Took the boat to the dealer and got them to drill out and replace the thermo sensor i broke off and told them that one engine is idling low. Went to go pick it up and they told me that the engine that is idling low is rattling real bad and the bearings are broken?? He said it would lot last long and i would have to replace the engine!!! Does this sound right because i would think if an engine is about to die there would be a little more signs than just idling low. Just let me know what you guys think and i am going to take it somewhere else next week to get a second opinion on this. thanks
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Bad News!!!!
- Thread starter masonf24
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If the bottom end bearings are bad it would rattle and indicate that it needs to be rebuilt or replaced. It's hard to diagnose over the computer with out hearing it.
Karl
Karl
That is what he thought but do you not think there would be more signs than just idling low?????????? And another question, my new engine is dropping rpms when at top speed. i get it to 7k rpm and it drops to 5k and then back up. It will continue to do this the entire time. It is fine though when i keep it at 6k rpm. thanks for all of your help and if i do have to purchase a new engine where do you recommend getting me one and what do you think is the expected ours for a mechanic to install it. You have a been a great help, and maybe one day i can have a good running boat. everything is brand new now except for that one motor which i guess will be replaced soon. He also told me to just run it till it dies!!! Is this good advice???
Problems.....
You can take a few steps yourself to check that engine. The tests aren't completly conclusive, but it's a start and it's better than nothing. Disconnect the battery before doing this.
Remove the grey plastic shaft cover at the rear of the engine to expose the shaft. Then, remove the plugs and lay them aside. Use your hand to spin the drive shaft, counter clockwise with your hand. You'll be listening for anything that "pings" or "pops" or feeling anything that isn't smooth in the spinning of the shaft. If your lower end bearings are going bad, you may be able to feel or hear something, depending on how bad they are.
You can also check your wrist pin and connecting rod bearings by putting an un sharpened pencil in the top of the spark plug hole. Watch the pencil as you rotate the shaft. With the piston at it upper most position, you'll see the pencil fall to the bottom of the stroke and for a split second, it'll stay but then, start to rise back to the top. You can also apply a little pressure with your hands on the pencil, so that when your piston reaches the bottom, if there is any wear in the bearings, you'll have enough pressure on the pencil that the connecting rods may pop. If this happens, then you may be close to engine replacement. I use SBT .......they have good prices and a "no fault" warranty program.
Your engine that runs erractic. If the engine your mechanic says is close to a needed rebuild is running sound, you can swap the carbs to the other engine, just to test if the issue your having is a carb problem.
One more little trick I have up my sleeve. If you have an engine stethescope (which most of us don't) you can listen to the bearing noise while the engine is running. My trick to this is to use a long screwdriver. Fold over that little cartlidge flap to cover the hole of your ear, put the screwdrivers handle firmly over that flap and ear, then, put the screwdrivers point on the engine, near the crankshaft area or as close to any of the rotating parts. You'll be amazed at what you can hear!.............:cheers:
You can take a few steps yourself to check that engine. The tests aren't completly conclusive, but it's a start and it's better than nothing. Disconnect the battery before doing this.
Remove the grey plastic shaft cover at the rear of the engine to expose the shaft. Then, remove the plugs and lay them aside. Use your hand to spin the drive shaft, counter clockwise with your hand. You'll be listening for anything that "pings" or "pops" or feeling anything that isn't smooth in the spinning of the shaft. If your lower end bearings are going bad, you may be able to feel or hear something, depending on how bad they are.
You can also check your wrist pin and connecting rod bearings by putting an un sharpened pencil in the top of the spark plug hole. Watch the pencil as you rotate the shaft. With the piston at it upper most position, you'll see the pencil fall to the bottom of the stroke and for a split second, it'll stay but then, start to rise back to the top. You can also apply a little pressure with your hands on the pencil, so that when your piston reaches the bottom, if there is any wear in the bearings, you'll have enough pressure on the pencil that the connecting rods may pop. If this happens, then you may be close to engine replacement. I use SBT .......they have good prices and a "no fault" warranty program.
Your engine that runs erractic. If the engine your mechanic says is close to a needed rebuild is running sound, you can swap the carbs to the other engine, just to test if the issue your having is a carb problem.
One more little trick I have up my sleeve. If you have an engine stethescope (which most of us don't) you can listen to the bearing noise while the engine is running. My trick to this is to use a long screwdriver. Fold over that little cartlidge flap to cover the hole of your ear, put the screwdrivers handle firmly over that flap and ear, then, put the screwdrivers point on the engine, near the crankshaft area or as close to any of the rotating parts. You'll be amazed at what you can hear!.............:cheers:
Gunsrunner
New Member
Good one with the screwdriver Louis, i have used that trick to listen to lots of different things like bearing noise and the like!!!!:rofl:
I also agree with you on the SBT engines, still haven't fitted mine yet.
It takes me about 4 hours to fit a motor, have done it 3 times now.
I am finding it easier to take the motor out than to work on it in the bilge these days!!!:ack:
I also agree with you on the SBT engines, still haven't fitted mine yet.
It takes me about 4 hours to fit a motor, have done it 3 times now.
I am finding it easier to take the motor out than to work on it in the bilge these days!!!:ack:
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