However you wish to refer to the Ford 460, either as a Ford LSG875 orsimply as a 385 Series Ford, it was Ford’s largest V8 until it wasreplaced in 2000 by the Model WSG1068 6.8L V10 engine.
TheFord 460 industrial engine was used in a variety of applicationsincluding wood chippers and tub grinders, co-generation systems,irrigation pump units, forklifts, etc. With all accessories installed,the Ford 460 engine at 2,800 rpm is rated at 148 hp on natural gas, 161hp when running on propane, and 173 hp when powered by pump gas. Thesepower ratings are revealing: the Ford 460 is a very much anunderstressed and relatively low revving power plant. Not only do itspower ratings communicate how understressed it is, the 460′s fullydressed out weight of 713 lbs. further indicates that the Ford LSG875will give many years of faithful service.
Oneweakness of these Ford 460 industrial engines, however, is that theytend to spin cam bearings. This can be caused by inadequatelubrication, a bent camshaft, or poor bearing clearances. Confoundingthis problem is that unlike most engines the camshaft journals are allthe same size from front to back. Usually, cam bearings get smaller youmove away from the front of the engine where the camshaft loads are thegreatest. The Ford 460 LSG875 engine cam bearings have the same 2.250?OD in all five cam bearing postions. This also may be a cause of thespun bearing problem.
Normally, when an engine spins a cambearing, a skilled machine shop will simply clean up the damaged cambearing housing bore using a line boring machine. Then a larger OD cambearing is used. Usually the parts people simple order up one with thesame part number as one from a position closer to the front of theengine. Unfortunately, the Ford 460 industrial engine uses the same cambearing in all five housing bores and because the aftermarket suppliesFord 460 cam repair bearings in only a 0.0005? oversize. As a result,the Ford 460 industrial owner’s options are often limted to buying aused Ford 460 industrial engine block because new Ford 460′s are nolonger available.
Buthere is a solution to this problem. The Ford FE big block engine is a close cousin to the LSG875.The FE engine has the same 2.124? ID cam journals but unlike the Ford460 has progressively larger housing bores as you move from front toback.
Specifically, the FE engine range from 2.265? to 2.310?in the OD of their cam bearings. In rebuiding your 460 Ford you couldjust pick the one oversize cam bearing that you needed to repair adamaged bore and use the standard Ford 460 cam bearings for the othercam journals. Or, a better idea, one that we use for severe duty Ford460 industrials is to line bore all the housing bores out to a new,larger oversize and use the same FE cam bearing in all locations.Please remember to line up the oil feed holes on the cam bores with theslots in the cam bearings before you drive in the bearings.
Finally, it is strongly recommended that you use a synthetic oil such as Mobil1 for all Fordindustrial engines with an oversize, remote mounted filter.
Tech Tip courtesty of Foley Engines
Engine Builder Staff
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