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Classic/Antique Car Repair/Fitting Piston Pins-!939 Chevy 1/2ton
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Question
I have recently purchased a NOS set of GM pistons with the bushings and pins fitted in them. These pins are much tighter than a thumb push as recommended by the shop manual. There is no way they could be removed without being driven or pressed out. Is this tight fit okay?
The piston pins should be fitted for a thumb fit when lightly oiled. If the pistons came from the maker with the pins in them, I would get the pins out, lightly oil them and check the fit then. If they still seamed tight check with an auto machine shop near you and have them check the fit.
Brad
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| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | I followed Brad's instructions and everything worked perfectly. My piston pins just needed to be removed and lightly oiled. Thanks. | ||
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Answers by Expert:
Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience
Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials
More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors
Moto Award winner. And much more.
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