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Hand Start Compression

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Wayne A

12-10-2000 09:33:54




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Still trying to start a '35 B by hand (can't try to pull start it right now). From my earlier posts people have traced the problem to possibly be a lack of compression. I finally got a guage on it and if I spray a little oil in the cylinders I can get it up to 30lbs but that is about it. Is that enough to make it start? I can get it to pop but that is about it. The tractor hasn't run in 2 years (why I sprayed oil in the cylinders to help it out). Thanks, Wayne

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J I

12-14-2000 07:10:40




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
Heard from several to try starting fluid ...try some spray WD 40 in it as it will lube as well as act as a combustion starter as well which is better than either I believe and try to start it from the belt as advised by Tractorboy ..... has worked for me on older engines that have set for a while.



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roy

12-14-2000 08:54:54




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 Re: Re: Hand Start Compression in reply to J I , 12-14-2000 07:10:40  
WD-40 won't work as a starting fluid any more. they took most of the combustable fluid out of it for safty reasons. it can now be used to clean distributor caps without fear of blowing them off the distributor. ain't life grand.



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Wayne A

12-11-2000 15:52:32




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
Thanks everybody, this is pretty much what I figured but it is nice to be reassured. I'll try more oil and maybe some starting fluid. I sure wish I could pull start it now but I can't until I get the steel lugs off it. If I look at the valves are there any gotcha's to look out for when taking the valve cover off? It looks pretty straight forward from the shop manual but I'd like to be sure. Thanks agian for all the help, Wayne

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Tractorboy

12-11-2000 08:45:03




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
Evidently you have not had the motor apart and overhauled it or you would have a lot more compression . So have you got another Deere that you can pull up beside it and belt it for a while pouring in some oil and freeing up the rings and valves .Sometimes this will work .After you belt a while put the spark and gas to it and start it up .The next time it will pop off by itself .Good luck ,otherwise take it down and overhaul it and then it will fire off. (thats my 4 cents worth)

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Bill

12-10-2000 13:29:51




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
I think I read your post earlier. You might have your plug wires crossed. I think the top wire goes to the left side, might move your mag alittle also. I also agree on other posts. Just trying to help.



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John T

12-10-2000 12:18:33




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
Wayne, yeah thats sure low compression, but since its set a good while, I wouldnt get to worried just yet. In my opinion, if you can pull start it to get the rings and walls lubed up and the rings freed up a bit, it may be way easier the next time. The oil insertion will eventually work if you can plenty in there and worked all around in the cylinders, but it may sure foul the plugs also if they get oil covered. I have seen engines set long periods that didnt seem to have any compression, but once started and lubed and freed up, they werent so bad. Good Luck but be careful about oil coating and fouling those plugs. Have you tried any starting fluid?? John T

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clooney

12-10-2000 10:37:36




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
Wayne, 30 psi is a little on the low side. Try putting more oil in he cylinders, if you only put a little in it probably hasn't lubed the top of the piston or cylinder walls yet. You might want to take an old spark plug & knock the center out, then weld an air fitting to it, then blow compressed air in the cylinders & see where it comes out (make sure the valves are closed on the cylinder you do this on or you will get a false reading). If you put a lot of oil in the cylinders you might want to make sure the front of the tractor is higher than the back so eventually the extra oil will drain back into the crankcase. Sometimes on those old tractors it doesn't hurt to put a couple of cans of 2 cycle oil in the gas tank to lube the upper end while you are turning it over & idling it as the top of the cylinder doesn't get much oil at idle or while cranking. You really should pull it to get it started, then run it at high idle for a while then see how it starts, especially if it has sat for a long time.

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Donny-B

12-10-2000 10:08:28




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 Re: Hand Start Compression in reply to Wayne A, 12-10-2000 09:33:54  
The service manual I have says 70# cranking pressure per cylinder for a B. If you put oil into the cylinders before the compression test and still only got 30psi I would look at maybe a stuck (not closing completly) or burnt valve. Maybe a blown head gasket?



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