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 17.5 tecumseh making a weird noise

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Clapped Out Ben
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PostSubject: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeApril 30th 2021, 12:00 am

I have had this Murray for about two years and I have completely built it up into a 40 mph all terrain mower. Ever since I bought it, it has made this weird noise, almost like a rattling or I don’t even know. I straight piped it a year ago and it is un governed. It is still making the noise, i can’t really tell what it is I know it is common for tecumseh motors to be loud. It does not have any loss of power, it runs perfect and there is no metal shavings in the oil, and it only burns oil every once and a while if it sits on a hill facing down hill on startup. I am running a wix filter with Lucas 10w30 oil that is advertised “for wet clutches” I do not know if that has anything to do with it. I have not changed the oil since last year so it is due for a change. It gets very hot where I live too. I do not know if these are all factors. It has a dirt bike carburetor on it. Brand new spark plug. Could it be the valve lash is off? Or is it more likely excessive wear in the crank bearings


Last edited by Clapped Out Ben on May 3rd 2021, 10:45 pm; edited 1 time in total
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Rustbucket Garage
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeApril 30th 2021, 7:54 am

Might not be internal either...maybe something isn’t bolted down right?
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Clapped Out Ben
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeApril 30th 2021, 2:39 pm

I will make sure the mounting bolts are tightened all the way. If it keeps going after that should I run thicker oil?
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeApril 30th 2021, 5:20 pm

I was thinking loose governor parts or gears rattling around. Don't run thicker oil. Use the oil specified for the engine.
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Clapped Out Ben
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeApril 30th 2021, 10:49 pm

Tightened all the bolts down, still no luck. Will it kill the engine to keep running like this or can I still use it how I always have? Thanks!
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeMay 1st 2021, 10:02 am

I’m gonna try changing the oil and filter and see how that works and maybe I’ll put some zinc additive in it. If that doesn’t help I’ll pull it
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeMay 1st 2021, 10:45 am

I have another motor I saved as a possibility to put in this Murray, it is a 14.5 I/C Quiet Briggs. I have not put it in yet though because I was thinking of that motor as a downgrade from this one because it is not pressure lube. Does it make that big of a difference if the motor is pressure lube or not?
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitimeMay 1st 2021, 3:38 pm

Not really. It won’t last as long in the long term before needing a rebuild, but as long as you change your oil that is really far off in the distance.
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PostSubject: Re: 17.5 tecumseh making a weird noise   17.5 tecumseh making a weird noise Icon_minitime

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