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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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One thing I will do, and you might consider this yourself is to disconnect the heater and flush it seprately from the engine flush. Might be gunk in the heater core that you may be able to get rid of more effectively doing it seperately than just doing a straight engine flush. - Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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Since you have an IR thermometer, shoot the radiator for cool/cold spots, this indicates blocked areas. For a more accurate reading with the IR when checking the thermostat opening temp place a piece of electrical tape on the housing and use that as the IR target.
Good luck!!!
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"Rudeness is a weak man's imitation of strength" - Eric Hoffer |
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Be aware that an infrared thermometer can only read non-reflective materials and the sample "spot" grows the further away you are from what you're measuring. If you are reading a shiny spot, or bare metal, expect to have readings that don't match reality. Ideally measure something dark or corroded from a close distance (<6") for the best results.
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have to wait until the weekend for the acid to arrive, then will proceed
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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Let us know how the citric flush goes.
Something I'd been curious about doing myself.
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1981 240D 4sp manual. Ivory White. |
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will do -- before/after temps on the same test route
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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had the cooling system apart when i removed the radiator today and drained the block -- did the citric acid flush first, but really, very little effect cause the system was very clean, no sludge, scale, so on this engine i don't see clogging as the culprit.
i am replacing the almost new stat with a Stant 13588, and this time i tested both in boiling water -- major difference in the degree of opening, so the one i had installed may have been not fully opening, i will install the stant and after removing the radiator, found much debris between the rad and the ac condenser, and a repair someone had made with epoxy -- can't believe it held for years -- so a new rad is coming next week so i won't know which issue was causing the hot temp -- but i will suggest, as you probably already know, that not all stats are created equal, and always test them before installing
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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I just read down through this and was wondering if the stat was a higher temp rating. I also wondered if you downshifted on the hill? If you allow the rpm to fall too much the cooling fan will not cool the engine properly....sounds like you are on your way to getting it all tip top.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
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The thermostat issue sucks.
I replaced one recently that failed after only a year and a half... Did you complete the full citric flush as per the FSM (degreasing, etc)?
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1981 240D 4sp manual. Ivory White. |
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
#43
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yes, detergent, etc. -- but even before i owned it, this is one of those mercedes that came with the maintenance booklet, all the maintenance done meticulously -- it looked the same before and after the flush still don't know what the temps will be, will know next week -- it is a very cheap rad, about $85 off ebay/amazon, new, but the company has good reviews - klimoto, i think -- and on a manual tranny 240d, is very easy to replace -- will let you know how it looks
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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I went through this with the SL last year. Original 1983 stat was lazy and wanted to run 100C all the time. Bought a new stat from the dealer and threw it in. Worked for ONE DAY, then overheating again. I went through everything thinking that an OE stat couldn't possibly be bad that quick. Finally replaced it with a Wahler and tested both in boiling water. Wahler was wide open, OE replacement couldn't even slip a fingernail in the gap. Overheating solved. Never assume that "New = Good" I learned that lesson. |
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sounds exactly like what i just experienced
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81 240D: Lola 77 toyota chinook: Carlito 93 chevy k1500: Cowboy |
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