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fastfarmall

Well-known Member
My brother's 756 went down,at first the local mechanic thought it was just the injectors, so they took them out sent them to the shop, put them back in, drove it too the field,say's it still miss's, now he thinks it's a hole in the top of the piston,is that possible, it all started when he put a bottle of sea foam in it !!!!!He just use's it on the haybine.
 
If there is a hole in the top of the piston, there should be considerable blow-by coming from the vent tube. Is there?
 
A good point, he didn't say and i didn't ask him, apparently not, because they drove it out of the shop, didn't hear it missing till he put it to work!
 
(quoted from post at 17:01:50 07/03/18) My brother's 756 went down,at first the local mechanic thought it was just the injectors, so they took them out sent them to the shop, put them back in, drove it too the field,say's it still miss's, now he thinks it's a hole in the top of the piston,is that possible, it all started when he put a bottle of sea foam in it !!!!!He just use's it on the haybine.
Click to expand...

You need a better mechanic, compression test is needed, one of mine broke a rocker and sounded like you are describing, low compression in one hole, pop the cover and there it was.

One rocker arm and back in business.

So what I am saying is you need to properly troubleshoot it not throw parts at it.
 
Get a different mechanic! Pull the valve cover,look over the valve train;run a compression check; or pull the injectors and LOOK inside with a borescope.
 
Well , since i am not checking the tractor out up close and personal we'll agree with others on what to check. If you had a hole in a piston you would have real blow by coming out the breather , If it was and injector it would be a dead miss under load and a flutter no load . Valve train problem could range from a flutter top dead miss load , no load. Valve cover gskts are cheap and also when was the last time the overhead has been done . The old finger test on injection lines tells a tale of injector problems . Broken rings on one or more pistons will give a miss on the higher compression engines due to lower compression on one or more holes. Might be and easy cheap fix or it may dig into the piggy bank .
 
The mechanic shot it with his thermal gun,said there was no heat on No.1 cylinder, and the Injection shop, said one injector was bad. My brother seldom does maintence unless it break's down, but he is good with oil changes, so i am sure no overhead was run. But it run as sweet as can be, last fall on the plow, at the plowing bee! He swear's up and down his problems all stared with 1 can of sea foam.
 
Much as I laud the benefits of seafoam, one pint of the stuff into 34 gallons of diesel fuel or even 16 quarts of oil isn't going to cause problems. It's just a coincidence.

Seafoam only really works in concentrated form. Dumped in a tank of fuel, it's so diluted that it really can't do anything, and it's a total waste of money dumping it into the engine oil. May as well take a leak into the dipstick tube for all the good it does.

Tractors ALL run "sweet/great/fine," until they don't. You don't get a warning. There is no expiration date. It just happens one day, for no apparent reason. That is the nature of 50+ year old beasts.
 
Mast people try additives first as a possible easy way to fix a problem. What was the reason he added the Seafoam?
 
He said he bought two cans of it, put one in the pick-up and it ran better, so he put the other can in the tractor,cause he doesn't use it much,the tractor does have have 8,500 hours,he's owned it about 15 years!
 
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