Join Date: Dec 2008
Location: St Louis, MO
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Passing on Info from a Ford Tech on 6.4L
Did heads on a 6.4 today
Just thought I would share my findings on the latest thing from ford. My primary job at the dealer is gas or diesel engine repair so I get the time consuming jobs that keep me indoors when its snowing out which is ok by me. So I had an 08 F450 come in around christmas time consuming coolant and hydraulic locking after sitting briefly. I ordered a pile of nuts, bolts, fuel lines, EGR coolers and a valve grind set using my 6.0 experience to get an idea of what ill need before taking it apart. Firstly this truck isnt a good example of a well maintained properly driven truck so dont get the idea (yet) that the 6.4 is a problem other than hard on fuel. This truck has a power program, sees duty at the local truck pull contest and is a work vehicle. If the customer wasnt well known to us, warranty would be void but lets not go there. I lifted the cab as is required on the 6.4 moreso than the 6.0, very tough to do anything major with the cab in place so up she went. I tore the engine down and found the EGR coolers were both toast, gallons of coolant ran out of the exhaust manifolds when I unbolted them. The head gasket between 6 and 8 cylinder was discoloured/burnt once inspected but the heads were still fine. A simple clean-up and gasket job was all that was needed along with the 2 coolers. I found the head bolts were improved over the 6.0 version and a few other changes intake manifold wise that were an improvement but the rest is a nightmare. None of the high pressure fuel lines (26,000psi to open the injectors with fuel) cant be reused once loosened, there are 10 of them and they all get torqued to spec then rotated 60 degrees - silly. The small coolant pipes are plastic and do not take kindly to bending which I found out on my first 6.4 repair a few months back. There are countless things that can be overlooked that entails cab removal again if not noticed at first, so double and triple checking is required with your face about an inch away from whatever you are inspecting so you dont miss a booboo. The cab captive nuts spin in the cab mounts already which means in 2 years good luck getting them apart without cutting and welding. This truck also needs a rad, 2nd time in 44K, they leak at the crimp on the side tanks.
For those of you that have your trucks serviced at places other than the dealer, beware that when fuel filters are replaced there's a special bleed tool and proceedure to prevent high pressure pump and injector failure due to airated fuel, this also applies if you run it out of fuel too. The high pressure pumps will grenade and send debris to the injectors = $$$$. Very sensitive and very expensive.
I think the 6.4 is a great engine, just not for the DIY'ers out there. Maintain it and have the dealer service it so you dont get boned by some lube kid that changes your fuel filters and wrecks your engine = no warranty.
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