotter than the gauge is reading, or if my alarm sender is bad? Either way, I'd like to play it safe and order everything that I know I am eventually going to need anyway.
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Old 06-22-2015, 03:49 PM   #2
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You need a mercruiser parts list for the engine. I recommend that you try to download or buy a manual.

First thing I would do is use a hand held IR temp sensor to verify engine and exhaust temps.

175 is normal for an open cooling system.

BTY the alarm is tied to 3 warning sensors; temp, oil pressure, and lube monitor for the drive. Are you sure its a temp issue?
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Old 06-22-2015, 10:12 PM   #3
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Yes, I'm sure its a temp issue. The alarm goes off when I go over 175 every time. When I back off the throttle and bring the temp back under 175 it stops. It makes me wonder if my temp gauge is off and I'm actually getting hotter than it is reading. I may get an IR temp sensor at harbor freight or something if replacing the impeller doesn't resolve it.
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Old 06-22-2015, 10:14 PM   #4
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How do I get a parts manual for the boat itself? or does anyone even carry Maxum parts anymore? Any good resources for boat parts? I have a latch that I need to replace that I am trying to source through southco, but would love to see an illustrated parts breakdown of the entire boat for future reference.
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Old 06-23-2015, 02:54 AM   #5
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Not sure but try maxumcustomer care site for a manual.

However things like latches came from Perko or some other supplier. Maxum just built the hull, deck, ...

Greatlakeskipper bought up some of the surplus parts.
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Old 06-23-2015, 04:17 AM   #6
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Check my post back in 2013. I have issues with my 2004 2400 with the warning horn sounding for no apparent reason.

UPDATE:

Warning horn seems to activated by small roll back of the throttle not as I have posted about rough water. All oil levels/pressures/temperature are normal but a small correction in engine throttle seems to set it off.
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Old 06-25-2015, 03:39 PM   #7
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After another trip out on the water, and monitoring the guages more closely, it seems that the alarm goes off when I'm hitting 200 deg. So its definitely time for an impeller and if that doesn't fix it, I'll be doing manifolds and risers. Now to source the parts. Its an Alpha one Gen two 5.0L merc. It looks like these parts are pretty easy to find. Any suggestions on brand, or is OE pretty much the standard?
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Old 06-25-2015, 03:52 PM   #8
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For the impeller I prefer OEM. If you replace the exhaust aftermarket is ok just do not go with the lowest such as GLM.
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Old 06-25-2015, 03:54 PM   #9
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Sounds good buddy, thanks.
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Old 06-25-2015, 03:59 PM   #10
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You are welcome my friend.

Have you replaced an impeller before? With the Alpha its located in the lower unit. The gear lube must be drained, shifter in forward, remove zinc to access 1 hidden bolt, remove other nuts, pull off lower unit.
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