1990 8V92T Oil and water temps have been consistantly very close to the same (i.e. water 185 - oil 185) in the 2 1/2 years we have owned the coach. 8) Since the last oil and filter change, done by a Florida Conversion Shop in January, the oil temp is now 10-15 degrees higher than the water temp (i.e. water 185 - oil 200-210). :( I am wondering why? Would it be the wrong oil was used, is something getting ready to let go in the engine itself? I am getting ready to depart on a month long journey and would really like to know if I have something that needs to be addressed in the near future or NOW. :-\
Thanks for any info that may be available or especially if you have encountered a similar condition.
Will
Will
This is gonna take a little detective work,we need the facts first,cause the oil change was performed for you .How many miles since the change ,the type of oil,did the new filter go in wet or dry,plus the temps are up a little I think in your area since January maybe?
Then there is the oil pump,others will have to jump in here ,to cover that area if there is something that can get buggered up in that neck of the woods .Also check oil temp gauge leads and terminals for corrosion,as well as the sending unit it's self,hows the oil pressure has that changed?
I think that if something was wrong ,coolant temps would rise also.Good luck.
Will, some oil filters will cause oil temps to rise when I use a Fram my 8v92 it will go up about 15 degrees. Check your filter and the oil cooler with a IR gun against your gauge good luck
Did you notice the difference immediately following the oil & filter change? If so, what was different at the change (different oil brand or weight, different filer brand or number)? Jack
Will, check the top of your oil filter base for a large nut on top you shouldn't have one on your year model of bus DD used what was called a Thermatic oil control valve but I think 1988 was the last year for it but you never know.
If you have that valve it may need servicing I never service the valve I just replace it with a standard base.
The only time to worry about the oil temperature is when it running over 230 degrees for long periods of time good luck
Thanks for the information. Here are a few further comments. As to the filter it was a NAPA filter - supposedly a interchangeable with the DD #. The oil was the same straight 40 weight I have been using as had the previous owner. I picked up a case lot while in Naples Fl last January. The engine does not use oil for which I am glad. I just like having some on board so I don't have to go hunting since most of the truck stops I've been at only seem to carry the multi-viscosity grades. As for the top of the oil filter bracket having a temp device - I don't know that answer. The bus is in front of the house so I'll check it tomorrow morning.
I'm assuming the temp sender is an electrical one but I'll have to do some more research on that and will also look for any corrosion. My engine bay is not clean enough to eat off the surface but I do try to keep it clean after every trip using an organic/orange based degreaser.
The water temps have been consistent since I bought the coach. That was what peaked my interest when I saw the oil temps going higher. Yes there was a correlation with the temp differentials and the oil change. I should have listened to the shop manager at Holiday Tours and not changed the oil. I am still adjusting to some of the higher mileage intervals on maintenance items such as the distance between oil changes. I had about 12,000 on the old change and was told not to worry about it for another 12,000. I felt better changing it and now the temps are different. I've also never had an oil temperature gauge before.
Thanks again for the info. I'm open to any more suggestions that may be out there.
No disrespect intended or implied....or just ignore that man behind the curtain. Did they put in enough oil? How much did the filture(s) (NAPA) cost in comparsion to the DD filtures? Also, could they have put in too much? HB of CJ
Will, most buses don't have a engine oil temp gauge, so I am going to ask this question with no disrespect to you are you sure that the gauge is not for the transmission.
As far as Napa filters they are good filters it is the only ones I buy.
They cost a little more than most but I never had a problem with my 8v92 with Napa 1970 oil filters made by Wix good luck
If all else fails you might remove the newer installed filter and reinstall the same brand/number that was taken off. Maybe the new filter is restricting the flow, dunno. You might give a shot, hope you fix your issue so you can enjoy your trip ! ;)
Paul
Will,
Have you seen any drop in oil pressure? I have see higher temperatures mean lower pressures on my 4104/671 DD. As the temp increases the oil thins and the pressure drops.
John
Quote from: luvrbus on June 06, 2009, 08:33:43 PM
Will, most buses don't have a engine oil temp gauge, so I am going to ask this question with no disrespect to you are you sure that the gauge is not for the transmission.
