I have a 6NZ Cat in a 95 Freightliner FLD120 with a bad oil leak. Seems to have gotten worse over the past couple weeks. Problem is that I can't figure out where it is coming from. It is on the driver's side, behind the air compressor. Doesn't seem to be the front cover, although I know these motors are known for that. Air compressor has been replaced. Oil feed line was not, but doesn't look to be from there. Seems to be worse when loaded or under a hard pull. No blow by and no smoke out the exhaust. I'm wondering if it could be coming out of the head gasket? No oil in the antifreeze, or antifreeze in the oil. Getting ready to send it to somebody, but checking if anyone else has seen anything like this. Will try to get some pictures.
Cat 6NZ oil leak
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W Bench Farms, Jan 21, 2022.
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Pics or it's not real...
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I'd wash it then take it for a spin and see where that BP spill is originating from.
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Yep spray it down with some good cleaner let it idle and start looking for oil coming out somewhere.
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Still haven't pinpointed this oil leak, but what would be the chances of it leaking from between the head and block? Seems to be worse when loaded or heavy. Had a week of light loads and hardly any leak. Last week was 75k+ and went through a good bit.
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Spacer plate gaskets seem to leak worse when engine is working harder
Goodysnap Thanks this. -
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