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Allis Chalmers Discussion Forum
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Allis B Head

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jeffalex2

05-31-2006 04:48:12




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Pulled the head off of the B yesterday and dropped off at the machine shop...just looking for any friendly advise to avoid fatal errors when I reassemble her. I have the service and shop books. Thanks




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jeffalex2

06-01-2006 19:02:46




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
Thanks for all of the input...the problem I was having seemed to be the result of a bad seat or weak spring. I'm gonna put her back together and she how she does. It's not a 'heavy use' tractor. She does a little mowing, and moves equipment around...including the little poop spreader.



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steve(ill)

06-01-2006 18:26:49




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
jeff, i did a real economy overhaul a few years ago. bought a CE motor in a box of parts. i honed the cylinders and installed new rings. i did pull the liners and put in new o-rings. i used the original bearings, just reshimmed to get .002 clearance on all them. i took the head and ground in the valves to get good seats. the guides were not too bad. reassembled and it runs fine. ---- like Butch said, it wont blow up if you dont do the bottom end, but i might burn a little oil. you can do it now, or reassemble and see how it goes for a year or two. you havent lost anything by putting the new head on and running for a while.

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Butch(OH)

06-01-2006 08:21:43




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
Heads are removed, reconditioned and installed on otherwise left alone motors every day. If you took the motor down with out acessing it for blow-by, oil pressure,knocks etc then your best guess is a good as anybody else"s as to if you should take it on down. That being said, personaly. I would invest $10 for a pan gasket and a few hours time to remove the pistons and rods check the condtion of the bearings and rings. If your flat broke put the head back on and run it, a new head isnt going to make it sieze up, throw a rod or anything else that it wasnt going to do anyway IMO.

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old

06-01-2006 19:32:44




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 Re: Allis B Head in reply to Butch(OH), 06-01-2006 08:21:43  
Yep 100s if not 1000s of them are done that way and thats why a lot of them end up in the scrap yards. Ya just doing the head will not make them throw a rod but it will blow the rings right out the bottom of the engine if used mcuh and then people just give up on them and trow them to the scrap guys. As I have always been told do it roght or don't do it at all. If it has head/vavle problems it also has ring problems

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jeffalex2

05-31-2006 18:42:10




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
Can I do just rings...or do I have to do sleaves and pistons also?..It's a matter of finance right now...I'm pushing $250-$300 just doing the head and new gasket right now. While I've got it apart, I'm also replacing all of the radiator hoses, thermostat spring (rotted), and I got the shutters working. The 2 bolts in the thermostat housing broke off, so I have to drill/re-tap those. And the funny thing is...aside from alittle sludge, this motor is pretty clean.

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Dick L

06-01-2006 06:03:40




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 18:42:10  
To make sure the sleeves are usable and you do not have a set of telescope gages you will need to get a new ring and place in the inside of the sleeve and measure the gap between the ends of the ring. You will need to do this from the top all the way down.



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old

05-31-2006 18:54:04




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 18:42:10  
As long as the sleeves aren't to bad off you can get by with new rings, main and rod bearings.



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old

05-31-2006 08:25:23




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
Save your self so time and money and put in new rings and rod bearing. Any time you pull a head off and have the valve redone your looking for trouble if you don't do the rings. What happens is the valve and ring wear and if you only fix half the problem you will find your in for trouble. Or in other words if you put that head back on with in a year you will blow the rings right out the bottom of the engine

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Old Gomer

05-31-2006 21:31:29




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 Re: Allis B Head in reply to old, 05-31-2006 08:25:23  
I just don"t see the relationship between repairing the valves/head and causing ring failure. Why would this be a problem?



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old

05-31-2006 22:29:35




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 Re: Allis B Head in reply to Old Gomer, 05-31-2006 21:31:29  
Very simple engine wear as a unit, I.E. Bad valves also means the rings will be close if not as bad as the valves. So when you just do a valve job you up the compreasion at the head but not at the rings so the rings will drop out the bottom. I've worked on engines almost 40 years and have seen way to many after a valve job and what it does to the bottom of the engine after

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dej(JED)

05-31-2006 06:46:02




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 Re: Allis B Head in reply to jeffalex2, 05-31-2006 04:48:12  
Be sure to clean the block surface before putting the head back on. You can also clean the carbon off of the piston tops. Make sure your torque wrench is accurate also. I sometimes reuse old head gaskets. I don't think you will though. You don't say whether you have redone the whole motor, but I would for sure consider removing the pistons and checking rods and rings etc.



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