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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oliver 1800B Engine Knock

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Brian in IL

11-20-2003 07:34:16




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I have an 1963 Oliver 1800B which has a knock in the back end of the motor. As I increase the RPM'S it seams to make a higher pitch sound. Am I looking at a complete overhaul here? If I'm needing this rebuild, what complications might I be looking at since I'm not a mechanic? I've replaced engines in cars before but never rebuilt one. The tractor runs and drives fine except for the knock. Thanks, Brian

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Doug

11-28-2003 21:29:39




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 Re: Oliver 1800B Engine Knock in reply to Brian in IL, 11-20-2003 07:34:16  
I am about 90% sure you have a spun rod bearing in #6. I have heard your description many times, and have seen this many times.



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J. Schwiebert

11-20-2003 15:08:00




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 Re: Oliver 1800B Engine Knock in reply to Brian in IL, 11-20-2003 07:34:16  
Gas or Diesel? Can you short out a cylinder and make the noise go away?



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Brian in IL

11-20-2003 16:37:41




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 Re: Re: Oliver 1800B Engine Knock in reply to J. Schwiebert, 11-20-2003 15:08:00  
It's a gas engine. What do you mean by short out the cylinder? Thanks, Brian



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J. Schwiebert

11-20-2003 16:45:15




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 Re: Re: Re: Oliver 1800B Engine Knock in reply to Brian in IL, 11-20-2003 16:37:41  
Take a screwdriver and while the engine is running, place the screwdriver shank on the plug wire and ground the other end. When the spark follows the screwdriver,the engine will naturally miss. It will also take the "load off of that cylinder" A good way to find out which cylinder(s) are causing you the trouble. 1800 B gas is good old reliable engine in my opinon.



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Brian in IL

11-20-2003 19:56:38




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 Re: Re: Re: Re: Oliver 1800B Engine Knock in reply to J. Schwiebert, 11-20-2003 16:45:15  
Is it concievable then if I find one cylinder to be causing the knock that I could replace the bad bearing or part only? It would be nice not to do the full overhaul if possible or practable. Thanks for the help here, Brian.



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Brad

11-20-2003 22:19:48




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 Re: Re: Re: Re: Re: Oliver 1800B Engine Knock in reply to Brian in IL, 11-20-2003 19:56:38  
real good chance it's a wristpin bushing. if so, have a good machine shop magmiflux all the rods and install the one piece bushings. if the old bearings aren't totally junk, put them back in exactly where they came out. these engines usually, but not always have a habit of chewing up new bearings if the crank is not ground.



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Shep VA

11-21-2003 05:35:23




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 Re: Re: Re: Re: Re: Re: Oliver 1800B Engine Knock in reply to Brad, 11-20-2003 22:19:48  
That is what I was going to say... Saw an 1800C that was doing the same think, that knocking coming out of the back of the engine. Turned out the two piece wrist pin bushing was gone and the hole in the piston was longated and ready to break. Guy got lucky on that one, he almost had an extra vent hole in the crankcase.

If this is the problem you can do an in frame overhaul and not have to pull the engine out if the Crank is still good.

Good Luck

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