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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Detroit 2-71 in HD5

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09-18-2013 06:16:08

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Be prepared to use the rebuild kit. Its most likely the o-ring a the top around one or both liners. There is an o-ring at top that keeps coolant out of the airbox, and one at the bottom which keeps oil out to the airbox. If it has been ran without coolant or with low coolant, the heat without coolant present distorts and flattens the o-ring. The headgasket is a fire-ring for the most part. These things have no intake valves just ports in the liner center that allow the blower to fill the piston for upward movement and compression. Its scary how simple they are. You can do the field rebuild without pulling the block.

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george md

09-18-2013 08:52:38

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 Re: Detroit 2-71 in HD5 in reply to WayneB, 09-18-2013 06:16:08  
2-71 is a low block engine , it has head gasket like other engines and does not use the fire rings and perimeter gasket like later 71 series. Liners have no orings as they are dry liners, only the 53 and 92 series use wet upper liners.

Those engines crack in the air box ,you have the symptoms.

Take the air box covers off and put some air pressure in the cooling system, you should see the water show in the air box.


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