2-stroke engines are well known for its white smoke and smoky exhaust fumes, but if the airtightness of the exhaust pipe mounting flanges and connections is compromised, unburned black engine oil can drip down from the overlapping gaps. High heat-resistant liquid gaskets are an effective countermeasure against "liquid leakage" at such high temperatures.
Have you ever had the problem of exhaust leaks in spite of the fact that you have replaced the gasket for the exhaust pipe flange with a new part? That's what makes a two-stroke engine unique. There are many factors that can contribute to such a problem. The fact that exhaust leaks and liquid leaks are caused by gaps in the components and tightening up of the parts is an obvious conclusion. The use of high heat-resistant liquid gaskets is very convenient for sealing such small gaps.
For example, when applied to the surface of the exhaust gaskets (in combination with liquid gaskets), the gasket capacity is increased to a higher level. When new gaskets are not available and used gaskets have to be reused, the use of liquid gaskets is a great way to increase the effectiveness of the gasket. If you can use the liquid gaskets in the right place at the right time, you will be able to experience the benefits of the gaskets for sure.
This is for exhaust leaks around the exhaust pipe and exhaust system!
The PERMATEX brand products are known for their high heat resistance. Its name is Ultra Copper (R) Gasket Maker. The heat resistant silicone liquid gasket is mixed with copper powder to provide a high level of sealing under high temperatures. This product is ideal for exhaust system and exhaust pipe related exhaust leaks and for improving the adhesion of gaskets used around cylinder heads.
Whether it is a high heat resistant liquid gasket or a standard silicone gasket, be sure to degrease and clean the affected area before applying it. When reusing liquid gaskets to areas where they have been used in the past, old gaskets are often stuck to the area, so make sure to remove such stuck-on dirt before applying a new liquid gasket.
Use like a glue to improve workability
There are some copper pipe ring products and heat resistant cloth and aluminum sheet products for tightening the exhaust pipe flange, however, it is easy for the gasket to fall out of the ring when the exhaust pipe is assembled and set. When the gasket is tightened under such conditions, the gasket can come off the seat surface and bite into the exhaust pipe, causing a large amount of exhaust gas to leak from the gap between the gasket and the exhaust pipe. One technique to improve workability is to use the adhesive strength of the high heat resistant liquid gasket to temporarily attach the gasket to the exhaust port.
The connection area where the tubular pipes are stacked on top of each other is known to be prone to exhaust leaks. The tubular rubber gaskets are often used for these locations, but after being reused many times, exhaust leaks are noticeable. However, it is not a good idea to replace the gaskets with new ones every time. Depending on the conditions, the exhaust leaks may not stop even after replacing the gasket with a new one. This is where the use of a high heat resistant liquid gasket comes in handy.
I'd like to replace it with a new O-ring, but the reality is ......
I'm sure there are many mechanics who have encountered such a case. The best thing to do is to replace the O-rings with new ones. If you replace the O-rings with new O-rings, you will not have to worry about oil leaks and seepage. However, depending on the time and circumstances, reusing a used one = the best you can do with the current situation. In such cases, a high-performance liquid gasket is also reliable.
Many models of four-stroke single-cylinder engines in the moped class have a built-in inspection cap for tappet adjustment. If you remove the tappet cap on an engine that has been running for many years, the O-ring may be completely flattened and stuck on. Replacing the O-ring on this part with a new one will definitely eliminate oil leakage and seepage. Ideally, it would be best to replace it with a new O-ring. However, there are times when parts are not available, and in such cases, a high-performance silicone-based liquid gasket can be used to avoid the problem.
As a rule, the gaskets and O-rings that were built into the disassembled parts have to be replaced with new parts. However, the inevitable reality is that there are some things out there that you can't control. The best way to deal with such a situation is to remove the gaskets and O-rings so that they don't cut, apply a liquid gasket to both sides, and then wait until they are raw and dry (pass them through an S-tube or wire and wait for them to dry). This will help the gasket to adhere more easily and minimize oil leakage and seepage.
Daytona, known for selling motorcycle parts and accessories and a variety of chemicals, offers a variety of liquid gaskets in a variety of single-use sizes. The product is available in grey/brown/white, depending on the user's needs, all of which are silicone-based liquid gaskets suitable for "thicker" applications. If you are using all three types of silicone gaskets, try the thicker ones for those areas where oil seepage is likely to occur.
POINT
- Point 1. There are various types of liquid gaskets, so choose the right one for the right place at the right time.
- Point 2. There are two types of silicone gaskets, one for thin and the other for thicker ones, so choose the one that best suits your situation.
- Point 3. In the case of engine parts, the sealing effect can be improved by using gaskets and O-rings in combination with commonly used gaskets and O-rings.
- Point 4. It can also be used as a temporary fixing adhesive when setting the gasket.
Prior to the '80s, liquid gaskets were not silicone-based or solvent-based like today's gaskets, but rather adhesives mixed with aluminum powder and other materials. In the early '80s, motorcycle manufacturers would soak paintbrush rollers in liquid gaskets, wring it on the net, and then rattle the rollers into the joints of the crankcase. A liquid gasket was used to seal the crankcase in such a method.
Prior to the 60's, liquid gaskets made from "glue", which was also used in various Japanese crafts, were sold as a raw material. When the machining accuracy of parts was not so good, oil leaks and seepage were likely to occur. This was the reason why this kind of adhesive was used. Depending on the part, there was a method of assembly in which a thick gasket was tightened between thicker gaskets, and a wire ring was used to secure the bolts to prevent them from coming loose. The development of high-performance engines and liquid gaskets were inseparable.
Silicone-based liquid gaskets became popular in the mid-1980s. With the advent of high-performance liquid gaskets, the maintenance environment and the level of maintenance perfection have changed significantly from the previous years. Silicone liquid gaskets were particularly popular in the cooling system of automobile engines, which used water-cooled systems in greater numbers than motorcycle engines. By using liquid gaskets at the joints of the radiator hoses and cooling water pipes, which often had water leakage problems, even a small amount of water leakage could be shut out. This was a shock to mechanics who knew the days of coconut fiber instead of gaskets.
Even with the same silicone-based liquid gasket, there are products with a particularly good sealing performance at high temperatures and products with high filling performance that maintain sealing performance even when the seal seat surface is distorted due to poor component accuracy. Recently, there are some engines that do not use paper or metal gaskets on the engine cover of the crankcase but only use liquid gaskets to maintain the seal. For such gasket-less areas, it is best to use thin silicone gaskets.
Solvent-based systems are often classified as either silicone-based or solvent-based, but solvent-based systems are most effective in places where gasoline is involved.
For example, the primary compression chamber of a two-stroke engine is the crank chamber itself. If the airtightness of the crank chamber, which is the primary compression of the mixture sucked in from the carburetor, is not maintained, the compression drops (compression drops out from the joints of the crankcase) and this will be a major cause of the power loss. The right choice is to use fuel-resistant liquid gaskets that are resistant to the fuel mixture.
Although there are various products of liquid gaskets nowadays, let's keep in mind to use them properly at the important point, because if you use them in the wrong way, it can lead to unfortunate results.