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#1
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Drain Coolant from Engine Block on 107, Where's the Drain Plug (screw)
I have a 78 450sl, I want to drain the coolant from the engine block as part of my radiator flush (doing a citric acid flush).
Does anyone have a picture of where the engine block drain plug is for the coolant? Draining the radiator is easy, but coolant/flush fluid remains in the engine block so I want to get it out. Thanks. |
#2
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There are two, one on each side. Might be tough to break loose, but it's worth giving it a try. I can't remember if they are regular hex bolts of allens. The service manual shows a photo of one of them - looks like a hex.
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles |
#3
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good luck, could not budge them on my 72
I opted to take off hoses and junction at block, used hose full foce through that until it ran clear, good time to renew the hoses , the small connector hose and tstat
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#4
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Couldn't get mine out, and mine are allen.
When I put the 3.5 heads onto my 4.5 I used a garden sprayer as a "Pressure washer" to hose down the inside of the block & I used a 1/2" ID hose hooked to a Shop Vac to suck the water out. Worked very well and my engine ran MUCH cooler after this. Now, taking your heads off to flush the block is probably a bit extreme, so do what Ron did & hook up a garden hose until it runs clear!
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k |
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