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    Rebuilt Mercruiser 5.0 won't start, ideas please?

    Ok, Just got my boat back in January after a lost season last year where we were waiting for a rebuilt Mercruiser 5.0 engine for my 2006 Chaparral. I had a Boat repair company put in the new engine and winterize it and I took it home in January. The guy sent me a video of the engine running...
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Also Mike, Do you know where the Alarm circuitry is located? Is it under the driverside dash area? -BR Chris
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Not sure if it is a TB-V. Can you tell from the attached picture? I have the timing set at 12 degrees advance using the procedure in the service manual where you ground the purple and white wire to engine ground. I set to ten originally but it seems to run better at 12.
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Hi Mike, The gauge reads 170 once the thermostat opens. I replaced the gauge sensor with a new one just to be sure and it reads the same. I have a 160 degree thermostat which I also replaced during troubleshooting. I also replaced the springs and check balls in the thermostat housing as well...
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Update on the alarm situation. It is definitely the sensor on the right side of the thermostat housing (the two wire sensor). This sensor controls the audible alarm. The sensor on the left side is a one wire sensor and controls the gauge. When I disconnect the left side one wire sensor the...
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Thanks Bondo for your input. I did change the water separator filter when we replaced the heads, as well as the cap, rotor, wires, plugs, oil pressure switch and gear lube switch and reservoir. I set initial timing to 14 degrees trying to get more power, which is a bit more than the service...
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    Yes, once it is on plane the rpms go up. Not sure if it gets all the way up to 4800 though. It definitely wont get past 3000 until its on plane. Is that not normal?
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    2006 Chaparral 190SSi Mercruiser 5.0 has perplexing alarm/power loss

    I bought a 2006 Chaparral 190SSi w/5.0 Mercruiser carbureted last fall. It had a blown head gasket and cracked port side head. I replaced the bad head and head gaskets and put it all back together, changed the oil 5 times to get out all the water etc. We have had it out on the lake 3 times...
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    I looked up the ignition timing details in the service manual for the Mercruiser 5.0 Thunderbolt Carburated engine. It says that the Mean Best Timing spark advance will be disabled if an audible alarm is presnet. This seems exactly like what is happening in my boat (low power but no bad...
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    I did not check the fuel filter contents when I replaced it. Unfortunately its long gone now. Maybe a temporary inline fuel pressure gauge would be a good idea? I will change the oil and filter again and put the synthetic in this time at the proper level. Its only slightly overfull because I...
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    I talked to the machinist who magnafluxed the heads for me and he said that these chevy small block heads fail easily when hydrolocked and there is a good chance the lower end is not damaged if all the pistons are coming all the way up the bore and there is no visible cracks in the pistons etc...
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    Hello, Thanks for your input. We did replace the fuel filter after the rebuild. Is there a fuel pressure sensor for these carburated setups? Am I looking for water in the fuel? We did fill it up with fresh fuel but it still had half a tank of fuel in it when we filled it up. Also I...
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    Also we did have a single backfire on our 1 hour outing. Couldn't tell if it was through the carb or exhaust though.
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    2006 Chaparral with Carbureted 5.0 Mercruiser having alarm and limited power.

    I have a 2006 Chaparral with a 5.0 Mercruiser (carbureted). We rebuilt the top end of the engine last fall because the previous owner blew a head gasket and cracked the port side head when it hydro-locked. We replaced the port side head, gaskets and rebuilt the sterndrive replaced impeller and...
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    Mercruiser Alpha One Gen2 Sterndrive getting water in gear oil

    Hey guys, After rebuilding the top half of the engine in my Chapparal boat that I purchased in July, we were finally ready to take it out on the lake and test it this weekend. But after testing the new impeller we recently installed, we drained the gear oil after a 20 minute run using a big bin...
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    Oil Pressure and Water Temp Alarm Test

    We did the test this weekend. Using an alligator clip wire to a good engine ground we grounded the wire that attaches to the oil pressure sender. The audible alarm went off. We did the same test grounding the wire to the water temp sensor next to the thermostat. It has a tan wire. No alarm...
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    Oil Pressure and Water Temp Alarm Test

    Is there an easy way to test if the audible alarm is working on a Mercruiser 5.0 if the temp gets too high or the oil pressure too low. Previous owner of this boat blew a head gasket when he overheated the engine. Didnt get a chance to ask him if the alarm went off of not before he damaged the...
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    Puzzling Ground Wire on Mercruiser 5.0

    I recently did a head and head gasket replacement on a 5.0 Mercruiser that I purchased this summer. I took lots of photos of the engine before tear down just in case I couldnt figure out were some wires attached and whatnot. At the end of reassembly I had a ground wire with an eyelet connector...
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