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Without major blow by or oil consumption I would say look at the fuel system. What RPM is the engine running. Back 40 years ago I put a kit in one really did nothing. Had old guy check it out it was not running up to 1600 so we speeded it up, over shot the mark and ran it about 1700 high idle. Made a different tractor out of it.
At first Cat had them at 1400, but turned them up to 1600 latter on. The 318 engine in the DW 10 scraper was turned up over 2000 if I am not confused again. They did have a different governor and other parts on the engine made for the scrapers. But proves the bottom end can stand more RPM than the setting used in the D6.
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Suggest that if you have not yet done so to adjust the valve lash and get the injection pump lifter settings checked.
I know of overhauled engines that ran no better after overhaul than before due to incorrect lifter settings.
Cheers,
Eddie B.
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Antique Caterpillar Machinery Owners Club
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