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case 500 deisel


 
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roy prins
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PostPosted: Mon May 23, 2011 3:52 pm    Post subject: case 500 deisel Reply to specific post Reply with quote

my 500 starts perfectly and the fuel delivery and pressure seem fine, but it will miss a bit now and then when it is run at a higher rpm--any thoughts?? iam thinking injectors.
 
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Beagle
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PostPosted: Mon May 23, 2011 6:33 pm    Post subject: Re: case 500 deisel Reply to specific post Reply with quote

weak valve spring
 
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roy prins
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PostPosted: Tue May 24, 2011 4:52 pm    Post subject: Re: case 500 deisel Reply to specific post Reply with quote

hhhmmm-never thought that would be it-- i did put shims under the springs when i did the valve job -- do i need more or can i get new springs some where?
 
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mEl
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PostPosted: Wed May 25, 2011 3:20 am    Post subject: Re: case 500 deisel Reply to specific post Reply with quote


Roy, going out on a limb here but I would check the timing to be sure it is advanced enough. The logic, when a diesel is not advanced properly it will start excellent because the fuel is being injected closer to where the maximum heat is produced and run smooth at low to moderate rpm but at high rpm the injection is to late for a complete burn. This is a problem that the 188 diesels have when the transfer pump pressure drops to a point where the internal advance no longer works but the pump works ok otherwise. Many times I have manually advanced these engines by loosening the pump and turning it till the high rpm miss goes away as a stopgap measure to keep my customer working till the pump could be redone. Just another idea for you to consider. mEl
 
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