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#1
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300sdl Overheat #17 head
Hi,
I recently purchased an 87 300sdl. The car gets up to running temp in about 10 blocks. It has been running over 100 degrees on the highway even without the AC on. At idle, I can get the temp to come down by reving the engine. New MBZ thermostat New Fan Clutch Behr Radiator Looks fairly new #17 Head Aux fan comes on OK My mechanic thinks it's the water pump or head but he's not sure. I'm thinking the water pump since the head was replaced already(don't know when) and the car gets up to temp so quick. Also the reving at idle will bring the temp down quick. Any other thoughts? Thanks |
#2
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What about air in the system or a t-stat installed backwards?
Can you remove the t-stat, take it for a test run, and see if it still over heats?
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#3
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How long ago was the #17 head installed?
Sixto 87 300D |
#4
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I had the same problem before I installed the new thermostat.
I'm not sure when the new head went in. Car is very well taken care of. |
#5
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Running temp within 10 blocks... how hot or cold is the radiator core at that point? How hot or cold is the lower hose? How stiff is the upper hose? I wish I had an IR thermometer to give you reference numbers. Hint to someone who has such a device
Sixto 87 300D |
#6
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Have you done a test to see if upper radiator hose is pressurized from a cold start? When you wake up tomorrow morning, pop the hood. Make sure there is no pressure in cooling system, then crank the car up and see if the radiator hose pressurized within 5 minutes or so...let us know how long before it gets hard. No homo.
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1987 300TDT - 195,000 (Original #14 head) 1993 190E 2.3 - 105,000 1981 300D - 250,000 |
#7
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Ok. I'll test to see if my car has "morning wood"
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#8
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"10 blocks" is a bit relative. In some areas you could to that in 90 seconds, in others 10 minutes. What's the real deal, along with "morning wood" test results?
__________________
James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k |
#9
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OK. The morning stiffness test results:
Easy to pinch, little to no pressure. Also, there's little pressure after the car sits for an hour. Radiator cap inspection looks good, seals look ok, 140 stamp. I'm up to temp in 1/2 mile or less. |
#10
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Quote:
__________________
James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k |
#11
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I let her idle for 5 minutes this morning and there was no notable increase in pressure in that hose.
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#12
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Sounds like it's time to consider a clogged oxidation catalyst.
Sixto 87 300D |
#13
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The engine has no visible blowby.
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#14
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Hydraulic valves wont as much. If the tstat has not been replaced thats a good place to start.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#15
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Tstat has been done. Are there signs that it could be the water pump?
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