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07-31-2016, 04:46 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Oil Temp IO360 RV-7A
After building 4 RVs last week I purchased number 5. I am starting to think I have an oil temp problem. Yesterday I flew the aircraft, OAT was around 90f, climbed out to 4500 feet and OAT was 82f. Cylinder temps were around 350-360f. Here is what is bothering me, oil temp peaked at 155f. The seller had taped up about 25% of the oil cooler and stated he did that to help raise the oil temps. Also around every adel clamp on the engine mount I see what looks like a little brown stain, at first that did not bother me but I am know wondering if it is heat related.
Here in North Texas I would have expected 200f on climb settling back to 180 in cruise. Any thoughts would be appreciated.
__________________
Built, RV 8, RV8A, RV 10, RV12, Purchased RV7A
Restored J3Cub and PA28R180
Pecan Plantation
Eagles Nest Mentor
EAA Tech Counselor
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07-31-2016, 05:05 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Pat, I am assuming it has the standard Vans oil cooler (Niagara 20002a) mounted on the baffle? And with your experience, you have already checked the temp sensor to see it reading ambient before start up?
Just thinking out loud - lets assume the engine timing is not retarded and its performance is nominal - - and if the cooler is standard Niagara 7 row, and the vernatherm is stuck closed, then the oil temp behavior would act the same as the temperature rose after TO up to the peak on climb but then would drop lower than 180F when leveling off in cruise.
If cooler is way larger than the 7 row standard, AND the VT is stuck closed, then it might not reach the same peak and would stay low and go lower on cruise.
Hmmm, curious indeed.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 07-31-2016 at 05:22 AM.
Reason: Added rationalizing
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07-31-2016, 05:28 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Yes, standard Niagra from Vans mounted on rear baffle. I did not look at the ambient however after reading your message I went back and looked at a screenshot of the Skyview taken some time in the past with a cold engine. Oil temp was 65f and OAT read 72f.
__________________
Built, RV 8, RV8A, RV 10, RV12, Purchased RV7A
Restored J3Cub and PA28R180
Pecan Plantation
Eagles Nest Mentor
EAA Tech Counselor
Last edited by Pat Stewart : 08-01-2016 at 10:41 AM.
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07-31-2016, 05:58 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by Pat Stewart
<snip>
Here in North Texas I would have expected 200f on climb settling back to 180 in cruise. Any thoughts would be appreciated.
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I agree with your assessment. I'd check your temperature gauge/sender.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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07-31-2016, 06:00 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Pat Stewart
...OAT was around 90f, climbed out to 4500 feet and OAT was 82f. Cylinder temps were around 350-360f. Here is what is bothering me, oil temp peaked at 155f.
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Check the location of the temperature probe. My guess is that you'll find it installed in the viscosity valve hole. There is no actual flow there.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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07-31-2016, 06:20 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Thanks guys, Dan you wouldn't happen to have a picture/diagram would you.
Thanks
__________________
Built, RV 8, RV8A, RV 10, RV12, Purchased RV7A
Restored J3Cub and PA28R180
Pecan Plantation
Eagles Nest Mentor
EAA Tech Counselor
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07-31-2016, 07:11 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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Look at the bottom pic, it is the red plug just above the oil filter.
http://www.mykitlog.com/users/displa...g=56259&row=17
Nice to hear from you. Hope all is well in Granbury.
__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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07-31-2016, 08:17 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Pat Stewart
Thanks guys, Dan you wouldn't happen to have a picture/diagram would you.
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Sure. This is a standard AC-style oil filter adapter on the back of a standard accessory case. The oil temperature sender is in the WRONG place.

__________________
Dan Horton
RV-8 SS
Barrett IO-390
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07-31-2016, 08:56 AM
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Join Date: Dec 2010
Location: Hilton Head Island
Posts: 1,089
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I've had the same issue as Pat discribed. I also taped up a coule inches of the cooler and found pretty good response. Cruise at about 175 degrees and climb 180-200 - All in Florida summer.
But, when I look at Dan's pic I think my pressure sender is mounted in that hipe he points to.
I'll have to take a closer look amd report back.
Curious on your outcome Pat.
__________________
John Mastro
RV-8
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07-31-2016, 09:31 AM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Thge brown stain around black adels is normal. It's what they do. Even sitting around without running.
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Actual repeat offender.
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