| len47merc | -- 01-13-2016 @ 12:22 PM |
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What is the complete cooling system capacity for '42-'48 with completely original, stock components? The SHOP MANUAL in Fig. 5 on page C-4 states 17 quarts. Others have stated on this forum 21 quarts (5 gallons distilled water or water/AF mix plus 1 quart of WaterWetter/hy-per lube/etc.). EDIT - Secondchancegarage.com shows 22 qts without heater, 23 with (my '47 has a heater). Appreciate any more definitive resource material/data that anyone may have. Steve This message was edited by len47merc on 1-13-16 @ 12:52 PM
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| cliftford | -- 01-13-2016 @ 5:04 PM |
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Steve,for what its worth, my FORD service manual says 22 qts. I'm assuming that's with no heater, since heaters were not standard equipment in those days.
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| Drbrown | -- 01-13-2016 @ 8:56 PM |
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Echoing the above, original 1946-48 Ford/Merc/Lin Service Manual: Pass 6 cyl = 14.5 qts Pass 8 cyl = 22 qts Pass 12 cyl = 27 qts Truck 6 cyl = 17 qts Truck 8 cyl = 23 qts All above presumed without heater. However, the specific radiator furnished in a vehicle affected its cooling system capacity. See Dealer's Service Bulletin #8000 Pg1 for chart displaying Radiator Part No. vs system capacity as follows: 15, 17, 21, 22, 23, 33 and 42. Obviously and without deciphering the radiator part nos. some of the latter are 6, 8 and 12 cylinder and truck systems. This message was edited by Drbrown on 1-13-16 @ 9:16 PM
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| len47merc | -- 01-14-2016 @ 5:36 AM |
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Great information guys - thanks to you both! Steve
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| len47merc | -- 02-06-2017 @ 9:15 AM |
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Performing some winter maintenance and am refloating this discussion from last Jan '16 with a follow-up question. Drbrown mentioned Radiator Part No. vs 'system capacity'. Looking at the back of the radiator on the '47, embossed in the top tank just to the right of the passenger side top return hose is an underlined '21A', under which the letters 'MO' are embossed in the same font and size. Is it a correct assumption that this is the part number Drbrown is referring to? If so, then would it also be correct to assume the '47 has a 21 quart 'system capacity' (or 22 quarts as cliftford metioned given it has a heater)? Any idea what the 'MO' refers to? I run a very low concentration of antifreeze (AF) in the Merc for spring-summer-early fall driving (approx. 15% given the freezing point check). We recently had (unusual for us) low single-digit temps here and, although the car is maintained in an attached, insulated garage that in the last decade I can count on one hand the number of times the internal temp fell to below 50 degrees, I want to increase the level of coolant/AF to 30-33% for peace of mind to ensure coverage in the event I do take it out for any reason this winter (or one of the two garage doors is mistakenly left open during a cold snap). Easy enough to calculate how much AF to add in this circumstance (or the reverse in the spring) - just want to ensure the system capacity (not radiator capacity) is correct for the calculations so I can get it right the first time and not have to go through multiple tweaks to get to the desired concentration. Steve This message was edited by len47merc on 2-6-17 @ 9:18 AM
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| 42wagon | -- 02-06-2017 @ 11:33 AM |
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Len My original 1942 owners manual says 22 quarts. I am assuming this is without the heater since none is mentioned in the manual. I believe that the 21A you are looking at is a part designation since 21A was the number for 42 Fords. MO probably refers to a Ford radiator plant or outside supplier. 42 Wagon
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| oldford2 | -- 02-06-2017 @ 1:55 PM |
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Let's keep things simple. Fill with your choice of coolant 1" below the top of the radiator. Run thru a heat cycle and refill if necessary. No research required
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| len47merc | -- 02-06-2017 @ 2:12 PM |
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Respectfully submitted you are missing the point oldford2. The system is currently full of relatively fresh coolant installed just prior to Gettysburg last summer. I only wish to drain as much coolant as is necessary in order to waste as little of the existing fresh mixture as possible. If I've an accurate count of the system capacity the exact amount of fresh AF needed to be added to hit the target can be calculated, taking into account some percentage of the AF already in the system will be lost during draining. I do not care to dump the entire system and refill when a calculated and measured 3-6 qts will do the trick. It's easy to calculate and simple to me at least to be as efficient and economical as possible. Given the cost of the AF these days my pocket and personal time can use all the help they can get! Steve
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| len47merc | -- 02-06-2017 @ 2:44 PM |
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To put this to bed for good this time this year, I assumed a 23 quart capacity per cliftford's original reply and 42wagon's 'second' (albeit referencing a '42 versus a '47) and, using antifreeze concentration charts, my AF tester and some simple homespun equations intended to drop the freezing point below 10 degrees, drained a measured 3.75 quarts out of the radiator (at current ~15% AF) and refilled with pure AF to the normal fill level to prevent spitting. Drove the car for 45 minutes and let it cool and rechecked the new now-mixed fluid. Moved the freeze point down from ~23 degrees to ~5 degrees which only slightly overshot my targeted sub-10 degrees. So the 23 quarts assumption had to be close to on the mark. Thanks guys for weighing in. Wanted to learn as well what the markings on the radiator tank indicated - if anyone can add to and/or confirm the '21A' and 'MO' it is appreciated. Cheers - Steve
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