VALVE GUIDE and VALVE STEM OIL SEALS INFO

OLD "LEADED" HEAD

OLD "LEADED" HEAD VALVE GUIDE OD in MM ….... ; 12.73 mm

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OLD ”LEADED” HEAD EARLY TYPE VALVE STEM OIL SEAL

OLD ”LEADED” HEAD EARLY TYPE VALVE STEM OIL SEAL ; ID in MM ….... ; 14.87 mm

RUBBISH FIT since the Valve stem oil seal is 2.14 of a mm LARGER than the valve guide .

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OLD ”LEADED” HEAD LATER BETTER TYPE VALVE STEM OIL SEAL with EXTERNAL SPRING FITTED AS PER PHOTO ;

OLD ”LEADED” HEAD LATER BETTER TYPE VALVE STEM OIL SEAL with EXTERNAL SPRING FITTED ; ID in MM ….... ; 12.47 mm

CORRECT SEAL ; GOOD FIT ; since the Valve stem oil seal is .26 of a mm SMALLER than the valve guide it will be a nice gripping fit on the valve guide which is as it should be as it is the correct seal for this head .

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" UNLEADED HEAD "

" UNLEADED " HEAD VALVE GUIDE OD in MM ….... ; 11.99 mm

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CORRECT VALVE STEM OIL SEAL IS THE TYPE WHERE THE VALVE SPRING SITS ON TOP OF THE OIL SEAL AS PER THE FOLLOWING PHOTO ;

UNLEADED HEAD VALVE STEM OIL SEAL ; ID in MM ; 11.90 mm .

CORRECT SEAL ; GOOD FIT ; since the Valve stem oil seal is .09 of a mm SMALLER than the valve guide it will be a nice gripping fit on the valve guide which is as it should be as it is the correct seal for this head and it will not ride up the valve stem as the seal is held in place by the valve spring being on of the seal .

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