Why Are Cylinder Head Dowels Important?
Author: Sajid Ali
Main Points to Consider While Repairing Navistar DT466 Engine Cylinder Block
Navistar DT466 Engine Specifications & Application
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.
Major Update In International DT Engine Series
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.
Importance of Quality Piston Skirt In Diesel Engine Overhaul Process
Role of Piston Skirts In Diesel Engine
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.
PIA’s Piston Skirts
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 Process
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).
Advantages
Low coefficient of friction, provides intermittent dry lubrication, Increased load carrying capacity, wear resistance, corrosion protection.
Caterpillar C15 Diesel Engine
Lean, Mean, And Clean
Diesel has always been the bad boy among all fossil fuels. There is good diesel and bad diesel depending on the exact process of converting the crude to the diesel you get at the stations. Diesel is still cheaper than gasoline or petrol and it is still the go to fuel for commercial vehicles. With tightening environmental norms and emission regulations, diesel engines are facing a tough task. Add to that the reducing mileage because of focus on emissions or the clogged diesel particular filters and the owners of commercial vehicles, truckers and transport companies are having a tough time.
While diesel engines have been getting a bad name, there is the Caterpillar C15 diesel engine that is lean, mean and clean. The Caterpillar C15 is expected to clock 1,000,000 miles. The engine can power semis where the total gross weight of the vehicle will be up to 80,000 pounds. The engine is clearly robust and omnipotent. It can run rigs that require steady power and an excessive torque. The C15 diesel engine is powered by ACERT or Advanced Combustion Emissions Reduction Technology to adhere to the stringent emission regulations.
Designed to be sturdy
The Caterpillar C15 diesel engine is designed to be sturdy, to offer enough boost to endure compression and facilitate precise injection events so fuel is used as efficiently as realistically possible. The engine is more efficient than its counterparts and that again helps in fuel economy, especially during regeneration.
The Caterpillar C15 diesel engine has a compression ratio of 18.1, it has mechanically actuated electronically controlled unit injection system or MEUI, there are two turbo charges and the engine is controlled by Caterpillar’s ADEM A4 ECM. The sturdy street pistons, four-bolt connecting rods, 300,000 mile particulate filter, 20,000 miles of oil change interval and expected engine life of at least 1,000,000 miles ensure you have a durable engine. The Caterpillar C15 diesel engine has displacement of 15.2L, the available power levels are 435-625 hp at 2,100 rmp, the engine weighs 2,890 pounds and has an oil capacity of 41 quarts.