Carb vacuum port ID

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==Engine diagnosis using a vacuum gauge==
 
==Engine diagnosis using a vacuum gauge==
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*'''[[Vacuum gauge engine diagnosis]]'''
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*'''[[Finding vacuum leaks]]'''
 
*[http://www.classictruckshop.com/clubs/earlyburbs/projects/vac/uum.htm Vacuum gauge chart]
 
*[http://www.classictruckshop.com/clubs/earlyburbs/projects/vac/uum.htm Vacuum gauge chart]
 
*[http://www.secondchancegarage.com/public/186.cfm How to Use and Interpret a Vacuum Gauge]
 
*[http://www.secondchancegarage.com/public/186.cfm How to Use and Interpret a Vacuum Gauge]
 
*[http://www.gregsengine.com/using-a-vacuum-gauge.html Engine Testing with a Vacuum Gauge]
 
*[http://www.gregsengine.com/using-a-vacuum-gauge.html Engine Testing with a Vacuum Gauge]
  
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==Chart of diagnostic vacuum readings==
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==Table of diagnostic vacuum readings==
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<table>
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    <tr bgcolor="white">  
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bgcolor="white">  
 
       <td colspan="3">&nbsp;</td>
 
       <td colspan="3">&nbsp;</td>
 
     </tr>
 
     </tr>
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     <tr bgcolor="lightgrey">  
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     <tr bgcolor="#CCCCFF">  
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       <th width="26%">Engine Speed</th>
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       <th width="26%">ENGINE RPM</th>
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       <th width="28%">Reading</th>
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       <th width="28%">GAUGE READING</th>
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       <th width="46%">Indication of Engine Condition</th>
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       <th width="46%">ENGINE CONDITION</th>
 
     </tr>
 
     </tr>
 
     <tr bgcolor="white">  
 
     <tr bgcolor="white">  
 
       <td width="26%">Smooth and steady idle<br> (800 to 1200 RPM)</td>
 
       <td width="26%">Smooth and steady idle<br> (800 to 1200 RPM)</td>
 
       <td width="28%">Between 17 to 21 inches</td>
 
       <td width="28%">Between 17 to 21 inches</td>
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       <td width="46%">Engine is in Good Condition, but perform next test to be sure.</td>
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       <td width="46%">Engine is in good condition, but perform next test to be sure.</td>
 
     </tr><tr bgcolor="lightgrey">  
 
     </tr><tr bgcolor="lightgrey">  
 
       <td width="26%">Open and close throttle quickly</td>
 
       <td width="26%">Open and close throttle quickly</td>
 
       <td width="28%">Jumps from 2 to about 25 inches</td>
 
       <td width="28%">Jumps from 2 to about 25 inches</td>
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       <td width="46%">Engine is in Good Condition.</td>
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       <td width="46%">Engine is in good condition.</td>
 
     </tr><tr bgcolor="white">  
 
     </tr><tr bgcolor="white">  
 
       <td width="26%">Smooth and steady idle</td>
 
       <td width="26%">Smooth and steady idle</td>
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     </tr><tr bgcolor="white">  
 
     </tr><tr bgcolor="white">  
 
       <td width="26%">Steady idle</td>
 
       <td width="26%">Steady idle</td>
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       <td width="28%">Intermittent dropping back 3 or 5 divisions and returns to normal</td>
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       <td width="28%">Intermittent dropping back 3 to 5 inches and returns to normal</td>
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       <td width="46%">Sticky Valves. If injection of penetrating oil into intake manifold temporarily stops pointer from dropping back, it's certain the valves are sticking.</td>
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       <td width="46%">Sticky valves. If injection of penetrating oil into intake manifold temporarily stops pointer from dropping back, it's certain the valves are sticking.</td>
 
     </tr><tr bgcolor="lightgrey">  
 
     </tr><tr bgcolor="lightgrey">  
 
       <td width="26%">Steady 3000 RPM</td>
 
       <td width="26%">Steady 3000 RPM</td>
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       <td width="28%">Pointer fluctuates rapidly, faster engine speed causes more pointer swing</td>
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       <td width="28%">Pointer fluctuates rapidly, increasing engine speed causes more pointer swing</td>
 
       <td width="46%">Weak valve springs.</td>
 
       <td width="46%">Weak valve springs.</td>
 
     </tr><tr bgcolor="white">  
 
     </tr><tr bgcolor="white">  
 
       <td width="26%">Steady idle</td>
 
       <td width="26%">Steady idle</td>
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       <td width="28%">Fast fluctuation between 14 to 19 points</td>
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       <td width="28%">Fast fluctuation between 14 to 19 inches</td>
 
       <td width="46%">Worn intake valve stem guides. Excessive pointer vibration at all speeds indicates a leaky head gasket.</td>
 
       <td width="46%">Worn intake valve stem guides. Excessive pointer vibration at all speeds indicates a leaky head gasket.</td>
 
     </tr><tr bgcolor="lightgrey">  
 
     </tr><tr bgcolor="lightgrey">  
 
       <td width="26%">Steady idle</td>
 
       <td width="26%">Steady idle</td>
 
       <td width="28%">Constant drop</td>
 
       <td width="28%">Constant drop</td>
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       <td width="46%">Burnt valve or insufficient tappet clearance holding valve partly open or a spark plug occasionally miss firing.</td>
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       <td width="46%">Burnt valve or insufficient tappet clearance holding valve partly open or a spark plug occasionally misfiring.</td>
 
     </tr><tr bgcolor="white">  
 
     </tr><tr bgcolor="white">  
 
       <td width="26%">Steady idle</td>
 
       <td width="26%">Steady idle</td>
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       <td width="26%">Steady idle</td>
 
       <td width="26%">Steady idle</td>
 
       <td width="28%">Drifting from 14 to 16 inches</td>
 
       <td width="28%">Drifting from 14 to 16 inches</td>
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       <td width="46%">Plug gaps too close or points not synchronized..</td>
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       <td width="46%">Plug gaps too close or points not adjusted correctly. Damaged plug or
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</table>
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      coil wire</td>
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<br><br><br>
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[[Category:Carburetors]]
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[[Category:Engine]]
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[[Category:Good articles]]
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{{youcanedit}}
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Latest revision as of 07:34, 23 November 2024

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