'75 stock crank pulley OD?....
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Thread: '75 stock crank pulley OD?....

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    UFOpel Investigator Site Supporter Aardvaark (R.I.P.)'s Avatar
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    '75 stock crank pulley OD?....

    A search didn't turn this up.
    Can someone tell me what the crankshaft pulley flange OD is that the 1975 engine uses for it's ignition timing mark? I want to mark mine for more then TDC and need to figure out the circumferential distance in inches/mm for each degree and can't get a good measurement with the engine in my Manta.
    TIA.
    -Mark
    -Mark
    '75 Manta
    Having invested my life savings into
    this Opel Manta. I expect big returns.😅
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    Member booeman's Avatar
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    Quote Originally Posted by Aardvaark View Post
    A search didn't turn this up.
    Can someone tell me what the crankshaft pulley flange OD is that the 1975 engine uses for it's ignition timing mark? I want to mark mine for more then TDC and need to figure out the circumferential distance in inches/mm for each degree and can't get a good measurement with the engine in my Manta.
    TIA.
    -Mark
    measure across the pulley to get your diameter and times that by 3.1415 (Pi) and divide that by 360 to get the distance traveled for 1 degree.I don't know the diameter of your pulley but here's an example; 5" X 3.1415 =15.7075/360 = .04363" for every 1 degree traveled around the circumference so 5 degrees would be .21815 (7 /32").
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    Member Gordy's Avatar
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    I have the pulley off of my 75 Manta to replace the front crank seal and water pump. I will look at it later today and give you a measurement. Gordy
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    UFOpel Investigator Site Supporter Aardvaark (R.I.P.)'s Avatar
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    Quote Originally Posted by booeman View Post
    measure across the pulley to get your diameter and times that by 3.1415 (Pi) and divide that by 360 to get the distance traveled for 1 degree.I don't know the diameter of your pulley but here's an example; 5" X 3.1415 =15.7075/360 = .04363" for every 1 degree traveled around the circumference so 5 degrees would be .21815 (7 /32").
    Thanks, but I only need the actual diameter. I'm a retired mechanical engineering technician.
    Last edited by Aardvaark (R.I.P.); 09-17-2007 at 09:36 AM.
    -Mark
    '75 Manta
    Having invested my life savings into
    this Opel Manta. I expect big returns.😅
    Link to my album of Opel catalogs
    and magazine articles:
    https://www.opelgt.com/photopost/show...ser/23031/sl/a
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    UFOpel Investigator Site Supporter Aardvaark (R.I.P.)'s Avatar
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    Quote Originally Posted by Gordy View Post
    I have the pulley off of my 75 Manta to replace the front crank seal and water pump. I will look at it later today and give you a measurement. Gordy
    Thanks. I appreciate your effort.
    -Mark
    '75 Manta
    Having invested my life savings into
    this Opel Manta. I expect big returns.😅
    Link to my album of Opel catalogs
    and magazine articles:
    https://www.opelgt.com/photopost/show...ser/23031/sl/a
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    Member Gordy's Avatar
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    the crank pulley measures 5 1/8 inches outer lip to outer lip.
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    UFOpel Investigator Site Supporter Aardvaark (R.I.P.)'s Avatar
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    Quote Originally Posted by Gordy View Post
    the crank pulley measures 5 1/8 inches outer lip to outer lip.
    Much thanks!
    -Mark
    '75 Manta
    Having invested my life savings into
    this Opel Manta. I expect big returns.😅
    Link to my album of Opel catalogs
    and magazine articles:
    https://www.opelgt.com/photopost/show...ser/23031/sl/a
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