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Case Tractors Discussion Forum
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Case 680 Cylinder Head Problem

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KevinT

03-30-2008 18:06:28




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I have a 68 Case 680B with a A267B Diesel engine that has been starting poorly requireing either to start. Also had exhasut in radiator so thought I had a bad head gasket or cracked sleeve. Pulled the heads this weekend and found a problem. The #3 piston and cylinder head looks like someone was target practicing with a 12 gauge. It gives a new name to swiss cheese. Pitted beyond repair. All the other pistons and cylinder heads look good, but sicne the head are in pairs one set will have to go. What would cause this type of damage? I have pictures but not sure how to attach them some the forum can view. Thanks for the help

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mEl

03-30-2008 19:20:14




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 Re: Case 680 Cylinder Head Problem in reply to KevinT, 03-30-2008 18:06:28  
Did you find the water leak , the pitting is probably a result of water. There are many engines running well with that type of pitting on the surface of the head, if the head is not cracked and passes a magnaflux test and a pressure check, plane it till it is smooth without trying to get the pits out. Check the sleeves carefully on the flange where the gasket sits for cracks and also for sleeve recession, the sleeves should stand out of the block a min. of .002" at the flange/ block area. Heads of course can be replaced singularly should you find a reason not to re use for reasons other than the pitting.mEl

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KevinT

03-31-2008 09:11:15




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 Re: Case 680 Cylinder Head Problem in reply to mEl, 03-30-2008 19:20:14  
Thanks for the input. I know I have a water leak somewhere due to the exhaust in the radiator and by the signs of the damage it must be this cylinder. The ridge at the top of the sleeve is gone on one side and the area looks very pitted like the head. Does it make sense to think that this was the point of the leak?? This sleeve and piston will be replaced but the head can be reused if it test out. Is this what you would expect to see if you had a bad head gasket that when unchecked fro some time? Thanks

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mEl

03-31-2008 14:41:38




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 Re: Case 680 Cylinder Head Problem in reply to KevinT, 03-31-2008 09:11:15  
If the sleeve edge is at block level there is probably a problem with the sleeve counterbore. The block should be checked for cracks in the counterbore area, resurfaced and the sleeve protrusion reset. There are shims available from Case to raise the sleeves but they assume a block in good condition. If the head passes a magnaflux and a pressure test, the head can be planed to restore flatness, the pits will not be an issue, they just look kinda ugly!

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KevinT

03-31-2008 21:01:56




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 Re: Case 680 Cylinder Head Problem in reply to mEl, 03-31-2008 14:41:38  
mE1

Thanks for the advice. Looked at the # 3 sleeve and it has 2 crackes in it at about 10 oclock. Looked at the head again and I think you are correct so I am dropping off both heads to be magnafluxed / pressure tested tomorrow. I am going to sell this machine onces running so should I replace the piston along with the sleeve? Probably inexpensive at that point. I am also going to mic the other bores later this week but am thinking about running a ball hone and new rings on all cyclinders if they check out. Sound reasonable? Thanks for all the help.

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mEl

04-01-2008 03:46:15




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 Re: Case 680 Cylinder Head Problem in reply to KevinT, 03-31-2008 21:01:56  
If the piston mikes out ok and the ring grooves are not worn, if you are going to sell it just replace the sleeve ,check the sleeve standout and if its ok rering it and put it back together. I have a 830 (301) diesel that I used the pistons over, the top ring groove was loose so I chucked the pistons in the lathe and widened the top ring groove to 1/8" rings , got individual top compression rings and its been running great for ten years. Borrow a depth mike and check the counterbore for damage from erosion or cracks. If its ok put it back together. mEl PS when reinstalling the heads before touqueing after cleaning the surfaces, put the intake and exhaust manifolds on and then torque the heads, that allows the heads to align themselves before you torque them down. Good luck.

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KevinT

04-08-2008 09:51:45




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 Re: Case 680 Cylinder Head Problem in reply to mEl, 04-01-2008 03:46:15  
mE1

Well just wanted to let you know that your were correct. Brought the heads to an old timer and he magnafluxed and pressure tested them and they were both fine. He replaced the valves on teh number 3 cyclinder, recut all the seats and planned the heads for $235. This seems more than reasonable. Thanks frot eh advice and costs savings!!!!

With that said I now need to fix the real problem, cracked sleeve. Any recommnedations for aftermarkets parts for individual sleeves and associated parts and pieces? I also mic"d the sleeves and they are all within spec so I am foinf to do a light ridge ream, ball hone and new rings. What did you mean when you said, check counter bore? Thanks for the help.

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