Solving Engine Blow-By Problems

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Blow-by refers to excessive combustion and fuel vapors that have slipped pass the engines pistons. Its nasty, cooking hot vapors then mix with the engine oils in a negative way.

In years pass auto makers vented blow-by via a vent tube into the air. Vented to the air, blow-by harms and pollutes the air, causes breathing problems in the young, harms vegetation, and poisons water in lakes and rivers.

In many cases, blow-by and exhaust fumes both mixed with upper layers of atmosphere. There, a more harmful chemical reaction called smog, occurs. This happens when sunlight passes through it. Smog, a stronger poison conversion of blow-by further deepens the harmful aggravation to life and living things. Blow-by is not good!

With worldwide pressures and laws, car makers were forced to do something to stop or control blow-by, and limit harmful exhaust. It does so with anti-smog making systems for motors. We call these “emission controls” – and all engines now have them.

Normally, in a good engine, with clean internal conditions in the cylinder and combustion area of the motor, clean conditions limit combustions blow-by escape pass the pistons. What does escape is recycled back into the combustion for reuse. 25,000 fuel and combustion services keep the system clean.

Most engines require a “smog service” every 25,000 miles for a normal long life. Some brands of smog service additives also end the blow-by problem. We use those brands. At links given below.

Since the blow-by term refers to excessive amounts of blow-by pressure in the crankcase – it means, resources to properly remove blow-by are over taxed.

When it’s your engine problem – here’s how to handle its solution.

Blow-by can originate from 3 causes:

  1. Worn or sticky piston rings, or valve guides. Their wear gaps.
  2. A plugged up crankcase recirculating system. Can be stopped up.
  3. Leaking O-rings or gaskets in the pressure side of a supercharger.

Remedies:

  1. For problem one, it’s time for a new engine. [$4000 up]. However, additive treatments are available to return blow-by to normal, and gain years more good life from the engine. All at a fraction of new engine expense.
  2. For problem two. The engine crankcase ventilation system is not sucking out combustion blow-by. Not sending it to be re-burnt in the combustion cycle again. This can be from a dirty PCV Valve [under $25 replacement cost], or plugged up system orifice. Its usually a mechanic who will stick a wire into the orifice, and or spray carb cleaner into the orifice to open and restore its suction of crankcase blow-by fumes.
  3. For problem three. A mechanic skilled in the supercharger system will find the troublesome gasket or o-ring, replace them, and verify leakage of pressurized air into the motor has stopped. Ending that cause of blow-by.

 

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