A couple ??
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Senior User
Joined: Feb 2006
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A couple ??
1. When is the right time to check the oil in my 91 7.3 - cold or at operating temp? Sorry, I don't have the owners manual.
2. I opened the radiator cap this morning and it was still pressurized. The truck had not been run in 24+ hours. What could cause that? could it be a blocked heater core because I think mine is blocked.
Thanks in advance.
2. I opened the radiator cap this morning and it was still pressurized. The truck had not been run in 24+ hours. What could cause that? could it be a blocked heater core because I think mine is blocked.
Thanks in advance.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Warm oil is the correct time to check it, give it a couple minutes drain time after you shut it off.
Was there pressure or a vacuum in the cooling system when you checked the radiator?
I have noticed a vacuum when I have checked mine several times.
Was there pressure or a vacuum in the cooling system when you checked the radiator?
I have noticed a vacuum when I have checked mine several times.
Postmaster
Joined: Jun 2007
Posts: 2,621
Likes: 1
From: Sweetwater Texas
Pressure could be caused from the fact that the last it was opened it could have been cold outside, and so now this time when you opened it, it is now warmer outside, thus pressure is built because I bet your overflow outlet is clogged.
Posting Guru
Joined: Sep 2007
Posts: 2,207
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From: Las vegas
I wounder how may people actauly checked the oil like that in the u-hauls with 7.3s and 6.9s that say to check the oil every time you stop for gass.
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Postmaster
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From: Sweet Home, OR
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Senior User
Joined: Feb 2009
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From: Ortonville, MN
i should check mine everyday but i find bout once a week will suffice as long as is not leaking. i only have to add bout half a gallon oh every two to three weeks or so, depends how hard i run it.
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
I was called out one time on a u-hual that was smoking bad and no power.
It turned out the guy had been adding oil every stop trying to keep it full like they told him and he had it full literaly.
It turned out the guy had been adding oil every stop trying to keep it full like they told him and he had it full literaly.
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