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Old 03-28-2005, 05:23 PM
Committed to 400k!
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Location: Marlborough, MA
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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?

Orion Parrott

300SD 1982 202k
300TD 1987 275k
Suburban 1987 6.2D 4x4 156k
200D 1967 gone but not forgotten
380SE 1985 gone
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Old 03-28-2005, 05:28 PM
Veloce300DT's Avatar
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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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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.
'85 300SD (formerly california emissions)
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Old 03-28-2005, 07:48 PM
Ali Al-Chalabi's Avatar
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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.
Ali Al-Chalabi

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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.
1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
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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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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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Old 03-29-2005, 07:41 AM
Committed to 400k!
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Location: Marlborough, MA
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Thanks for all the useful comments! I can stop worrying now. Cheers!
Orion Parrott

300SD 1982 202k
300TD 1987 275k
Suburban 1987 6.2D 4x4 156k
200D 1967 gone but not forgotten
380SE 1985 gone
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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!

1984 300SD Turbo Diesel 150,000 miles

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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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Old 03-29-2005, 11:08 AM
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Location: Grand Rapids, MI
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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.

-diesel is not just a fuel, its a way of life-
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