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  #1  
Old 03-28-2005, 05:23 PM
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Question How for diesel engine to warm up?

Hey Friends! I searched the posts and too my surprise didn't find the answer to my question.

I recently replaced the thermostat on my 82 300SD. The coolant temp runs about 85 C once completely warmed up. I live in Massachusetts where the outside temp is 30-50F right now. The "problem" is that it seems to take a full ten (10!) minutes for the engine to warm up all the way. It climbs slow and steady up to 85. I do mostly about town driving so most of the time the car isn't completely warm. It definitely performs with more pep and better shifting once up to 85. Should I have to wait so long? Seems like my wife's Honda is up to temp within two blocks. What do you think?

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Old 03-28-2005, 05:28 PM
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10 minutes to warm up to normal operating temperature seems normal to me for a 617 engine.
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  #3  
Old 03-28-2005, 06:01 PM
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The 617 seems to take forever to warm up.

The 603 warms in 1/2 the time. Probably makes it to 80° C. in seven minutes or so, driven very easily.
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Old 03-28-2005, 07:30 PM
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I noticed that if I let mine sit in the driveway and idle it will never get to proper temp. Only after driving will it climb to normal operating temp.
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  #5  
Old 03-28-2005, 07:48 PM
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The Honda also does not have a real coolant temp gauge. It is programmed to simply stay in the middle regardless of temp unless it gets way too hot or way too cold.

Mercedes have a coolant temp gauge that actually displays the correct coolant temp.
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  #6  
Old 03-28-2005, 08:29 PM
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I wouldn't let it sit and warm up-mine smokes and starts to load up with carbon if allowed to idle excessively-it does warm up quicker than 10 minutes, though-you might want to check the stat suspended in a pan of hot water with a thermometer-I've had a few that didn't close all the way and opened early. I also wouldn't put a lot of stock in the factory gauge-after 20+ years, they're usually off a little.
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Old 03-28-2005, 10:55 PM
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Actually the engine really isn't "warm" until the oil pressure drops off to 1.5 bar or so.

My SDL takes a bit to warm up, the 606 warms up about twice as fast.
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  #8  
Old 03-28-2005, 11:03 PM
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If you have the heater cranked it will take even longer to heat up. If you want it to heat faster it needs more load. I f i leave mine idling i turn on the lights and the rear defrost to give it some load and it heats a little faster. My TDI beetle has a harder time heating up than my 87td. Remeber diesels are heat engines and they use there heat very effiecently.
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  #9  
Old 03-29-2005, 07:41 AM
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Thanks for all the useful comments! I can stop worrying now. Cheers!
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200D 1967 gone but not forgotten
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  #10  
Old 03-29-2005, 09:20 AM
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I usually let it warmup until I see the needle start to move off 40 then drive conservatively until it reaches operating temperature.
Then I get on it!

Danny
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  #11  
Old 03-29-2005, 10:39 AM
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Interesting, mine usually reaches 80 after a few miles and doesn't go any higher under any circumstance.
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  #12  
Old 03-29-2005, 11:08 AM
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Mine takes about 2 miles worth of conservative driving or about 15 minutes of idling to reach its normal operating temperature, my dads takes about twice as long and runs cooler in general, probably a t-stat issue but it still gets up to 80-81C so we're not concerned for now.

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