Where should i shoot the engine to get the temp with my IR thermometer?

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-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

someher in the center of the block, or below the valve cover adjacent to the piston walls.

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82' 300SD

I would shoot the head near the temperature sensor on the left side if I was trying to verify the gauge. What are you trying to accomplish?

That's where I checked it. Lucky me my temp gauges are accurate.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo

this exact thing, trying to make sure my gauge is correct.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

FYI: If you use an IR thermometer on metal surfaces, the reading will be affected by the emissivity/reflectivity of the metal surface. Some high-end IR guns have an adjustment, but most do not. Try NOT to shoot at a bare metal surface; a painted (preferably flat black) metal surface will give you a more accurate reading.

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Current rolling stock:
2001 E55 183,000+ Newest member of the fleet.
2002 E320 83,000 - The "cream-puff"!
1992 500E 217,000+
1995 E300D 412,000+
1998 E300D 155,000+
2001 E320 227,000+
2001 E320 Wagon, 177,000+

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.

I am not positive but i don't thin an engine with 327,xxx miles is going to have any bare metal surfaces. i think mine are all covered in crud

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

i assume you want to check coolant temperature. why not 'shoot' the intake hose to radiator?

The hose would not be accurate, the outside surface is much cooler than the coolant. Maybe the metal thermostat housing where it connects to the upper hose would give you a better idea of the coolant temperature as it enters the radiator.