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John Deere Tractors Discussion Forum
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Jon won

07-09-2006 16:58:55




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I have a 49 G I just bored to .045 oversize. Pistons were fitted, rings installed correctly, has run 1hr. I still have excesive blow by smoke coming out the crankcase breather. The exhaust does not smoke, no oil burning, just crankcase blow by. Any suggestions? Also cooling system is clean, but temp runs on the HOT side. What could be causing this?




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Jak

07-11-2006 14:41:53




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
Hey Jon Won,did you pour straight antifreeze in it at first then top off with water?If so drain it back out and PRE MIX it then put it back in.I did this once and that thermosiphon system would not make the antifreeze mix with the water it just sat there in the bottom of the head and block(wouldn't circulate).It kept getting hot until I found out the hard way(trial and error).A friend of mine needed to seat his rings on his 49 G and did it on a two 16 John Deere breaking plow for a while.Works great now.Let us know.

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buickanddeere

07-10-2006 17:44:08




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
Could be excessive piston to bore clearance allowing the piston/rings to cock crooked in the bore. Rings seal best across the flat face instead across the edge.



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skip33652

07-10-2006 06:03:06




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
depending on the bore finish the rings will probably seat given time.most of these guys in the machine shops try to put too smooth of a finish on these tractor engines.if at all possible put it on a dyno with a varying load light load untill warm then full bore then light them medium etc.. if that is not an option find a plow or soething to work it .Paul



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johns48b

07-10-2006 04:53:30




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
i was just wondering if his vent pump for the crankcase is working. is there a way he can loosen the line going from the valve cover to the air inlet to the carb and see if he can feel it pumping air out? if its doing the same thing like it did before the overhaul then you didn't fix the problem. your valve cover gasket isn't leaking by chance is it? if it is i would suspect the vent pump not working. i'm only guessing that the a's have one like on my b.

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Will P

07-10-2006 14:55:28




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 Re: Question for all in reply to johns48b, 07-10-2006 04:53:30  
There is no vent pump.


Will P



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Steve Crum

07-09-2006 20:44:22




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
Dad had both Gs majored one winter. They were kind of cantancerous until spring plowing. Dad hooked the first one up on a 3 X 16 plow ran it up to 190 degrees and switched onto diesel fuel and ran it hard until the tank was empty. Took the first one back to the barn and repeated the process on the second one. Both ran like a champ after that. Dad said break em' like you run em'. They served for 44 years in the fleet.

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Don L C

07-09-2006 19:33:32




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
I guess you stagered the ring gap.....

I like to add a qt of oil to the first tank of gas and use her on lite loads like pulling hay wagons to the barn..... It will take a couple of hours work to seat the rings..... .Don



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Herny J

07-09-2006 18:52:58




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
Jon

You gotta find something to make that bad boy swet for a while. Or just let her be happy as is.



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B-maniac

07-09-2006 18:13:43




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
Like the other poster said,one hour without load just ain't gonna break er in. Also very important in the break-in procedure are heat cycles. You need to heat it up to operating temp--put a load on for 15 min--let it cool back to normal operating temp (10 min)--shut off and let cool completely (cool to touch)then do it again at least 10 times.It is my opinion that you cannot properly break in a TRACTOR engine with one long hot pull. You need heat cycles to let all the metal moving parts conform to each other,or as the ole' timers used to say "take a set". Race engines are a whole different breed. They want them loose and they don't care about blow by (that's why they have a catch-can plumbed to the valve covers to catch the blow by)Don't ask a race engine builder advise about your tractor engine. Most (not all) have tunnel vision.Good luck with your "G",they are a brute!

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Maark

07-09-2006 17:37:42




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 Re: Question for all in reply to Jon won, 07-09-2006 16:58:55  
The rings aren't seated yet. It needs to be worked or put on a dynamotor to get the rings seated.



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