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Ford 9N, 2N & 8N Discussion Forum
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Re: 2n with scary noise

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01-05-2013 08:30:50

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What is your history with the machine? Is it a sharp knock or more "deep" and internal? Some have mentioned exhaust/manifold leak. I would go with that if it is a sharp tick.

This won't be a popular answer, but my first thought internally was rod bearing. I had an IH engine that did that and it was eating rod bearings. It still had high oil pressure. Those letter series engine make about double the oil pressure an N is set at, so the oil pressure might be a better indicator on the N.

If it does it all the time that means something different than if it is only after an hour of running when the oil is thinned. In cold weather rod knock is usually a little better just because the oil doesn't get as thin when it is 10 degrees outside.

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01-05-2013 10:12:37

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 Re: 2n with scary noise in reply to Notjustair, 01-05-2013 08:30:50  
Notjustair...I've had the tractor for awhile but just got it up and running amonth or two ago.Alot of work done to it but no engine work. Never had it under load until the snow started falling and that"s when I noticed the knock. It does seem to be a faily sharp knock...I"ll double check for an exhaust leak..other than feeling of listening is there a better test for that? Dan

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01-05-2013 18:42:33

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 Re: 2n with scary noise in reply to BigDanT, 01-05-2013 10:12:37  
Rod bearings are a deep noise. Usually they don't make noise sitting and running, but when you throttle it up you will hear it and when you put a load on it you will hear it. It isn't a ticking sound but a real knock.

They usually knock pretty good on start up when there is no oil cushion. They aren't too bad when the engine is good and cold, but when that oil thins it will really knock every time you load the engine up.

It sounds like you haven't really heard it run much, so it could be rod bearings. Try and figure that out as quick as you can, cause if you run it with those bad rod bearings you will likely trash the crankshaft.

Then again, it could be an exhaust manifold leak. That would be easy and cheap!

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