Checking oil
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09-23-2008, 08:20
Post: #1
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Checking oil
Quick question: When checking oil levels, does it matter whether the
oil is hot or cold? What difference, if any, should I expect to see? -Ryan '86 PT-40 8V92 |
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09-23-2008, 09:04
Post: #2
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Checking oil
Hot/cold matters with hydraulic fluid, but not so much with engine oil. What
does matter with the latter is that there has been time for oil to drain back to the pan after the engine is shut off. A few minutes is probably enough to take care of most of it. For tranny fluid just the opposite is correct - the engine should be running. Hot check is best, but the typical dipstick will show hot/cold marks. Don Bradner 90 PT40 "Blue Thunder" Posting today by satellite from Williamsburg, VA My location: http://www.bbirdmaps.com/user2.cfm?user=1 On 9/23/2008 at 1:20 PM Ryan Wright wrote: >Quick question: When checking oil levels, does it matter whether the >oil is hot or cold? What difference, if any, should I expect to see? > >-Ryan >'86 PT-40 8V92 > >------------------------------------ > >Yahoo! Groups Links > > > |
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09-23-2008, 09:24
Post: #3
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Checking oil
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09-23-2008, 10:17
Post: #4
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Checking oil
Ryan,
I discovered the hard way that the coach does need to be reasonably level when checking the oil, inclines can give surprisingly false levels on the dipstick. Scott Forman 86 PT38 Memphis --- In WanderlodgeForum@yahoogroups.com, "Ryan Wright" > > Quick question: When checking oil levels, does it matter whether the > oil is hot or cold? What difference, if any, should I expect to see? > > -Ryan > '86 PT-40 8V92 > |
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09-23-2008, 11:24
Post: #5
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Checking oil
The owners manual for my S-60 says "wait 15 minutes" for the oil to
settle in the pan. I haven't been able to note any significant difference in the oil level due to heat (although hot oil, no doubt, will have a slightly larger volume). I suspect that a wait period (to let the oil drain down into the pan) is appropriate for the 8v92 as well. There might not be any significant difference due to heat. Note that automatic transmissions are different and often have hot vs. cold 'full' marks on their dip sticks -- or some must be 'hot' when checked. Pete Masterson '95 Blue Bird Wanderlodge WBDA 42 aeonix1@... On the road near Scranton, PA On Sep 23, 2008, at 4:20 PM, Ryan Wright wrote: > Quick question: When checking oil levels, does it matter whether the > oil is hot or cold? What difference, if any, should I expect to see? > > -Ryan > '86 PT-40 8V92 > |
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09-24-2008, 13:06
Post: #6
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Checking oil
Thanks for the tips, gentlemen. I didn't think it mattered, as it
never has on any car I've ever owned, but I wanted to check to be sure. Scott, I'll be sure to check that the coach is level, too - that's a good tip and something I wouldn't have thought of otherwise. -Ryan '86 PT-40 8V92 |
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09-24-2008, 14:03
Post: #7
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Checking oil
Last year, I took a trip to New Orleans. Checked the oil before I left
home...my parking pad makes the bus high at the rear. When I got to New Orleans, checked again, and the oil level appeared to have risen when it should have used some. Called my mechanic, he diagnosed it as leaking fuel crossover tubes, which is apparently fairly common on the 8v92. This would mean that diesel was leaking down into the crankcase, which is bad for the lubricity of the oil. The ultimate bad outcome could be a spun bearing or other lubrication-related problem. The suggestion was to get an oil change before leaving to drive home and checking the oil every 100 miles to make sure the level wasn't rising too quickly. I did as instructed. Took the bus in after getting home. The drained oil again and analyzed it for diesel, found none. Pulled valve covers and checked crossover tubes, looked fine. They were puzzled. Then, by dumb luck, they happened to check the oil at two different places on their lot and discovered how the angle of the coach can make a significant difference. If the rear is high, oil will register lower than it really is. If the rear is low, it will register high. By filling by bus to the full mark when parked on my rear-high parking pad, I was actually overfilling the crank (which leads to extra slobber and a mess on the back of the bus). Scott Forman 86 PT38 Memphis --- In WanderlodgeForum@yahoogroups.com, "Ryan Wright" > > Thanks for the tips, gentlemen. I didn't think it mattered, as it > never has on any car I've ever owned, but I wanted to check to be > sure. > > Scott, I'll be sure to check that the coach is level, too - that's a > good tip and something I wouldn't have thought of otherwise. > > -Ryan > '86 PT-40 8V92 > |
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09-26-2008, 05:26
Post: #8
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Checking oil
Really appreciate your sharing this, Scott. Sounds like you found out
the expensive way. I hate taking the coach to a shop; it's a minimum of a thousand bucks every time, so I'll definitely remember this tip. -Ryan '86 PT-40 8V92 On Wed, Sep 24, 2008 at 7:03 PM, Scott Forman <scottforman75@...> wrote: > If the rear is high, oil will register lower than it really is. If the > rear is low, it will register high. By filling by bus to the full mark > when parked on my rear-high parking pad, I was actually overfilling the > crank (which leads to extra slobber and a mess on the back of the bus). |
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