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Case Tractors Discussion Forum

help or instructions on adjusting valves.

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09-14-2007 06:06:44

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Hello, need some help with the valve adjustment on my 800. Just finished putting the LP heads on and want to set the valves. Iím following the manual which says to set the #1 cyl at TDC which is when the #1 rods are loose and the #4 rods are tight and the #2 exhaust is tight. When I get it to what I think is TCD #1 the #1 rods are loose, #2 exh is tight and #4 exh is tight but #4 intake is loose. Also, and this is were Iím really unsure of whatís going on, the #1 exh is at 0.020Ē but the intake is around an 1/8Ē. Is this just really loose and needs adjustment or do I need to do the intake and exh separately? Also, the marks on the pulley are a bit different than the book (see picture). The book doesnít show the 5 marks on the right just one. I have it at TDC #1 at the far right mark and I canít find the other marks (for #2 & #3) around the pulley. Thanks for the help.

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09-17-2007 08:52:36

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
having worked as a case service tech for 20 years the easiest i have found is like the guy above remove #1 spark plug if you don't trust the marks. turn engine until the wooded dowel says piston is as close to top dead center as possible. check valves on cyl. 1 and 4 . if #1 valves are tight you are on tdc 4. if the valves are tight on 4 you are on #1 tdc. Set valves on first or last cyl. that is on firing cycle with loose valves. Set loose valves only on cyl 3, and 2 and forget cyl that had tight valves on cyl. one or four depending on which tdc you started with that are tight for now. turn engine again 1 full turn and the dowel says the piston one is all the way up again. check valves again this time set valves on the first or last cylinder that are loose and loose valves on cylinders 2 and 3. Having done that if you have put a dab of paint on each valve as you adjust them you will see you have set all 8 valves. This method works on 4, 6 or even 8 cylinder engines as long as they are inline engines. 4cyl. engines piston 1 and 4 go up and down at the same time. 6 cyl 1 and 6 go up and down at same time. same for 8 cyl 1 AND 8 GO UP AND DOWN SAME TIME. meaning one time cyl #1 is at top engine is at tdc on the firing cycle next time it is up cyl 1 is starting the intake cycle. The last cylinder does just the opposite when #1 is at firing the last cyl is starting the intake cycle when #1 starts intake cycle the last cylinder is on firing cycle Hopefully I have not muddyed the waters. Having used this method for 20 + years it is automatic for me no matter who made the engine. any questions email me palaliam@gmail.com

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09-17-2007 06:28:00

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
Thanks for the feedback. I believe I"ve got them adjusted using a combination of the methods below to adjust and double check. I am still amazed that the intakes were so far out. Granted, these are different heads but 0.100 to 1/8" seems a bit high on 3 of the 4 one was about 0.025". 2 exhausts were right on w/o adjustment 2 needed a little movement. Was going to start it and try things out but didn"t have a drop of gas in her and ran out of time. Maybe tomorrow night as its 4-H night tonight. thanks again.

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09-16-2007 05:25:25

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
Well, if it's a propane engine, it has spark plugs. I may not know the geometry of that engine well enough, but can you pull a plug and stick a dowel in there to feel when the piston reaches TDC? I do this on engines where I don't trust the timing marks. If the rockers are tight, it's TDC exhaust, and if the rockers are loose, it's TDC compression.

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Old Rusty

09-14-2007 15:12:18

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
Get valve overlap on #4 cyl -set # 1 Get overlap on #2 set #3 valve overlap on #4 set #1 overlap on #3 set #2.
Valve overlap is when one valve is just closing and the other is just starting to open. Valve overlap will work this way on all 4 6 and 8 cyl inline engines as they all have companion cylinders. When one cylinder is at top dead center on compression stroke the companion cylinder will be at valve overlap. Benn using this for more than 50 years. Have a good day

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09-14-2007 10:35:33

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
On all my engines, after rebuilding or performing mantainance, I just turn the engine over until a valve is open. Then adjust the valve next to it ON THE SAME CYLINDER. Mark each adjusted valve with white chalk or other identification. This method has worked for about 45 years for me. Late model engines could be different.

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09-14-2007 06:09:35

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:06:44  
third party image

Didn"t get the picture attached the 1st time.

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09-14-2007 08:36:14

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 Re: help or instructions on adjusting valves. in reply to INCase, 09-14-2007 06:09:35  
When #4 rockers change from exahust tight to intake tight that is TDC for #1. Then go 1/2 turn that will be #3 and #2 rockers will be just changing from ex to in. Another 1/2 turn and your TDC mark should line up again and #1 rockers should just be changing from ex to in this is where you have it to adjust #4. One more 1/2 turn #3 rockers should be changing now and thats where you set #2. Done it this way for 45 years, most times don"t even look for the timing marks just check the rockers. hth

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