Oil Temp vs. Water Temp

expressbus · June 06, 2009, 01:06:16 PM

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.

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

Van · June 06, 2009, 01:44:01 PM

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.

luvrbus · June 06, 2009, 02:28:07 PM

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

JackConrad · June 06, 2009, 02:49:56 PM

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

luvrbus · June 06, 2009, 03:16:16 PM

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

expressbus · June 06, 2009, 05:09:38 PM

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.

HB of CJ · June 06, 2009, 07:19:50 PM

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

luvrbus · 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.
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

Dreamscape · June 07, 2009, 04:05:56 AM

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

johns4104s · June 07, 2009, 05:03:11 AM

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

JackConrad · June 07, 2009, 05:25:46 AM

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

expressbus · 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.

Dreamscape · June 07, 2009, 08:58:32 AM

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

JohnEd · June 07, 2009, 12:12:03 PM

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

JackConrad · June 07, 2009, 12:35:02 PM

Is transmission fluid at proper level and does it smell burnt or look brown? Jack