oil leak

[willysutton1]

theres a new wet spot under the engine near the front, im hoping its not the front pan gasket. another possible points to look at ?

 

[bcbender]

Front crankshaft seal perhaps, I changed mine when it started to leak alittle, but mine ran down the pan and dripped towards the back.

 

[SSovaiko]

I had a completely wet front crankcase, sides, and pan - replaced the front crank seal and sleeve (someone had installed the wrong seal, backwards, inside out (?!)). Fixing that with an OEM seal and sleeve helped a lot, but still have a oil flowing down the back of the timing case apparently from the camshaft sensor....almost as if it were an oil line under pressure. Time to replace, then keep working my way from front to back.

 

[Darkbloodmon]

The timing case itself, When I took the front side of my engine apart for a variety of installations I disassembled everything around the perimeter of the case and went around it with a good bead of Toyota FIPG 103. It's a really high-quality sealer; safe for oils, fuel and coolant.

I really don't want to have to pull my cam for the case gasket. Not that it was leaking, but its the only gasket I haven't replaced along side the head.

I'm considering a venturi CCV system as my mileage goes up to lessen the risk of gaskets/seals blowing out from blow by increasing.

 

[PLohr]

“I'm considering a venturi CCV system as my mileage goes up to lessen the risk of gaskets/seals blowing out from blow by increasing.“

Is there a specification for acceptable crankcase pressure or volume?

A while back I changed the front crank seal, timing cover gasket, rear main seal and oil pan gasket. The rear main seal started leaking again within two years. Frustrating. This leak began when the truck saw its first winter (we had moved from FL to TN). Today, the only gaskets which aren’t leaking are the two related to the valve cover. This is why I’m interested in learning about crankcase pressure. Maybe that’s a reason behind the leaks?

Thanks for any help.

 

[Darkbloodmon]

“I'm considering a venturi CCV system as my mileage goes up to lessen the risk of gaskets/seals blowing out from blow by increasing.“

Is there a specification for acceptable crankcase pressure or volume?

A while back I changed the front crank seal, timing cover gasket, rear main seal and oil pan gasket. The rear main seal started leaking again within two years. Frustrating. This leak began when the truck saw its first winter (we had moved from FL to TN). Today, the only gaskets which aren’t leaking are the two related to the valve cover. This is why I’m interested in learning about crankcase pressure. Maybe that’s a reason behind the leaks?

Thanks for any help.

On class 8 rigs they often have a specification as a determination for a rebuild/refresh. I did a quick key word search in my 03 FSM PDF nothing came up. I doubt there would be one for a light duty road engine ISB 5.9. They may have spec for generators or other applications (logging, plane tugs, marine engines, busses, etc.)

Cold weather seal contractions can be a bother on high mileage vehicles, especially with that most recent "cold snap" (for the south east at least). The work around being an insulated garage or use of a block heater in anticipation of cold weather.

If your CCV filter hasn't been changed in a while it'd be a good place to start; there's a lot of aftermarket valve covers with different breather systems that essentially vent a higher volume of CCP some of them get pricey though as "show pieces".

I'm still looking to piece together a venturi setup on my 03, just hit 250K the day before new years eve. Haven't gotten around to it yet with everything else going on.