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Tractor Talk Discussion Forum

No compression after changing head gasket

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Allis Trouble

04-03-2006 23:06:56




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We have a 35 WC that developed leaking between head and block. We took the head off and replaced the gasket. When we reassembled we cranked it over and we had no comprission. Thas tractor was a good runner before. What have we done wrong. All we removed was the head nothing else. Thanks for your help. Tyler




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Allis Trouble

04-04-2006 21:18:14




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
Thanks everyone for your imput. We ajusted the valves and she started on the second crank! you guys are great! Thanks again! Tyler



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old

04-04-2006 21:25:55




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-04-2006 21:18:14  
Some times the simple things are what get you. You will always remember this from now on because of the problems you have had. I hope you remember to retorque the head after you had it running. Retorque it when its hot. If you don't you will be in for more learning. LOL



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Barry A

04-04-2006 13:33:58




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
just a thought. have you changed or not replaced the valve cover gasket? I seem to remember that it should be quite thick mayby an 1/8" if its not thick enough the cover can hold the valves open. check for this by removing the cover and rechecking compression with cover off.

hope this helps.



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Nebraska Cowman

04-04-2006 10:05:06




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
You're doing fine Tyler. It is amazing what a man learns in his sleep.



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Allis Trouble

04-04-2006 08:32:20




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
No offence taken to all replys.

The head and block had not been cleaned when it was reassembled at a previous time. There was a lot of greese in between the gasket and hard surfaces. The head seemed to not have been torque down before as the head bolts were loose, in my opinion. I did how ever turn the engine over to clean all the gunk out of the cylinders that fell in when I removd the haed.

Answers to your questions: Yes the plugs are in. Yes I positioned the gasket prorerly with the marked side in the down position, "This side down." No I did not send the head out to be checked for warpness. It had new valves in it and I checked it with a straight edge and it appeared to be fine. After I climbed in bed last I thought about checking the valves so that may be the problem but I am willing to hear everyones ideas. No there is absolutely 0 lbs pressure on all cylinders. Yes I used a torque wrench and yes I tightened them to the specs.

Another question I have is could turning the motor over without the head on mess up the timming? How? I did not remove the cam just the head, rocker arms and push rods.

Let me have it if I have done something wrong. I am young and just learning. My dad is a big help but has limited knowlage.

Sorry for posting here but the Allis board seems to be down.

Thanks again for all your help i really appreacheate(?) it. Tyler

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old

04-04-2006 10:10:49




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-04-2006 08:32:20  
My guess would be you need to adjust the valves. When you cleaned up the block/head you removed probably enough stuff to how the valves not closeing as they should be and thats why you have 0 compression. Any time you do any thing like remove the head you need to reset the valves.



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Jon Hagen

04-04-2006 08:53:46




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-04-2006 08:32:20  
There is nothing to get out of line by turning the engine over with the head removed,and replacing the gasket is hard to get wrong to the point that there is no compression. The only thing that comes to mind is IF the new head gasket is thinner than the old one,it would have closed up the valve gap and MAY be holding the valves off their seat. Check the valve adjustment to see if You have any"tight" valves.

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Stan(PA)

04-04-2006 08:45:46




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-04-2006 08:32:20  
If you are using the compression gauge correctly, and actually have 0 compression, it has to be the valves hanging. Take the valve cover off, and turn it over. You should see the rocker arms moving up and down. Maybe you don"t have the pushrods seated against the cam followers (lifters). Is there a chance that your gauge is no good? Did you just try to start it?



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old

04-04-2006 08:24:38




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
You may have the gasket on wrong, theres a top and bottom to them. Also any time you remove the head you have to readjust the valves and if you didn't you may have valve that don't open or don't close. Any one of those thing can cause your problem.



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russys

04-04-2006 06:10:56




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
Put the plugs back in.



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Nebraska Cowman

04-04-2006 05:07:11




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
Are your valves closing? You need to readjust the rocker arms.



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frankiee

04-04-2006 04:27:30




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 Re: No compression after changing head gasket in reply to Allis Trouble, 04-03-2006 23:06:56  
So you have no compression in any of the cylinders or just the one That was leaking?
What do the compression readings say?



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Buzzman72

04-04-2006 05:03:26




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 Re: No compression after changing head gasket in reply to frankiee, 04-04-2006 04:27:30  
Did you torque the head in the proper sequence, in three steps? Did you use a torque wrench? Did you check--or have someone check--the head with a straightedge to see if it was warped? Did you actually check the compression with a compression gauge, or does it simply crank like there's no compression? Was your headgasket marked "top" on the top surface, and are you 100% sure you installed it that way?

Please don't get offended at these questions. Long-distance diagnosis is an inexact science at best, and without actually seeing what was done and how it was done, one can only guess what might have gone wrong and ask questions.

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