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Ford 9N, 2N & 8N Discussion Board |
motor oil; detergent v non-detergent
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Posted by Rob on May 25, 2005 at 06:30:05 from (63.245.133.124):
So you want the clean engine that modern detergent oil promises? Maybe not a good idea.
Using detergent oil in the N engine cause excessive wear of bearings and seals because it allows abrasive material to circulate and recirculate through the engine.
Early engines used straight engine oil (non-detergent; "ND") and material settled out of the oil to accumulate as sludge in the pan and passages. The sludge was manually removed when the engine was rebuilt. The N uses ND oil, filters only the oil to the governor, and the sludge is manually removed during rebuild.
Later engines were built to last so long between rebuilds that the sludge built-up to restrict oil flow. That problem was solved by adding detergents to the oil. Detergents (surfactants) keep the material in suspension so it can not settle out and accumulate to block passages. The material will then circulate and recirculate along with the oil over the bearings and against the seals.
That is a problem because the material is abrasive and causes unwelcome, excessive wear to the bearings and seals. That problem is solved by using a 100%, full-flow oil filter to remove the abrasive material before it circulates through the bearings and up against the seals. Using detergent oil requires the use of a 100%, full-flow oil filter to prevent excessive wear of bearings and seals.
The N does not have a 100%, full-flow oil filter so material suspended in detergent motor oil circulates and recirculates causing excessive wear of the bearings and seals.
If you want to use detergent oil you should change the oil very often to remove the suspended abrasives.
I think I"ll stay with ND oil and clean the sludge when I rebuild.
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