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Farmall & IHC Tractors Discussion Forum
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Hard Starting 806

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Ryan

08-24-2005 05:58:26




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I have two 806 diesels, both have a fair amount of blowby, one has a turbo one does not. One tractor will start with 2 revolutions of the engine, the other I can barely get started. I have checked the timing, they both appear to be timed exactly the same (12 degrees at 50 degrees on the flywheel). I have changed the fuel filters, the oil, etc. and the injection pump and injectors are new. I have checked that there are no stuck valves. Any other suggestions? Can someone tell me what the valve clearance should be cold and if this would cause it to start so hard? It will roll over and act like it wants to go (it speeds up) but just keeps rolling over. I have also replaced the air filter with a new one.

Ryan

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K.B.-826

08-24-2005 20:16:38




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 Re: Hard Starting 806 in reply to Ryan, 08-24-2005 05:58:26  
Any chance the starter, batteries, and battery cables aren't 100%?



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the tractor vet

08-24-2005 16:18:13




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 Re: Hard Starting 806 in reply to Ryan, 08-24-2005 05:58:26  
If and 806 is a hard starter then it is time to pull her down and do a rebuild On the head and block . Valve resshion will cause hard start as this will drop the comp. ratio . When a D361 is wright they will start down to near 0 with out either . Now one thing you should know is that rebuilding a D361-407 is not for the novice mechanic as it has it"s quirks and i have seen way to many rebuilds done by guys that tell me OH I CAN DO THAT no problem and in anywhere from a few min. to 50 hours they throw a rod out the side of the block and bust the crank. Over time the block tweeks and when i do them i get them line BORED and decked and cut the counter bores then set the block up in the boring bar and bore off the center line of the crank and install .010 over slevesand PRESS them in not drive then ya must use a bore gauge and check for wrinkels and hone to fit each and every piston to it"s bore . THen ya double cross your fingers and grit your teeth and do three hail marys and if it makes it past the 50 hour mark it just may live 10000-20000 more hours .

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Jim Allen

08-24-2005 09:11:16




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 Re: Hard Starting 806 in reply to Ryan, 08-24-2005 05:58:26  
I agree with Allen. It's time for a compression test. A valve adjustment won't help, unless all of them are tight. In that case, you've got burned valves too. Excessive blowby is a sign of badly worn rings. A cylinder leakdown test will pinpoint the rings, but you can find out with a compression gauge too, by doing one test dry, then pumping in a few squirts of 40wt oil and doing it again. Compare the readings. If the reading goes up substantially with the oil, you have definitely got worn rings.

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Allan in NE

08-24-2005 06:59:24




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 Re: Hard Starting 806 in reply to Ryan, 08-24-2005 05:58:26  
Ryan,

Does it take a shot of ether to get 'er to run?

Boy, I dunno. Sure sounds like she is gettin' a little short on compression to me.

Allan



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Ryan

08-24-2005 09:52:01




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 Re: Hard Starting 806 in reply to Allan in NE, 08-24-2005 06:59:24  
When I did get it running finally it was because I had dumped some oil in the intake...However, the other 806 actually has more blow by but starts faster than my 4020 that is why I am suspecting something else is going on. I am having a hard time believing that compression alone is the culprit.

Ryan



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