Re: more low ash oil discussion

Posted by Aces on March 02, 2006 at 10:04:12 from (65.54.98.160):

In Reply to: more low ash oil discussion posted by railhead on March 01, 2006 at 19:28:32:

The ash was additives in the oil as detergents to keep the engine cleen. I was a mechanic in the 60's and 70's when IH came out with the low ash # one engine oil. I don't know why IH had the problem they had with the 263 291 gas engines that they had, but it was bad in the 656 706 806 gas engines. Carbon bulid up was bad, burning valves and causeing plugs to fail. I did not see it in the 460 and 560 near as bad as the 656 706 806. The 3 newer tractors would burn big chunks out of the valves and carbon would be hard and lots of it in the top of the cylinder.
IH said it was the oil and the ash in the oil, the oil people said no. Where I worked at the time we had a 806 that would only run about 100 hrs on a set of plugs, so we put some LP oil in it and the problem was much better. After IH came with the Low ash oil we had no more problem with the gas engines. Had a new 656 with about 100 hrs and it would not do the work of the 504 the guy had. Pulled the head off cleaned the carbon out of the head cleaned the valves gave the valves a little grind to reseat, new plugs and IH oil, put it on the dyno got about 66 HP, run like a champ. IH # one oil is all I ever but in a new overhaul. There were three metals in the oil one was magnesium, don't remember the other two. They way the low ash oil stoped the problem I sure am a believer.

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