It is highly important to do regular oil changes and using high-quality motor oil that meets Ford's lubricity requirements for this diesel engine. Overall the 6.7 Power Stroke engine has proven to be a very robust engine. Coolant leakages are possible around the turbocharger area and from the primary radiator of the cooling system. There are also problems related to some soot clogging on the EGR cooler and EGR valve, issues with EGR temperature sensor, and plugged DPF filters as well. It is safe to replace them with the updated ones. Turbo failures are reported so far mostly on 20 models.Įngines produced in 2011 had weak glow plugs, which can potentially break off and lead to massive engine damage inside the cylinders.
Latest engines are fitted with another turbocharger unit, which has more reliable steel ball bearings on the turbo shaft.
The first years of production, engines have a fairly complicated turbocharger with ceramic bearings (the tiny GT32 SST), which were prone to premature failure. Turbocharger failure is the biggest what can happen to the 6.7 Power Stroke. That will reduce the risk of head bolt stretch and head gasket failure - blown head gasket and coolant/oil inside cylinder. One of the big improvements in term of reliability is that the 6.7L Power stroke no longer would rely on four bolts per cylinder holding down the cylinder heads. With made improvements, the engine is able to produce even more power.Ħ.7 Power Stroke Engine Problems and Reliabilityįord's 6.7L Power Stroke diesels are solid engines, extremely durable, and reliable, with only a few problems/issues. The fuel system also was upgraded with a higher-flowing Bosh CP4.2 high-pressure fuel pump with a larger stroke and optimized injector nozzles. The GT37 features a larger 88 mm compressor wheel as well as increased turbine wheel to 72.5 mm up from 64 mm in the GT32. In 2015, the GT32 SST turbocharger was replaced by the Garrett GT37 with single VGT. The fuel injectors are capable of pulling off five events per combustion cycle. The Bosch CP4.2 fuel pump supplies fuel under a 30,000 psi for the 19 mm Piezo actuated Bosch injectors with 8 hole nozzles. The 6.7L Power Stroke is equipped with a high-pressure common rail direct injection. The primary and powertrain cooling systems have their own water pump, thermostats, degas bottle, and radiator. This powertrain secondary cooling system is also used for cooling of EGR circuit, transmission fluid, and fuel cooler. The compressed and hot intake air is cooled by a water-to-air intercooler which is connected to a secondary cooling system of the engine. The exhaust volume of this system is smaller, providing a much more dynamically responsiveness of the engine. In engine valley, there is also a Garrett GT32 DualBoost variable geometry single sequential turbocharger (SST). The intake air goes through ports inside the valve covers, while the exhaust gases into exhaust manifolds located in the lifter valley (in a traditional V8 engine, the exhaust exits from the outside). Every valve is equipped with its own rocker arm and pushrod. Each cylinder has for valves (two intake and two exhaust valves 32 valves total). All 6.7L blocks are manufactured by American foundry company, Tupy.įirst for the truck segment, Ford's 6.7L Power Stroke uses cast-aluminum cylinder heads. This affects positively on engine longevity. The engine was equipped with piston cooling jets for lower piston and combustion temperatures. The connecting rods have an end cap that is rotated 45 degrees to increase strength. The 6.7 Power stroke also features a steel crankshaft, powdered-metal cracked-cap connecting rods made by Mahle, and Federal Mogul cast-aluminum pistons.
This block layout in addition to the CGI material provides significant weight savings over the 6.4L predecessor. Its deep-skirt block also has nodular iron six-bolt main caps highly common on the 7.3L Power Stroke instead of the 6.4L's bed plate. While the majority of current diesel engines use heavy cast iron, the 6.7L Power Stroke has a cylinder block made from compacted graphite iron (CGI).
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