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Old 11-25-2022, 05:47 PM   #1
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Default Spark Plug Removal

I have a 5.0 throttle body fuel injection. I think the engine might be hydro locked. Is it had to remove the plugs since they cannot been seen since they are hidden under the manifold. and after removal should i take a compression test of the cylinders. any information will be helpful thanks. what is the procedure i should follow. thanks
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Old 11-25-2022, 08:51 PM   #2
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If water comes out when the spark plugs are removed the engine needs to be pickled. Change engine oil, oil in the cylinders and crank without plugs installed. Then install plugs and get it running to burn off any water. Why do you suspect itís hydrolocked? The source of water intrusion needs to be corrected ASAP.
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Old 11-26-2022, 04:22 PM   #3
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Thanks Admiral. The last time I took the boat out, I went to start the engine and it made a weird sound. The second time it started right up. I went to my fishing area and shut the boat off for about 30 min. Went to start up again and the same thing happened. I decided to head back to the staging area where the remove the boat and have the mechanic look at it. He removed the plugs and bump the engine and said some water came out of the cylinders. then replaced the plugs hooked up the muffler with water and started the engine. after running it he then shut it down and rechecked the cylinders' and again had water in 2 cylinders. He checked the compression and all were about 140 and one was 90 psi. They say it is then hydro locked? what are your thoughts. Thanks
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Old 11-26-2022, 04:23 PM   #4
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Happy thanksgiving
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Old 11-26-2022, 06:44 PM   #5
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If it was hydro locked the starter would not be able to turn the engine over. However having water in the cylinders is a sign of an issue. Being that itís just two cylinders with water is more concerning and worse yet is the cylinder with only 90 psi. What two cylinders are getting water in them? A leak down test on the low cylinder should be performed to see if itís a leaking valve vs rings that are the source of the low compression. What is the shop recommending?
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Old 11-26-2022, 06:45 PM   #6
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I hope you had a Happy Thanksgiving as well. BTY you can call me Mike.
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