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77 misses at high speed

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Josh

03-25-2002 06:52:44




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I have an oliver 77 and it runs nice at idle speed. When it is running at high speed it misses pretty bad. There is plenty of fuel coming into the carburetor and I cleaned the carb out and found no dirt at all. I didn't do a real good job cleaning it though, just blew some air through it. It has new plugs and the points look decent. Also the rocker arms make a good bit of noise. should adjusting the clearance quiet it down a bit? Thanks a lot.

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Dale

03-26-2002 06:01:47




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  
I read all the other comments and they are good. The other thing you might consider is, and you eluded to it when you mentioned the valves were noisy, that there may be a broken or weak valve spring.(valve float) Along with that maybe you have sufficient ware in the valve train to cause a problem, binding in some area. Make sure you have oil being supplied to the rocker arms. This is a problem with the Olivers when they have some age and havn't been serviced properly. Maybe it would be a good thing to pull that head and do a professional valve job, checking the guides, rocker arm bushings and shaft for wear and dressing the rocker arm ends where it contacts the valve.

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Galen Ishman

03-26-2002 05:32:38




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  
Some of the above suggestions were good....
First I would pull and examine all the plugs to see if there is one particular plug that looks wet or fouled.I would then replace it and run the engine again. If this plug comes out fouled again then you have isolated the problem to that cylinder. I would then do a compression test and compare that cylinder to the others. You may want to consider the fact that you possibly have a valve hanging up at higher RPM causing the sympton..(this may not show up during a low speed compression test)
Also check the play in the distributor shaft if you cannot isolate it to one particular cylinder. Another trick is to run the tractor in the darkness while moving the plug wire with an insulated screwdriver to see if you can detect a voltage arc jumping to ground from a defective plug wire.

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Shadetree

03-26-2002 03:26:47




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  
Good Morning A thought just came to me about your problem. Look at the distrubutor and find number 1 cylinder on the cap, looking down from the top the firing order should be 1,5,3,6,2,4 in a clockwise rotation. I have seen where by mistake someone has switched two wires and you may not hear it very well at low speeds but at high speed you can hear the miss very well. This may or may not be the problem but it would be the simplest one to address first. I hope this helps Good Luck Shadetree.

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Thats a Oliver for you! Miss Miss Miss

03-25-2002 17:52:47




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  



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Bob

03-25-2002 18:46:25




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 Re: Re: 77 misses at high speed in reply to Thats a Oliver for you! Miss Miss Miss, 03-25-2002 17:52:47  
I would much rather have an oliver miss miss miss than a putt putt putt, at least i KNOW that the tractor needs a tune up and besides i would rather push an oliver than drive what your would probably endorse



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We really don't need this crap here

03-25-2002 18:36:22




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 Re: Re: 77 misses at high speed in reply to Thats a Oliver for you! Miss Miss Miss, 03-25-2002 17:52:47  



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WEK

03-25-2002 18:36:02




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 Re: Re: 77 misses at high speed in reply to Thats a Oliver for you! Miss Miss Miss, 03-25-2002 17:52:47  
You're as pathetic in your English grammar as you are in your choice of tractors. Besides, why don't you sign your post like a real man?!



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TimC

03-25-2002 11:25:44




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  
Replace the points, or clean them with a burnishing tool. If cleaning them works replace them with a new set. Are the bushings worn in the top of the Dist? Spray the dist out with wd40 then whip dry. If that fixes it replace the dist cap and rotor button. Hopefully your plugs are not gapped so far that it promotes spark jumping across electrodes or wires.



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Shadetree

03-25-2002 09:01:02




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 Re: 77 misses at high speed in reply to Josh, 03-25-2002 06:52:44  
Josh have you looked below the plate that holds the points in place? Under that plate are the spring loaded fly weights that operate the advance for the distributor, make sure that they move ok and that they both have the springs attached. Next you might take a feeler gauge and check around the exhaust manifold, and especially the intake manifold for possible leaks around the intake where it contacts the head. Some times if you get enough warpage in the exhaust manifold it can pull the intake manifold slightly away from the head in the center where the two manifolds are bolted together. A slight intake leak can cause you the same problems. I know you said that you have plenty of gas going to the carbarator, the only thing I would suggest to double check is to take the sediment bowl off open the shut off cock fully and see if you have two steady streams of gas flowing about three inches apart. If not you will need to take the sedement bowl base unit out and blow it out clean. Next yes you should take the time to adjust the valves if they are loose it will cause performance problems too. If you have never adjusted valves get a book to help, it can be a very valuable tool to have around. I hope this helps Good Luck Shadetree.

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