High engine oil temps
Thread Starter
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Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
High engine oil temps
I have been trying to track down why my engine oil temps run so hot. Thought I'd throw it out for opinions and I need to get this corrected soon.
Here is the issue:
Running unloaded at 70mph, EOT's are 240* at about 1700 RPM. I verified it with my scanner AND also used a Laser temp gun to make sure my EOT sensor wasn't bad. Both the scanner and laser where within a few degrees of each other. I also shot the oil cooler which was 237* and shot the bottom of the oil pan which was 210*.
My coolant temps shooting the upper radiator hose was 184* and the lower hose was 147*.
From everyone I have talked with, the coolant temps and EOT's should be very close to each other. Mine are not.
Last year, I saw EOT's of about 195-205* with the same setup.
any thoughts or suggestions to pass along?
Greg
Here is the issue:
Running unloaded at 70mph, EOT's are 240* at about 1700 RPM. I verified it with my scanner AND also used a Laser temp gun to make sure my EOT sensor wasn't bad. Both the scanner and laser where within a few degrees of each other. I also shot the oil cooler which was 237* and shot the bottom of the oil pan which was 210*.
My coolant temps shooting the upper radiator hose was 184* and the lower hose was 147*.
From everyone I have talked with, the coolant temps and EOT's should be very close to each other. Mine are not.
Last year, I saw EOT's of about 195-205* with the same setup.
any thoughts or suggestions to pass along?
Greg
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Sounds to me like an obstruction in the oil cooler. You didnt do any hardblok by chance did you? The extra shearing of the dual Hpops arent helping matters any either. If i were you, i would buy a new oil cooler core, 4 o-rings two gaskets, make a day project out of it. Even running my truck 2300*+ the EOT only got up to 230ish and it started making some funkkkyyy noises.
Thread Starter
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Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
Sounds to me like an obstruction in the oil cooler. You didnt do any hardblok by chance did you? The extra shearing of the dual Hpops arent helping matters any either. If i were you, i would buy a new oil cooler core, 4 o-rings two gaskets, make a day project out of it. Even running my truck 2300*+ the EOT only got up to 230ish and it started making some funkkkyyy noises.
I was also wondering if maybe I have a thermostat stuck closed or partially closed.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Is your block partially filled?
If you're concerned with the thermostat, take it out and drop it in a pan of water. Throw it on the stove and bring it up to a boil. You'll be able to watch and see if it's working then.
If you're concerned with the thermostat, take it out and drop it in a pan of water. Throw it on the stove and bring it up to a boil. You'll be able to watch and see if it's working then.
Thread Starter
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Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
No the block isn't filled.
I'll probably have to try your suggestion and pull the t-stat.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
I have been trying to track down why my engine oil temps run so hot. Thought I'd throw it out for opinions and I need to get this corrected soon.
Here is the issue:
Running unloaded at 70mph, EOT's are 240* at about 1700 RPM. I verified it with my scanner AND also used a Laser temp gun to make sure my EOT sensor wasn't bad. Both the scanner and laser where within a few degrees of each other. I also shot the oil cooler which was 237* and shot the bottom of the oil pan which was 210*.
My coolant temps shooting the upper radiator hose was 184* and the lower hose was 147*.
From everyone I have talked with, the coolant temps and EOT's should be very close to each other. Mine are not.
Last year, I saw EOT's of about 195-205* with the same setup.
any thoughts or suggestions to pass along?
Greg
Here is the issue:
Running unloaded at 70mph, EOT's are 240* at about 1700 RPM. I verified it with my scanner AND also used a Laser temp gun to make sure my EOT sensor wasn't bad. Both the scanner and laser where within a few degrees of each other. I also shot the oil cooler which was 237* and shot the bottom of the oil pan which was 210*.
My coolant temps shooting the upper radiator hose was 184* and the lower hose was 147*.
From everyone I have talked with, the coolant temps and EOT's should be very close to each other. Mine are not.
Last year, I saw EOT's of about 195-205* with the same setup.
any thoughts or suggestions to pass along?
Greg
I know you've replaced it with that 500HP beast you now have, just don't know when.
.
I've put a thermostat in a pot of boiling water to test it function and it opened.
But the engine was still overheating and a new t-stat fixed it. It just wasn't opening fast enough..
.
I guess I'm saying, to replace the thermostat and take it from there.
But the water temperature should be too high as well so the numbers aren't adding up for me on this, Greg.
I'll be interested in hearing the outcome of a new t-stat.
.
I've had EOT up to 245 before on a gasser GTI, climbing the Coquihalla Pass in August one time, but the coolant guage stayed the same.
That car would run 220 in the dead of winter on the freeway and that's the way that all of them behave.
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Thread Starter
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Elder User
Joined: May 2008
Posts: 860
Likes: 2
From: Liberty Lake, WA
Is this the same engine too?
I know you've replaced it with that 500HP beast you now have, just don't know when.
.
I've put a thermostat in a pot of boiling water to test it function and it opened.
But the engine was still overheating and a new t-stat fixed it. It just wasn't opening fast enough..
.
I guess I'm saying, to replace the thermostat and take it from there.
But the water temperature should be too high as well so the numbers aren't adding up for me on this, Greg.
I'll be interested in hearing the outcome of a new t-stat.
.
I've had EOT up to 245 before on a gasser GTI, climbing the Coquihalla Pass in August one time, but the coolant guage stayed the same.
That car would run 220 in the dead of winter on the freeway and that's the way that all of them behave.
I know you've replaced it with that 500HP beast you now have, just don't know when.
.
I've put a thermostat in a pot of boiling water to test it function and it opened.
But the engine was still overheating and a new t-stat fixed it. It just wasn't opening fast enough..
.
I guess I'm saying, to replace the thermostat and take it from there.
But the water temperature should be too high as well so the numbers aren't adding up for me on this, Greg.
I'll be interested in hearing the outcome of a new t-stat.
.
I've had EOT up to 245 before on a gasser GTI, climbing the Coquihalla Pass in August one time, but the coolant guage stayed the same.
That car would run 220 in the dead of winter on the freeway and that's the way that all of them behave.
I just went out again and drove the truck. The HPOP resivour cover was 224*, I shot a freeze plug on the pass side of the block which read 180*. The upper radiator hose was firm and not squishy. I shot the billet housing where the T-stat resides and it was 200*
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
The short stem can't open enough to provide proper flow, so you need to change it to a long one. 180 at the freeze plug doesn't sound like you're overheating your engine though. Let us know what difference you see with the long thermostat.
Cargo Master
Joined: Mar 2008
Posts: 2,975
Likes: 19
From: Archdale,N.C.
Phil