Head engine problem Brisbane - HOLE IN
Modern alloy cylinder heads suffer from holes in ports, holes under inserts etc. Some heads are faulty in manufacture and have produced what is referred to as a porous casting. However in most cases these problems are a result of poor maintenance. The shortfall is that generally not a lot of importance is placed on using the correct inhibitors and their on going maintenance. Alloy heads suffer from corrosion and poorly maintained heads can develop problems within a very short time...... visit Procedures and click on "Radiator Coolant" With the correct inhibitors properly maintained these problems can be eliminated. Most pin holes in ports are so small that they are undetectable with the eyes. In inlet ports the telltale sign is a washed look from the pin hole fanning out as it enters the valve area. In exhaust ports the carbon will be washed clean away from the pinhole fanning out into the exhaust manifold. Once the pinhole is located a small pricker will soon open up the hole. After grinding out in preparation for welding, the extent of corrosion found will determine whether the head should be repaired or replaced. More often than not a small pin hole will be the first breakthrough of a corroded area as big or bigger than a 20 cent coin. A hot pressure test and through visual inspection is necessary to evaluate the condition of the rest of the casting. These pin holes can appear anywhere on a cylinder head. Apart from ports, some of the places they have been found include, externally in the seating recess of the spark plug, the face of the head within 1/4mm of the head gasket sealing ring, externally out of the side of the head and in the machined valve spring pad area. Fortunately most can be repaired by engine reconditioners and with a changed maintenance schedule have a long serviceable life. For more information see head/ corrosion Disclaimer Agreement : Every care has been taken in writing this information and procedures, but no responsibility can be excepted for errors, omissions or misuse of this information and procedures. The information available on this site is for your instruction only and cannot be copied for sale, © copyright 2001 UMR Engines
Pressure testing head
Hole in combustion
chamber next to valve
seat
•
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Head engine problem Brisbane - HOLE
IN
Modern alloy cylinder heads suffer from holes in ports, holes under inserts etc. Some heads are faulty in manufacture and have produced what is referred to as a porous casting. However in most cases these problems are a result of poor maintenance. The shortfall is that generally not a lot of importance is placed on using the correct inhibitors and their on going maintenance. Alloy heads suffer from corrosion and poorly maintained heads can develop problems within a very short time...... visit Procedures and click on "Radiator Coolant" With the correct inhibitors properly maintained these problems can be eliminated. Most pin holes in ports are so small that they are undetectable with the eyes. In inlet ports the telltale sign is a washed look from the pin hole fanning out as it enters the valve area. In exhaust ports the carbon will be washed clean away from the pinhole fanning out into the exhaust manifold. Once the pinhole is located a small pricker will soon open up the hole. After grinding out in preparation for welding, the extent of corrosion found will determine whether the head should be repaired or replaced. More often than not a small pin hole will be the first breakthrough of a corroded area as big or bigger than a 20 cent coin. A hot pressure test and through visual inspection is necessary to evaluate the condition of the rest of the casting. These pin holes can appear anywhere on a cylinder head. Apart from ports, some of the places they have been found include, externally in the seating recess of the spark plug, the face of the head within 1/4mm of the head gasket sealing ring, externally out of the side of the head and in the machined valve spring pad area. Fortunately most can be repaired by engine reconditioners and with a changed maintenance schedule have a long serviceable life. For more information see head/ corrosion Disclaimer Agreement : Every care has been taken in writing this information and procedures, but no responsibility can be excepted for errors, omissions or misuse of this information and procedures. The information available on this site is for your instruction only and cannot be copied for sale, © copyright 2001 UMR Engines
Pressure testing head
Hole in combustion
chamber next to valve
seat
7 Moss Street, Slacks Creek, Qld 4127
