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#1
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103 engine 300E bleeding cooling system?
Hello
My 1987 300E does not have a bleed screw in the top of the thermostat housing. To bleed the cooling system there is a bolt on the top of the head. I understand that the housing was updated with threaded hole and bolt / crush washer.. I am not sure which point is higher, the bolt in the head or the screw in top of the thermostat housing? Why and when was the screw added to the thermostat housing? I will soon be replacing my thermostat and was wondering if I should change the housing to the updated part while I am at it? |
#2
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While I assume the original method would work fine, it's <$30 from the dealer to get the updated housing and banjo fitting, plus you'd need some hose for the line that goes across.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#3
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my setup is a bit different, there would be no fitting for a hose that goes across. the updated part just has a threaded hole in the top of the housing that has a bolt and washer, the bolt is loosened and or removed to bleed the system
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#4
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I just went out and looked at the vehicle, the top of the thermostat housing is about two inches higher then then bleed bolt in the top of the cylinder head
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#5
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The screw plug in the top of thermostat serves 2 points , one, to take a sensor , 2 to help bleed the system, on my 103 it has both one on thermostat and also one on the block rail and i use them both to purge the air .I must say it is hard to get all the air from the system. Just about to do this job again as the coolant needs changing and i am not looking forward to doing so .
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#6
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Quote:
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1990 190E 3.0L |
#7
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I still think the bleeder hose is the best option. You might need to update the coolant reservoir as well but I've never had any issues bleeding the system on my M103s.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#8
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If you're already replacing the t-stat then filling the block with coolant to the height of the t-stat will help getting it bled a little easier, though generally as long as there is a reasonable amount of coolant in the engine it will bleed without much trouble once the t-stat opens.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff |
#9
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This is interesting .Do i need the engine running at the same time ? Can you give me more information please?. or be more specific .
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#10
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Quote:
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1990 190E 3.0L |
#11
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Yes good idea , but i would think if the thermostat is closed then it will interrupt the flow of coolant through the system . I am interested and i will use this method just need to know as the thermostat is closed, and the water is cold in the system, will it still circulate .
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#12
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Quote:
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1990 190E 3.0L |
#13
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ismalley well proof will be in the eating .The next time , in a few weeks time that will be after i fit my new wing . Then it will be time to do this coolant change And i will use your method ..I will then let you know just how the coolant refill goes .
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#14
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Should be easy. Remember Make sure the system is all back together and everything is buttoned up. No need to turn on the car. Just start filling from the coolant reservoir and when it starts to get full, stop and jumper the aux wp and let it circulate coolant throughout system. Keep aux wp running while you add more coolant. When you reach the satisfied level, you're done.
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1990 190E 3.0L |
#15
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When I changed the thermostat recently, I parked with the passenger side uphill and slightly nose up. That way, the reservoir cap is undoubtedly the highest point in the system.
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