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Old Nov 2, 2014 | 08:12 PM
  #1  
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money pit 69
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351W rebuild

Hello just wondering if anyone might have a input. I bought a low mileage used 351w to replace the one in my 1987 F-250 4x4. Before I put it in I'm replacing such as oil pump, water pump, gaskets, timing set and normal little parts. My question is should I replace the harmonic balancer and is there anything else you can think of.
Also did the factory use cork gaskets or has this been opened before. It's awful clean inside.
THX David
 
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Old Nov 3, 2014 | 06:52 PM
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If the rubber in the harmonic balancer is rotted then it's time for a new one...otherwise you should be fine.
 
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Old Nov 3, 2014 | 07:40 PM
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THX for the info. I'm removing it tomorrow I'll look it over good.
 
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Old Nov 4, 2014 | 09:30 AM
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Yeah check the alignment of the balancer timing marks when #1 piston is TDC on the compression stroke, if they don't line up then the rubber has broken lose and the balancer is junk.
 
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Old Nov 4, 2014 | 10:32 AM
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Paul, I feel like I should know the answer to this, but it is completely escaping me. Can you tell the compression stroke on #1 without pulling the valve cover? (I too need to verify balancer, plus realign distributor because I forgot to mark rotor position when I pulled it.)
 
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Old Nov 4, 2014 | 02:56 PM
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Pull the spark plug, put a thumb over the hole and have somebody rotate the crank by hand with a breaker bar until you feel air being pushed out. Slowly continue doing this until it's no longer pushing air and then use a piece of stiff wire(coat hanger) in the plug hole to feel the piston reach TDC.
 
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Old Nov 4, 2014 | 06:24 PM
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Yup. That's what I was trying to remember, the thumb over the hole. I wish my mind wasn't so full of mush lately. Thanks much.
 
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Old Nov 6, 2014 | 02:16 AM
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. To accurately find TDC you'll need a piston stop tool (~$5) that screws into #1 sparkplug hole...
 
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