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  1. S

    hydro lock

    I have a 5.7 mercruiser that is having a hydro lock issue. Last week after a successful day of boating we were sitting in a cove swimming. A few big waves came at us and hit the boat from behind. I have through hull exhaust so there is a possibility some water could have passed through. A...
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    starter not engaging

    I replaced my starter in a 5.7 mercruiser this year. I had the mechanic put in a high tourque starter this time. It has been performing fine for the past few weeks. Yesterday it started and stopped several times while we where kneeboarding. When then took a nice long boat ride thens stopped for...
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    no power with weight in the boat

    I am having some performance issues with my 5.7 mercruiser. It is a 25 ft regal with a bravo III. WHen there are four or five people in the boat, it seems to run fine with plenty of power. Yesterday I went out with 10. Max capacity is 12. The boat had no power at all from the start and wouldn't...
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    blowing fuse at start

    The other day the boat wouldn't start. I finally traced it down to the 15 amp fuse in the ecm box on top of the motor (5.7 mercruiser). There are three fuses in the lid of the box that have two 15 and one 10 amp fuse. This fuse seems to power the fuel pump and the audible alarms. I replaced the...
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    setting time on a 5.7

    I have a mid 90's 5.7 mercruiser with a TBI. I set the time in the driveway with timing light to 8 degrees advance. Seemed to run fine. Put it in the water and no power. Raised the cover and adjusted the distributer while under load and the speed picked up. I just left it alone for the day. Next...
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    carb vs tbi

    I replaced a bad 5.0 L Mercruiser with a 5.7 L with a little more power. Since the original engine was a vortec with the TBI, I decided to build a vortec motor to keep from replacing everything. The engine shop put an upgraded cam and some other little items to give me a little more HP. I...
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    starting and power issues

    I have a 5.7 mercruiser that was recently rebuilt with some upgraded performance. It is a vortec motor with the TBI. It has been running good all summer but today it would not start. When my daughter tried to start, it gave a short grunt and then just turns over. I noticed that when I turn on...
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