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Case Tractors Discussion Forum
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David brown 990A

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caseman-d

02-15-2008 13:33:18




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customer try to overhaul a Case DB 990A, serial 486903. Engone is the AD4/47 AIT serial 65019. we were looking for exhaust valve K900417. Case subs to K914528 which is suppose to be a intake valve. Did David Brown use the same valves for exhaust and intake. Email is open or call during day 1-800-756-3052 and ask for Tom.
caseman-d




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richardinnz

02-16-2008 18:21:34




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 Re: David brown 990A in reply to caseman-d, 02-15-2008 13:33:18  
Valves are dimensionaly the same, but different material, that has now changed so you now use the same valve. I think the springs are different, job to remember but I think they had paint identification. Hope this helps, Richard.



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davebr

02-16-2008 06:17:50




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 Re: David brown 990A in reply to caseman-d, 02-15-2008 13:33:18  
Let me clarify, the book showed two different valves but one was not available any more so they use the same like the other engines. The machine shop had no problems at all. Tractor runs great.

Dave



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caseman-d

02-15-2008 18:27:09




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 Re: David brown 990A in reply to Tom Railsback, 02-15-2008 13:33:18  
Thats what we kinda thought, but being 3rd party and not seeing the valves it was hard to convince the customer. Other engines showed the valves to be the same but this one was showing different ones. Thanks for the reply.

caseman-d



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davebr

02-15-2008 18:00:35




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 Re: David brown 990A in reply to caseman-d, 02-15-2008 13:33:18  
Caseman-d, I just rebuilt a 990 and the valves were the same.

Dave Brown



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