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100 hour service creates problems

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piron

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Yamaha F 250 btxr 600 hours ,,, new spark plugs , cooling impeller, oil and gas filter ,and zinc anode above propeller .Also clean and detail .. My engine ran smooth . Now after that work ,when I drive at idle speed 800 rpm the boat viberates .I feel vibrations in steering wheel,floor, and t-top. The shaking is most noticeable between 3400 rpm to 4000 rpm .Except for the shaking the engine run good . The stupid mechanic says its normal. Please help
 
Are the wires going to the correct plugs? Do a cylinder drop test just pull a plug wire and put it back on while the engine is idleing the engine should respond the same on each wire. A good pair of insulated channellocks will keep you from getting bit. That will tell you what cylinder/s are not firing.
 
That engine has the coils that fit directly onto the spark plugs you probably just have a couple connectors on the wrong coils or a bad connection somewhere. Sounds like you need a new mechanic other than preventive maintenance you likely will need a scanner to determine the next course of action.
 
the f 250 has a 1 inch by 3 inch rubber sleeve that that slides over each spark plug....I will try your drop test. How could I have a couple connection on the wrong coils ? the mechanic accidently switched something? I do not think he had any reason to take wires off. I had M.E.D.S. printed ot for me. (sytem info, faults,history, etc. ) Is a meds report the same thing a scan test ? kimcrwb1 You are definitely right about 2 things .I need a new mechanic and if it aint broke don't fix it.thanks
 
I assume the service included greasing the prop shaft. Is it running out now? Do you feel the vibration when in neutral/idle. Raise the RPMs to 800? If so, check the prop for damage and the shaft for run out. who knows how how he removed the prop.
 
Mechanic said he greased everthing,so I presume he did.

I don't under stand your question .. Is GREASE running out now? not really..

I think it viberates a little in neutral .

When you say check the shaft for runout does mean check it for a bend ?
 
A part of the service is to remove the prop, inspect it for cracks, see if the main bearing housing is sound and without foreign material. Before he puts the prop back on he will coat the shaft with a material (grease confused you) that will prevent the prop hub from seizing on the shaft. If he found your hub seized when he started, he may have been aggressive.
Runout is a term I used describing a bent shaft. If it is bent then you have a bigger problem.

I hope you find your problem.
 
The vibration could be a bent prop it is allways a good idea to put a identifying mark on the prop only you know about before you turn it into a shop. Some of those guys can be real crooked especially your marina mechanics. It just sounds like something shady going on there. If it was running good it should still be running good 100 hrs the engine is still a baby.
 
Everything is pointing towards bad or wrong connections on coils or plugs,ohm out each one. You mentioned new plugs installed,were they gapped precisely ,wires replaced with an audible snap on plugs, Recheck firing order again. Check area around plug wires,other connectors disturbed, When cowl was taken off and replaced anything askew. piron,you mentioned fuel filter was changed, Is it possible some crud got past filter into carbs? Was fuel/water separator dumped,contents inspected ,refilled, and reinstalled. Thread says 600 hrs title on post says 100hrs for all following
 
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johnnygjr ...I will ohm out each coil ... mechanic said plugs were factory set . he is wrong ...........mechanic installed new after market fuel/water separator.

my year 2008 motor has 612 hours ...The shop said I am paying for " 100 hour service'' thanks for helping me
 
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