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Order Farmall Cub Parts Online

$350 Cub Compression

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10-14-2000 18:21:01

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I cleaned off at least 10 years worth of crud today. Following that I took off the valve cover and every thing looks like it moves ok. Nothing seems to be stuck but the crud inside is thick as pitch. My guess is the oil must be a non detergent type. I can't imagine that much crud from a detergent oil.

Thinking all I had to do now was connect the electrical system and try to fire it up I thought I would turn the fan buy hand with the tractor in neutral and check the compression for myself. All 4 cylinder show 0 compression. Is this because the valve cover is off ? I can feel a little pressure from the exhaust pipe so it seems strange there would be no compression.

Any help would be appreciated.

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John Healey

10-15-2000 04:53:28

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 Re: $350 Cub Compression in reply to Stan, 10-14-2000 18:21:01  
Stan, put a couple squirts of motor oil in eash cylinder. If the rings and cylinder walls are dry you will have low compression. John

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Tractor man

10-14-2000 20:02:41

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 Re: $350 Cub Compression in reply to Stan, 10-14-2000 18:21:01  
cubs are rare and u have a good peice u might want to check to make sure that ur exhaust valve isn't stuck open it can look shut but they can be wide open

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Bill {Antique Acres}

10-15-2000 02:52:46

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 Re: Re: $350 Cub Compression in reply to Tractor man, 10-14-2000 20:02:41  
I am just curious as to where you are at Tractor Man? Not trying to start a argument, but are Cub's rare where you are at? The are a very common tractor. There was more Cub's produced over the years, than any other tractor model in history. Around 500,000 units produced. About the next closest model is the H, around 400,00. Bill {Antique Acres}

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10-15-2000 12:36:14

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 Re: Re: Re: $350 Cub Compression in reply to Bill {Antique Acres}, 10-15-2000 02:52:46  
Bill, maybe the "tractor man" confused "rare" with "desirable".
I agree with you that a cub is not a rare machine, but from the prices I see on them they are very desirable!

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ltf in nc

10-14-2000 19:06:55

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 Re: $350 Cub Compression in reply to Stan, 10-14-2000 18:21:01  
Stan, you will have to turn the engine by the starter to get a reading. Your method is too slow and the compression is bleeding off. Did you check to see if one of the valves has too much clearance or if one of the rockers is not moving as far as the rest of the rockers?

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Bill {Antique Acres}

10-14-2000 19:05:06

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 Re: $350 Cub Compression in reply to Stan, 10-14-2000 18:21:01  
You are going to either hand crank it or turn over with the starter. You can not turn it fast enough by the fan to check for compression. If you can turn it very fast with the fan then your belt is slipping badly or you are in bad need of a rebuild. Bill {Antique Acres}

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ltf in nc

10-14-2000 19:08:36

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 Re: Re: $350 Cub Compression in reply to Bill {Antique Acres}, 10-14-2000 19:05:06  
Bill, Looks as if we hit him with both barrels and at the same time!

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10-14-2000 19:28:50

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 Re: Re: Re: $350 Cub Compression in reply to ltf in nc, 10-14-2000 19:08:36  
Thanks Guys.

Tried my crank from the SA but as I am sure you know it was too big. I have not checked for excessive clearance yet. Every thing seems to be moving about the same amount. I was so happy just to see everything moving.

Read the article from Bill. After a check with the feller gauge I hope this will be my next step.

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