Piston skirts is an important part of piston which covers the lowest. Piston skirt is responsible to keep piston from shaking unreasonably within the cylinder during working. Providing proper lubrication is the main task of Piston Skirts by holding and transporting oil to wall of the cylinder. To prevent scuffs on cylinder wall chemical layer coating is made on Piston Skirts which helps in proper lubrication.
Especially Heavy Diesel Engines requires proper lubrication in the cylinder walls and it requires special Piston Skirts which can perform lubrication process in heavy diesel engine.
Therefore, PIA has introduced High Performance diesel engine overhaul Piston Skits.
PAI’s Piston Skirts are treated with a new and highly developed anti-friction coating process. The coating is designed to lower scuffing and wear while providing a dry lubrication that is highly resistant to contamination, and reduces parasitic drag. HP-3 is a proprietary formulation of anti- friction coating applied to the piston skirt, to decrease friction on the cylinder walls.
As the largest friction area, the Cylinder Wall represents the largest loss of power and efficiency anywhere in the engine. HP-3 coating drastically reduces friction and allow for tighter clearances between the piston and the Cylinder Wall. This reduction in friction and clearance improves overall performance, lowers oil usage and oil temperature; ultimately increasing the life of the Skirt.
“HP-3 Coating drastically reduces friction and allow for tighter clearances between the piston and the Cylinder Wall.”
HP-3 Dry Film Lubricant coating is applied as a spray process. Different surface preparatory methods appropriate for the substrates are used prior to the coating process. Coating thickness is varied to suit the application. Typical coating thickness for piston skirts is 1 to 1.5 mil (12 to 37 microns).
Low coefﬁcient of friction, provides intermittent dry lubrication, Increased load carrying capacity, wear resistance, corrosion protection.
Navistar DT engine Series consists of 6 mid-range Diesel Engines. So, the horsepower ranges from 130Kw/170hp to 260KW/350hp. DT series engines are part of medium range heavy duty automotive like trucks, school buses, and other buses applications. Whereas other engines serve in the service applications.
Navistar International previously known as International Harvest company was producing diesel engines mainly for Agricultural and construction equipment.
The dt466 engine being considered legend among DT engine Series because of its endurance and performance. There is a famous saying regarding DT466 that:
“If DT466 isn’t Enduring than we don’t what is”.
With a displacement of 466 cubic inches, DT466 is Six-Cylinder, four cycle Diesel Engine. Bore size and stroke of DT466 are 11.6.5mm*118.9mm (4.59*4.68 inches). With the compression ratio of 16.5:1. At 1900 rpm it produces maximum 260HP output while at 1400 rpm the maximum torque output is 800 ft-lbs.
DT466 engine aspiration system turbocharged with wastegate technology. Also with air to air intercooled design. This is Because of its fuel injection combustion technology. DT466 Engine governed speed 2500rpm estimated.
Navistar Introduced Wet Sleeve design into diesel Engines. In this model, they created cylinder walls/sleeves as the separately machined part which helps and fits exactly into the upper counter bore it helps in sealing at the top with O-ring housing bores are cast into the engine block in the bottom.
In 2004 major update was made into DT engine series to meet the emission standards set by the Environmental Protection Agency of USA. For this purpose, a new EVRT turbocharger technology did introduce with movable turbo vanes which helped in improved boosting and reduced the lag. Improved electronically controlled hydraulic unit fuel injection system along with a new four-valve cylinder head and an exhaust Gas Recirculation to reduce emissions.
Despite its endurance from a mechanic point of view Wet Sleeve engines do require in chassis overhauls after the specific period.