Author	[Modern View]
430WLPG 03-08-2013 10:59:42 64.250.200.62 Report to Moderator	BROKEN RINGS VERY COMMON ON EARLY PISTONS [Reply]   [No Email]
pistons 03-08-2013 11:11:26 67.52.234.226 Report to Moderator	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? [Reply]  [No Email]
pistons 03-08-2013 12:30:14 67.52.234.226 Report to Moderator	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? [Reply]  [No Email]
njfarmer 03-08-2013 16:27:27 68.36.72.141 Report to Moderator	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. [Reply]  [No Email]
njfarmer 03-08-2013 16:29:06 68.36.72.141 Report to Moderator	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? [Reply]  [No Email]
hours - 10,500 03-09-2013 12:38:33 75.92.244.100 Report to Moderator	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. [Reply]  [No Email]
tanman_2006 03-09-2013 22:50:04 198.46.29.143 Report to Moderator	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) [Reply]  [No Email]
pistons 03-10-2013 11:47:23 75.92.244.100 Report to Moderator	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. [Reply]  [No Email]
tanman_2006 03-10-2013 14:05:43 198.58.53.185 Report to Moderator	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. [Reply]  [No Email]