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Allis Chalmers Discussion Forum
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Any tricks to removeing these bolts.

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old

06-08-2006 20:49:21




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Well my little C runs good now but it gets hot so I figure I need to remove and or replace the thermostat in it. I tried to remove the thermostat houseing from the other C engine I have but the bolts broke off right at the head. I don't want to do the same thing on the running engine, so is there any tricks on getting them out with out brakeing them off???
Thanks

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noncompos

06-10-2006 20:44:03




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
This's a bit late, and may well be way off base, but your posts didn't actually say it boiled, they said it ran hot, even though the guage didn't show it (weird), that it was always then low on water, that there were no visible leaks and no water in the oil "...so it must be boiling away...". If it doesn't get hot right away, you could be losing water into a comb chamber when running under load, not enough to make it miss/misfire but enough to lower the radiator level (and not a bad enough leak to leak when cooling/cold). Just a guess.

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bjb in NE

06-09-2006 07:17:40




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
This may seem counter intuitive, but try tightening them a bit. Get a breaker bar or open end wrench on them and alternate back and forth between loosening and tightening gently and gradually increase the force until they break loose (depending on the degredation of the bolts there may be nothing you can do to get them out with breaking them...a reducition in the diameter by 25% reduces the cross sectional area by 46%, which reduces the amount of torsion the bolt can handle by 46%)

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Dick L

06-09-2006 06:30:01




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
Heat! A lot of heat.



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jrlii

06-09-2006 21:55:34




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 Re: Any tricks to removeing these bolts. in reply to Dick L, 06-09-2006 06:30:01  
Spray 'em down good with Blaster a few days before you get serious about pulling 'em.

The tighten-before lostening trick often works too.

If it's being really stubborn I soak bolts with Blaster for a day or so then heat 'em with a torch then more blaster after they cool. Oxy-acetlyene works a lot better for this than propane - it's hotter and more concentrated heat. Part of the objective of heating is to chemically convert the rust to a more compact form.

BE PATIENT. Rushing to get out stuck bolts out is a good way to break 'em.

If they break off anyway, some of the major industrial suppliers (McMaster-Carr; MSC) stock left hand twist drills: That way you can drill 'em out while still trying to unscrew 'em. Easy-outs are a strictly last resort.

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JMS/MN

06-09-2006 07:10:28




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 Re: Any tricks to removeing these bolts. in reply to Dick L, 06-09-2006 06:30:01  
That, along with some candle wax.



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jeffalex2

06-09-2006 03:47:18




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
The housing bolts on mine didn't break, it was the little 1/4-20's that hold the plate on the bottom to retain the thermo and spring. Always replace motor bolts with grade 8, never stainless. Stainless sweats oils when exposed to high temperature, which almost becomes like locktite. If possible, see where your hardware store gets its nuts and bolts from...look on the box. U.S. and Japan steel is OK...avoid China steel if possible...it's really weak.

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BCnT

06-09-2006 01:02:59




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
can you get a screwdriver thru housing and hit thermostat? punch some holes thru it and see if it quits overheating before ya go to all the trouble of changing it.
i replace those kinda bolts with grade 8 covered with antisieze when i do replace em.



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old

06-09-2006 08:35:44




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 Re: Any tricks to removeing these bolts. in reply to BCnT, 06-09-2006 01:02:59  
Thats an idea that might just work. I think I can pull the gauge off and then get something in that way and sort of brake it up so water will flow. Funny thing is that the gauge never reads hot but when I check the radiator it is always low on water and I know its not going in to the oil and it doesn't leak it out so it has to be boiling it away. I also figure on doing a vinagar flush on it today and see if that helps. Maybe with punching a few holes in it and the flush it will stop overheating on me. I want to use it to pull a hay rake, I think it will run cheaper then the WD.
Thanks

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TexMac

06-08-2006 21:52:19




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
I don"t think so. I think it is like a B and the bolts pass thru the water chamber of the housing. I broke both on 2 heads also. Just carefully drill out and retap or use helicoils and replace with stainless slopped with marine grease. I hope I don"t have to remove mine again for another 65 years, but I"ll let you know if the stainless worked any better than the originals then.(Big Smile)



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souNdguy

06-08-2006 21:01:21




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 Re: Any tricks to removeing these bolts. in reply to old, 06-08-2006 20:49:21  
Just stop turning then -right- before they break off!

Soundguy



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