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Re: 1988 Case 7120 - excessive blow by

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03-08-2013 10:59:42

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03-08-2013 11:11:26

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 Re: 1988 Case 7120 - excessive blow by in reply to 430WLPG, 03-08-2013 10:59:42  
Thanks for the reply. I have read that the early models(87,88,89) did have have a problem with the "ring lands" and compression rings. Would a compression test identify if the rings are at fault?

I have put cylinder kits in a Farmall M's before. Would this be a similar task, just much heavier?

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03-08-2013 12:30:14

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 Re: 1988 Case 7120 - excessive blow by in reply to pistons, 03-08-2013 11:11:26  
edit to my above comment. I should have clarified, broken ring lands, would be referring to the piston having a portion broke off. Where does that broken piece go? Either it gets hammered by a valve and pushed out if small enough, or it stays in there and bounces around. Either way, if a ring land is broken, there is cylinder scoring, which will require a new sleeve, and if the valve hit it, then the valves will need replaced in the head. I can only imagine that maybe there is a cylinder that has significant damage. But does a damaged cylinder affect the rest of the engine? Can a fella count on fixing that cylinder, because the rest of the engine is likely not broken, or otherwise damaged from it?

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03-08-2013 16:27:27

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 Re: 1988 Case 7120 - excessive blow by in reply to pistons, 03-08-2013 12:30:14  
I have a 89' 7130 on the farm and last year it developed excessive blowby. To make a long story short i found out after some investigation that the early model 7130's had a different injector that had problems and i had the injector tip blow up and torched a hole threw the piston. What i don't understand is why isn't the dealer that is selling the tractor fixing the problem as they get all there parts for wholesale and then he can advertise the tractor as a fresh rebuild and add to the value substantially.

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03-08-2013 16:29:06

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 Re: 1988 Case 7120 - excessive blow by in reply to njfarmer, 03-08-2013 16:27:27  
You didn't mention it but, How many hours are on the tractor?

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hours - 10,500

03-09-2013 12:38:33

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 Re: 1988 Case 7120 - excessive blow by in reply to njfarmer, 03-08-2013 16:29:06  
Well, it sounds like a fella would have to count on buying the cylinder kit, and maybe some injectors. 10,500 is alot of hours.

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03-09-2013 22:50:04

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 Re: 1988 Case 7120 - excessive blow by in reply to hours - 10,500, 03-09-2013 12:38:33  
Quoting Removed, click Modern View to see

My 8920 has 6K and some blowby and uses a little oil ~1 gallon in 2-3 days working hard. Head shop guy told me the engine is in great shape and just needs valves reset, did that. Sent injectors in for a rebuild (to a performance shop) got a little bit of a power boost on them, added fuel and a better set of wheels on the turbo. Next I bent the shaft on the 250 hp pto dyno and before I was pushing ~180-190hp.

These tractors can do some serious work when built right but are a solid work horse out of the box. I dont recommend adding alot of fuel with out a better flowing turbo for lower egt's. My egt's are actually slightly lower that before the valve job and 180-190hp dyno. I have mechanical gauges for EGT, boost, oil pres, coolant temp, oil temp, and fuel pressure (very informative, the bar gauges are junk imo)

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03-10-2013 11:47:23

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 Re: 1988 Case 7120 - excessive blow by in reply to tanman_2006, 03-09-2013 22:50:04  
What are egt's? And yeah, I have read that though advertised as 150 at the drawbar, people often say they put their 7120 on a dyno and see them commonly much above 150.

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03-10-2013 14:05:43

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 Re: 1988 Case 7120 - excessive blow by in reply to pistons, 03-10-2013 11:47:23  
I was getting 1400*f before and 1300*f now. Those are highest I've seen not common.

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