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Overhead on a 12.7 lt Detroit diesel

I have a 2007 Freightliner Columbia with a detroit diesel 60 12.7 lt. with 714,000 miles on it. What would be the cost of a overhead and what is done when they do it. Also i live in Ga can anyone recommend a good shop to do the overhead.

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An overhead is a valve lash (and if needed jake brake and injector) adjustment. The valve cover is removed to expose the valvetrain for adjustment and usually takes 4-8 hours (depending on technician). Most dealerships have a set price that varies by engine but usually within $200-$350. The valve cover gasket may or may not be replaced - depends on shop and price of the rack.

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I would go with a shop that has a very good reputation for being thorough. I think it pays to not shop around for price to do an overhead. I imagine and heard that shops shortcut the job by only only adjusting the valves, injectors, and engine brakes that are severely out of spec; they put the feeler gage in or injector height measuring tool on, and if it feels close enough, they don't adjust. It seems that precision is very important here. I would go with a Detroit shop if you don't have any reliable recommendations for your area.

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An "overhead" is the adjustment of the valve train, including fuel injectors and engine brakes. My mechanic charges me around $150. I like to get it done about every 200,000 miles. On Detroit engines as the valve get out of adjustment they get tighter, they don't open are far as they should, so it make the engine harder to breathe.

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