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John Deere Tractors Discussion Forum
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Re: Old 531/619 any relation to the new 12.5 ?

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DEEREMEYER1

12-05-2012 10:29:52
71.8.242.10



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The 10.5 and 12.5 have been EUI (electronic unit injector) equipped from the get-go, and also have overhead camshafts. The blocks actually look a little similar to late 7.6. It's a pretty small block relative to the displacement, but obviously moving the camshaft to the cylinder head allows for more bore and especially stroke relative to the size of the block. Good engines all the way around. I did have to go through one awhile back that had water pump bearing balls go through the timing gears. Not good. Got it all back together and had an oil leak. When the balls went through it shoved the camshaft up hard enough to crack the front cam bearing bore. So, it got torn down completely and rebuilt with a reman cylinder head.

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Tim S

12-05-2012 10:42:17
68.75.23.93



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 Re: Old 531/619 any relation to the new 12.5 ? in reply to DEEREMEYER1, 12-05-2012 10:29:52  
There is nothing good about a cam shaft driven water pump,,a bad idea from the start..



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DEEREMEYER1

12-06-2012 09:05:37
71.8.242.10



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 Re: Old 531/619 any relation to the new 12.5 ? in reply to Tim S, 12-05-2012 10:42:17  
I'm not a big fan, but a lot of engines use them and have for a long time.



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Tx Jim

12-05-2012 11:45:56
67.142.163.22



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 Re: Old 531/619 any relation to the new 12.5 ? in reply to Tim S, 12-05-2012 10:42:17  
Quoting Removed, click Modern View to see

Come on Tim admit it that if alternator belts break water pump keeps on pumping water. Seriously I hate the camshaft driven water pump on my 4255. I've already found antifreeze in the crankcase once.



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