See what happens when I ASSUME? We have an engine oil temperature gauge on our bus, so I ASSUMED that he does also. Perhaps LUVR is right. Also, no disrespect intended Jack
My Bad! I checked the convertor's manual this morning. The guage in question is actually a TRANS oil temp gauge. Manual says it should not exceed 250 degrees. We are a long way from there but will have the trans serviced within the next month.
I appreciate all the insightful replys to my dumb question. Now I know where to look - at the hardest point to get at without a pit or a lift.
Thanks and I apologize for any inconvenience.
Will G.
Quote from: expressbus on June 07, 2009, 08:52:15 AM
My Bad! I checked the convertor's manual this morning. The guage in question is actually a TRANS oil temp gauge. Manual says it should not exceed 250 degrees. We are a long way from there but will have the trans serviced within the next month.
I appreciate all the insightful replys to my dumb question. Now I know where to look - at the hardest point to get at without a pit or a lift.
Thanks and I apologize for any inconvenience.
Will G.
No question is dumb.........Period! And another thing, no need to apologize, there is no inconvenience........! That's why we are all here, to learn and share information! And of course our opinions, and you know how that is! ::)
Paul
Will,
ANY gauge that jumps 20 degrees needs to be investigated. OK, so engine oil has been eliminated. You are still in the HUNT. Good luck with this and please share the final findings.
Thanks,
John
Is transmission fluid at proper level and does it smell burnt or look brown? Jack
You have to check the tranny level with the coach running
John
Quote from: johns4104s on June 07, 2009, 04:30:09 PM
You have to check the tranny level with the coach running
John
My transmission dipstick for an Allison 740 has a cold mark. Does that mean cold as in not running or cold as in running but not on the road yet.
Mike
Quote from: loosenut on June 07, 2009, 08:34:17 PM
My transmission dipstick for an Allison 740 has a cold mark. Does that mean cold as in not running or cold as in running but not on the road yet.
Mike
Cold as in running but not on the road yet. After starting the engine, I always place the shift lever in each gear position and then into nuetral before checking tjhe fluid level to be sure all servos, etc. are full of fluid. Jack
Thanks. There is so much I don't know. I had a good chuckle this weekend. I carry full compliment of spare fluids but I don't know how or where to check or add fluids.
So I did what every insane newbie does and spent a couple of hours on the world wide waste of time trying to find a picture of the various dipsticks and filler tubes but came up dry. I then spent an hour with a headlamp and mirror following the various pipes etc.
After the internet search and the physical search I followed with a few hours of quiet contemplation with my favorite beverage. This lead to one AHA!, the transmission dipstick. It is atf red. Haven't figured out where to add yet but first things first.
Mike
Usually fills where its checked as in the dipstick tube! Mine does anyway by using a trans funnel!
Ace
Wow,
Looks like I sparked some serious discussions on checking fluids and where to check them.
Jack, the fluid does not have a burnt smell. It is also pink as a baby's well you know! My stick also has a cold Hot mark for checking the fluids. I'll probably have to go about ten miles form home before finding that nice flat spot off the road to pull a check on the real level. The road in front of my house is sloped severely from many resurfacings since 1921 when the neighborhood was built.
We are off tomorrow for Long Island NY, stopping to overnight in Carlisle PA. We are really looking forward to this extended vacation.
Thanks for all the helpful suggestions and comments.
Will G.
Engine oil and trans fluids normally run hotter than engine coolant.
Some trans and engine oil coolers run through the radiator, usually the bottom.
If the radiator coolant wasn't cooler than the oil/fluid it wouldn't cool very well.
Ace,
I will soon be changing my trany oil to Hydrotech and see you mentioned a tranny funnel, When I topped the tranny up the last time(after a hose had broke) I had quite a time and it was awful slow going. Is the tranny funnel anything special if so were would I get one.
Thanks
John
John,
Here is a photo of my transmission funnel. Nothing special except the long narrow tube part of the funnel to fit inside the dipstick tube. You are correct, you will not do a NASCAR pit stop speed fill of the transmission. Jack
Thanks Jack,
John