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post #1 of 5 Old 05-16-2006, 09:23 AM Thread Starter
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OK Need more help

My question today is one I will probably regret forever but what the hell. If you dont know the answer its better to ask someone. I got a 99 350 and I took it to a dealership to talk about trading it. Well upon there inspection of my stroker they closed the hood and told me that I had blow by. What the hell is it and how do I fix it. Hope yall can help cause its a pain in the butt to try and sell a truck with mechanical problems.
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post #2 of 5 Old 05-16-2006, 09:34 AM
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Doesn't that have to do with oil and your pcv valve?

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post #3 of 5 Old 05-16-2006, 09:57 AM
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if they are talking about a little oil in the IC pipe thats normal, unless theres tons of it, but a little is to be expected.

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post #4 of 5 Old 05-16-2006, 10:10 AM
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blow by is when your crankcase will build pressure and blows oil by seals, easiest way to check for blow by is to remove the oil cap with the motor running and see if it starts huffing at you. you should be able to put your hand over the hole and feel little or no pressure.
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post #5 of 5 Old 05-16-2006, 02:33 PM
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Blow by....

If the engine is tired, rings are worn, the combustion gasses can "Blow By" the rings from the combustion chamber and put combustion gas in the crankcase. When you remove the oil filler cap of a worn motor, it will be blowing oil vapour up at you.... It is one of the first things a good mechanic will look at when assessing the condition of an older motor.... A very little bit is normal, a lot is very bad news in an engine with a lot of miles on it or one that has seen poor care.

Now you have not said how many miles are on this old girl, but if it is excessive, the blow by can hurt resale. A smart Buyer will be checking this under the bonnet (hood in America). If it is not excessive in miles, and has gotten regular oil changes, you might try changing the oil if it is due. Or, you might try changing the type of oil to a higher grade... Once in a while this can help the blow by a little, remote chance but what the heck...

Otherwise, you have a problem.... It is usually a sign of an engine that is using oil as well, worn rings... It this all adds up to fit your situation, then you will have to pick the lesser of evils, sell it for less would be my suggestion, or get a price to pull the heads and do an inframe light rebuild, but I doubt that is feasible on the 7.3s for $$$ reasons...

Good Luck, Ranger in Oz...
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