What is a piston ring?
Piston rings are fitted to seal the gap between the liner and the piston. An integral piston part, marine piston rings play a pivotal role in ensuring that the diesel engine functions perfectly. They are produced and classified according to their purpose.
Piston rings in a marine diesel engine
Similar to other types of internal combustion engines, a marine diesel engine operates with three or more types of piston rings. The smooth and efficient operation of a marine diesel engine relies heavily on the secured sealing of the piston rings and liners.
Functions of marine piston rings
• Compression gas seal – Compression piston rings guarantee that there is limited leakage, which can result in decreased gas compression pressure. A leak in gas compression will lead to insufficient power to fuel the engine and a significant increase in fuel consumption.
• Lubricating oil – Piston rings also spread the lubricating oil as it moves up and down the cylinder liner thousands of times per minute. This makes the piston operate smoothly, reducing the risk of friction and scuffing between metal parts.
• Heat regulator – During gas ignition, the temperature inside a piston can go up to 300 degrees Celsius. If this goes further, intense undistributed heat can damage the engine. Piston rings help regulate the temperature inside by releasing and transferring heat from the piston crown to the cylinder.
• A barrier – A piston ring acts as a barrier between the piston and the cylinder wall, which prevents frictional force and eventually engine failure.
High-quality marine piston rings
Precision Products UK is a leading manufacturer and supplier of excellent quality marine piston rings to clients all over the world. We design and manufacture our own extensive range of piston rings to specifically meet the unique requirements of medium and large bore marine engines.
For more information about our marine piston rings, as well as other related products and services, please contact the Precision Products UK team by calling +44 1246 261621 or sending an email at firstname.lastname@example.org.
To ensure that a marine engine will run efficiently at all times, a great deal of time, effort and resources must be invested, whilst also considering the complexity and number of parts it has. However, it is not uncommon to run into a few problems that can cause complications when taking the ship from one port to another.
To be better prepared and remedy these setbacks, we have compiled the most common problems you should be aware of when it comes to dealing with marine engines.
Because the air control is constantly in an open position when the engine is in use, leakages in this area are often overlooked. Perform an intentional blackout for all the machinery to be in the ‘stop’ position so that it will be easy to locate the hissing noise or the leakage. This problem can be resolved by simply tightening or replacing the affected pipes or joints.
Fuel leakage or fuel valve malfunction
If there is an anomaly with the fuel treatment or the fuel temperature is not properly maintained, it will lead to cracks and leakages in the fuel system, especially in the fuel valve. To avoid this from happening, the ‘high-pressure leak off tank’ level and alarm must be constantly supervised.
Sparks in the main engine exhaust
Due to the boats/ships constantly slow sailing and frequent manoeuvrings, sparks from the main engine’s exhaust may occur occasionally, which leaves soot deposits on the EGB boiler path. Schedule a monthly cleaning of the exhaust gas boiler to avoid this issue.
Stuck fuel rack
There may be times when there is an alteration in the engines RPM or the engine will not even start at all, especially with 2 stroke marine engines. This usually happens when the fuel rack gets stuck, resulting in a lack of fuel supply to the concerned unit. To prevent this from happening, ensure that the mechanical links are well lubricated and greased at all times.
Faulty alarms and sensors
The main engine is equipped with different sensors that measure and transmit actual data to the alarm console. However, these sensors may crash due to factors such as vibration, high temperature, humidity and dust. To avoid receiving false distress signals regularly check all engine room sensors and alarms.
Precision Products UK specialise in a comprehensive range of piston ring solutions for medium to large bore engines. Whether you have a new build, engine service or refurbishment demands, we’re sure to offer you the ideal solution. Click here or more information on how you can place an order.
If engine design is of interest for you, then you may have already heard of the two main types of internal powered combustion engines which are the 2 stroke and 4 stroke engines. The term ‘stroke’ refers to the movement or cycle of the piston in the engine. For you to better understand the functions of these engines and choose the one that is most suitable for your business’ need, read on to know about the differences of each.
How The Engines Work
- A 2 stroke engine has ports which make its design much simpler whilst a 4 stroke engine appears to have a complicated design due to its valve mechanism.
- 4 stroke engines are comparatively heavier in contrast to 2 stroke engines.
- The top side of the piston on a 4 stroke engine is flat whilst a bump or protuberance may be needed on the top side of a 2 stroke engine’s piston.
- Whilst a 2 stroke engine becomes loud when operating, a 4 stroke engine makes less noise in comparison.
- A 4 stroke engine completes 2 rotations of the crankshaft after finishing one cycle, where a 2 stroke engine completes only 1.
- With a 4 stroke engine, power is produced once every 4 strokes of the piston whilst power is produced every 2 strokes in a 2 stroke engine.
- Regular addition of oil is required for a 2 stroke engine, unlike a 4 stroke engine.
- With a 2 stroke engine, the air-fuel mixture enters through the inlet port and travels to the combustion chamber, passing through the crankcase. The mixture on a 4 stroke engine, on the other hand, remains in the combustion chamber only.
A leading established brand for a significant number of 2 stroke and 4 stroke diesel engines, we, at Precision Products UK, continue to combine our key strengths of quality, speed and flexibility with our extensive range of materials and coatings. Our products are proudly manufactured here in the UK and are supplied worldwide. Give us a call on +44 1246 261621 to discuss your project with us today.
Marine piston rings are an important part of the compression system in a 2 stroke or a 4 stroke engine. To ensure that the piston rings will perform thoroughly, it is important to know the required properties and types of piston rings used for specific purposes.
TYPES OF PISTON RINGS
Compression piston rings for two stroke large engines seal the chamber to prevent high-temperature combustion gases from escaping whilst distributing the oil on the liner surface.
Apart from ensuring that the piston rings have a similar thermal expansion to that of the cylinder liner, listed below are some of the major mechanical properties of piston rings that maintain their optimum clearances:
- Low Friction and Self Lubricating
- Load Bearing
- Corrosion Resistant
- Good Heat Transfer
- Innate Hardness for Wear Resistance
Ring clearances are essential to allow movements and thermal expansion. Here are two kinds of clearances you should know about:
- Vertical Clearance
This clearance is important for free movement during operation and must be kept to a minimum to avoid ring hammering and ring groove wear. However, when the vertical clearance is insufficient, it may cause rings to stick in the groove or break as they come up to operating temperature.
- Gap Clearance
Whilst gap clearance should never close completely, it must be as small as possible and should be maintained within a range of 0.4 – 0.5 per cent of a cylinder bore. The ring may break due to the restriction on its thermal expansion when coming up to working temperature if the ring gap is too small. Keep in mind that too small a gap may cause an increase in liner wear or lead to liner scuffing due to the oil film breaking down.
Based in Chesterfield, UK, Precision Products UK specialises in the design and production of piston rings and metallic seals that are all manufactured here in the UK. We supply expert products and services to customers from different industries worldwide. Click here to know how you can order or contact us via +44 1246 261621 for more information.
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We keep this Policy under regular review. This Policy was last updated in May 2018.