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Old 05-02-2010, 01:28 PM   #1 (permalink)
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Unhappy 5.9 cummins oil leak

I have a 1996 dodge ram with a CumminsTurbo. Since the last oil change I have a leak from the injector pump and another behind the fan by the crank plate. Could this problem originate from over filling at oil change? (blowing seals etc.)Will this truck engine handle overfill without blowing seals?
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Old 05-02-2010, 01:38 PM   #2 (permalink)
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You do not want to overfill the crankcase, it causes all kinds of problems, none of them helpful to the life, and economical operation, of your engine. Drain the oil level down use a clean drain pan, you can use that oil again in the next change. Then wash it, run it while you use a soapy mix to clean the belt. Spray directly threw the rad to clean it. then check to see if the gear housing is cracked, directly above the crankshaft pulley. Just a thought!
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Old 05-02-2010, 01:44 PM   #3 (permalink)
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I HIGHLY doubt that the leaks are due to overfilling it, unless its got an extra 5gal in there!

Their are many places for a leak to form at the front of the engine, so your going to have to narrow it down. It could be coming from between the gearcase and block, the geracase cover or the front crank seal.

As for a leak at the inj pump, not too many places for a leak there, just the oil feed line (between the pump and engine) and the o-ring that seals the pump to the case. It 'could' be leaking from the gov housing gasket or one of the plugs on the pump, but thats not very likely.

Leaks from the vac pump arent uncommon...
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Old 06-13-2011, 08:51 AM   #4 (permalink)
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Question isb 5.9 cummins bad oil leak front engine

Hi there I have 5.9 244 valves cummins on a freightliner fc-70 since i bought it, it was leaking front the front of the engine, I have it checked and the mechanic said that the main fron seal needed to be replaced, so, he did it repleced it, but then when I went to pick the truck, i drove about 20 miles and I checked again, it was the same mess of oil in the fron of the motor, the question is , it could be oil overfilled? how many quartes of oil this engine need, I askes to the guy from the local freightlines store and he said 24 quarters but Idont know thanks .
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