Re: packard 1936 standard 8 1402 engine problems
Posted by Owen_Dyneto On 2014/4/3 16:19:46
In case you didn't have this information, minimum stem to guide clearance specifications (inches) are:
Intake: 0.0025
Exhaust: 0.004
PS - There are several ways to measure the clearance, most obviously a dial indicator. You could also use a good micrometer to measure the valve stem and then a "bore gauge" like the Starrett shown below (but in a smaller size range) to measure the inside diameter of the guide. The end of the gauge is an expandable split ball which is inserted into the bore and then the ball is expanded via the thumb screw until it contacts the bore accurately, and then withdrawn and measured with a micrometer. Though I have a dial indicator the bore gauge is my preferred method as you can make measurements at various positions along the length of the guide.
BTW, a fine looking car!
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Intake: 0.0025
Exhaust: 0.004
PS - There are several ways to measure the clearance, most obviously a dial indicator. You could also use a good micrometer to measure the valve stem and then a "bore gauge" like the Starrett shown below (but in a smaller size range) to measure the inside diameter of the guide. The end of the gauge is an expandable split ball which is inserted into the bore and then the ball is expanded via the thumb screw until it contacts the bore accurately, and then withdrawn and measured with a micrometer. Though I have a dial indicator the bore gauge is my preferred method as you can make measurements at various positions along the length of the guide.
BTW, a fine looking car!
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(100.78 KB)
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