Where the are my vacuum lines
#1
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Where the are my vacuum lines
Hey Y'all I have oil coming up my dipstick and feel like it might be from a vacuum leak causing to much crankcase pressure. I've been trying to trace my vacuum lines to check for leaks but all I can seem to find is the line coming from the vacuum pump to the check valve at the brake booster but both ports on the check valve are capped off, do the vacuum lines continue through the firewall on the other side of the brake booster?
I've looked at the vacuum diagram for these trucks but it doesn't seem to help.
Thanks
I've looked at the vacuum diagram for these trucks but it doesn't seem to help.
Thanks
Last edited by BC847; 05-01-2020 at 12:34 PM. Reason: Removed profanity from title.
#3
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The vacuum pump on both Non-IC and IC trucks does not use and crankcase air to generate it's vacuum. The oil coming up your dipstick is caused by too much blow by in the motor, or a plugged crank case breather tube.
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Edwin, it's a 93.
I've checked my crankcase breather tube, its fine.
From my understanding if there's a vacuum leak somewhere the vacuum pump vents into the crankcase. Is this incorrect? Though now that I'm thinking about it the only hose coming off the pump goes to a check valve...
I've checked my crankcase breather tube, its fine.
From my understanding if there's a vacuum leak somewhere the vacuum pump vents into the crankcase. Is this incorrect? Though now that I'm thinking about it the only hose coming off the pump goes to a check valve...
#5
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I don't think it's a vacuum issue. Diesel filling the crankcase, Head gasket, or a blown cylinder would be my guesses.
Maybe drain it and see what comes out? If you've got over 3 gallons, its not all oil.
Maybe drain it and see what comes out? If you've got over 3 gallons, its not all oil.
#6
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Sam,
Does the oil level on the dip stick return to normal after it sits for a while, or continues to rise higher after running it?
Does the engine run normal or rough?
White smoke, blue smoke from the exhaust?
Does the oil level on the dip stick return to normal after it sits for a while, or continues to rise higher after running it?
Does the engine run normal or rough?
White smoke, blue smoke from the exhaust?
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Thanks,
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#8
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Is there any diesel fuel in the oil? Maybe the lift pump or front seal of ip is leaking fuel...Mark
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edwinsmith (05-08-2020)
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