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Where Measure Engine Temp. with IR #4679693
02/27/18 01:23 PM
02/27/18 01:23 PM
Joined: Jun 2002
Posts: 6,440
MI
doitmyself Offline OP
doitmyself  Offline OP
Joined: Jun 2002
Posts: 6,440
MI
4 cyl. Ford Engine on Kohler Standby Generator. VERY stout radiator/cooling fan system. My service tech. shot a few IR readings around the thermostat and got 130F +/- and said the unit is running low and needs a hotter thermostat. I shot the oil filter at 175F and the oil pan at 185F.

Where is the best place to take IR readings on an engine to determine and/or interpret if it is operating at the correct temperature?

Thanks

Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679700
02/27/18 01:30 PM
02/27/18 01:30 PM
Joined: Dec 2017
Posts: 3,007
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,007
SE British Columbia, Canada
Certainly the oil pan and oil filter will be hotter than the coolant. I believe the service tech took the readings at the correct spot, that is at the thermostat. I'm not sure what Kohler suggests but if this was a car engine 175-195 F would be more appropriate and if was a modern GM V8 it would be 210 F.


If you want the job done right......do it yourself.
Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679719
02/27/18 01:44 PM
02/27/18 01:44 PM
Joined: Oct 2014
Posts: 12,579
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,579
Idaho
The oil filter will give you close to the oil temps in the oil filter. The oil pan will give you close to the oil temps in the oil pan. The radiator will give you close to the coolant temps in the radiator area where you shoot the temps and the T stat housing the temps of the coolant in that area. I would guess the t stat should be 160* f or higher. The tech is telling you the coolant temps are too low. Why measure the oil temps?


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679721
02/27/18 01:48 PM
02/27/18 01:48 PM
Joined: Jun 2002
Posts: 6,440
MI
doitmyself Offline OP
doitmyself  Offline OP
Joined: Jun 2002
Posts: 6,440
MI
The thermostat housing sits on the engine front, perched up a bit, directly in front of the cooling fan. It gets bathed in cool air and I wonder how much effect that has on the IR reading. Ford VSG-413 engine:


Good pic here if my link doesn't work: https://www.manualslib.com/manual/805435/Ford-Vsg-411.html#product-VSG-413

Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679731
02/27/18 02:04 PM
02/27/18 02:04 PM
Joined: Sep 2015
Posts: 3,939
Connecticut
69GTX Offline
69GTX  Offline
Joined: Sep 2015
Posts: 3,939
Connecticut
From my use of an IR gun on super-heated steam boilers and combustion furnaces, the air temp has little to no bearing on metal surface temps. If I were doing it, I'd also want to know the highest temp on the engine block/heads.


----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679744
02/27/18 02:18 PM
02/27/18 02:18 PM
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
Don't take the temp on shiney or unpainted surfaces


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Re: Where Measure Engine Temp. with IR [Re: Chris142] #4679759
02/27/18 02:38 PM
02/27/18 02:38 PM
Joined: May 2015
Posts: 177
Virginia
GravelRoad Offline
GravelRoad  Offline
Joined: May 2015
Posts: 177
Virginia
I doubt that a temp is spec using an IR gun anywhere on that generator. So no real answer can be given.

I assume it was under load and fully warmed-up before IR temp reading? Is the mechanic trying to say it has a bad T-Stat, low on coolant (air pocket), bad water pump or bad design? If he's using and IR gun, he should be able to tell you why it's running cool since he "knows" it's running cool.

Seems a water cooled generator should have a temp gauge. shrug


2016 Subaru Outback Premium 2.5. PP 5w30 oem filter
2018 Hyundai Kona 1.6T. Lifetime dealer free oil/filter change
Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679847
02/27/18 05:30 PM
02/27/18 05:30 PM
Joined: Jun 2013
Posts: 1,126
iowa
Traction Offline
Traction  Offline
Joined: Jun 2013
Posts: 1,126
iowa
Probably not an accurate way to measure internal coolant temps, since IR is measuring the radiated surface temperature.


Certified Tire Service Instructor since 2009
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Re: Where Measure Engine Temp. with IR [Re: doitmyself] #4679912
02/27/18 06:36 PM
02/27/18 06:36 PM
Joined: Jul 2010
Posts: 19,281
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 19,281
PNW
A thermocouple taped onto the surface with aluminum tape will give a better temperature reading. IR gun will most likely be low because it assumes a black body radiating surface.


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