Posted by Bud Tierney on August 21, 2015 at 17:10:05 from (65.102.33.147):
In Reply to: Engine oil temperature posted by J. Schwiebert on August 20, 2015 at 18:14:03:
Well, had a couple manuals handy... Superior Diesel PTD 6cyl 81/2 x 101/2 240/720rpm--- Normal lube oil optg temp---125F Max lube oil optg temp---140-160F Water normal and max---140 and 165 (couldn't find any dates)... Wauk-Heselman Gen'l Inst's (1952 reprint?? "Edition 15")(No HP/RPMs--engines from 221-2894 CID) Has a section on selecting oil by oil temp and air temp; says two paramount criteria: oil temp in running engine and whether Class "A", "B" or "C" engine "...class determined by size, bearing clearances and RPMs, but no class specs listed... Goes on to show table of four optg temp ranges: 140-160, 160-180, 180-200, 200-220 with viscocity numbers (ranging from 10W-50W)for those temp ranges for all three "classes"... Says over 220 oil breaks down, should install oil cooler; under 140 sludges etc. Wauk 195DLC/DLCA Optg Manual (1961)(No HP/RPM) lists temp ranges:---Below 150, 150-180, 180-220 and 220-240, viscosity ranged from 10W-40W. Comments sludging below 160, problems above 230 may be alleviated by additives. No mention of any engine "classes". Sounds like newer engines, and oils, run hotter...... Heat dissipation, I would guess, would depend upon numerous individual variables...
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