Valve System Service

Problem

Valve sticking.

Cause

Deposits on valve stem. Worn valve guide. Warped valve stem. Insufficient oil. Overheating valves.

Solution

Clean or remove valve stem deposits. Replace valve. Check oil or service lubricating system.

Problem

Valve burning.

Cause

Valve sticking. Distorted valve seat. Valve tappet clearance too small. Spring cocked or weak. Overheated engine. Lean air fuel mixture. Preignition. Detonation. Valve seat leakage

Solution

Check cooling system, tighten cylinder head bolts.  Adjust.  Replace spring.  Check cooling system.  Service fuel system.  Clean carbon from engine, use cooler plugs.  Adjust ignition timing, use higher octane fuel.  Replace valve face and seat.  Replace valve guide.

Problem

Valve breakage.

Cause

Valve burning.  Detonation.  Excessive valve tappet clearance.  Valve sticking.  Scratches on valve system.

Solution

Adjust ignition timing, use higher octane fuel.  Adjust.  Replace valve.

Problem

Valve-face wear

Cause

Excessive valve tappet clearance.  Dirt on face.

Solution

Adjust.  Clean, check air cleaner.

Problem

Valve deposits

Cause

Carbon from rich mixture.  Worn valve guides.  Carbon from poor combustion.  Dirty or wrong oil.

Solution

Service fuel system.  Replace.  Service fuel system, ignition or service engine.  Replace oil.

Valve Trouble Service

Problem
Valve is sticking.
Cause
There are deposits on valve stem. Worn valve guide. Warped valve stem. There is insufficient oil. The valves are overheating.
Solution
Clean or remove the deposits. Replace the valve. Check the oil, service the lubricating system.

Problem

Valve burning.

Cause

Valve is sticking. The valve seat id distorted. The valve tappet clearance is too small. Spring cocked or weak. The engine is overheated. Lean air fuel mixture. Pre ignition problem. Detonation problem. The valve seat has leakage. Loose valve guide.

Solution

Check cooling system and tighten the cylinder head bolts.  Adjust the valve tappet clearance. Replace spring. Check cooling system. Service fuel system. Clean carbon from engine and use cooler plugs. Adjust the ignition timing and use higher octane fuel. Relap valve face and seat. Replace valve guide.

Problem

Valve breakage.

Cause

The valve is burning. Detonation problem. Excessive valve tappet clearance. The valve is sticking. There are scratches on valve stem.

Solution

Adjust the ignition timing and use higher octane fuel. Adjust valve tappet clearance. Replace valve.

Problem

Valve face wear.

Cause

Excessive valve tappet clearance. Dirt on face valve.

Solution

Adjust the valve tappet clearance. Clean and check air cleaner.

Problem

Valve deposits.

Cause

There is carbon from rich mixture. The valve guides are worn. There is carbon from poor combustion. Used of dirty and wrong oil. 

Solution

Service fuel system. Replace worn valve guides. Service fuel system, ignition or service engine. Replace oil.

Engine Classification

Engine Classification according to Fuel Used

Gasoline Engine uses gasoline as fuel. This engine uses carburetor to mix fuel with air and form it into a vaporized form before it goes into the cylinder and ignited by spark plug.

Diesel Engine uses crude oil as fuel. Air is compressed to rise up temperature and fuel is injected into cylinder in atomized form. Hot compressed air ignites the fuel.

Engine Classification according to Method of Cooling

Indirect Cooling System usually called water engine. Water circulates inside the engine through water jackets and absorbs heat to maintain engine operating temperature. Hot water is being cooled to the radiator.

Direct Cooling System usually called air cooled engine. Air is blown by the blower to the engine body with air fins to absorb heat.

Engine Classification according to Cylinder Arrangement

Vertical or Inline Engine has cylinders have vertical center lines arrange one after the other.

Horizontal Engine has engine with horizontal center line of cylinders.

V Type Engine has engine block or cylinders resembles a letter V shape.

Radial Engine has cylinders arranged in radial manner.

Engine Classification according to Valve Arrangement

T Head Arrangement has valves arranged in both side of cylinder block. All intake valves in one side all exhaust on the other side.

L Head Engine has intake and exhaust valves arrange in one side of cylinder block.

F Head Engine have intake valves in the cylinder head and exhaust valves on one side of cylinder block.

I Head Engine has all intake and exhaust valves located in the cylinder head block.