razorback11 Posted January 3, 2016 Share Posted January 3, 2016 I am putting my 65 Mack B-61ST back together after a year of scraping, scrubbing, desolving, sandblasting, plasma cutting, priming and painting...well you get the picture. Speaking of pictures, I took a bunch when I dismantled the truck to help me when I get to the "putting it back together" stage where I am now. Problem is, my photography skills aren't any better than my truck building skills so I nee your help on some things. On the ditch side of my END 711, toward the rear of the block, a little above the removable side plates (where the lifters can be accessed), are two brass 90 degree fittings that had lines on them. The front most fitting had a line that went into the top of the Air Compressor. My first question is: Is this a oil line or does it bring coolant into the compressor? (I am assuming Oil but don't know). The rear most fitting has a line that runs to a brass canister like thing that was just hanging from other lines that went to the heater and elsewhere. It appears to me to be some sort of heat exchanger for the heater or something. Can someone tell me what that thing really is, what it does, and if that line from the block delivers oil or coolant? I have two photos I will attempt to load. Both are when everything was dirty and nasty. One shows the lines coming off the fittings with that canister, and the other are just the fittings themselves. I would appreciate any info you experts could provide. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/ Share on other sites More sharing options...
39 Baby Mack Posted January 3, 2016 Share Posted January 3, 2016 The first fitting for the compressor is for water (oil feed on a 673 is internal through the auxiliary drive), does the cannister have any wires going to it?, how many hoses or lines going to it?Sent from my SM-G900V using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318442 Share on other sites More sharing options...
theakerstwo Posted January 3, 2016 Share Posted January 3, 2016 That looks like a block heater but the compressor is lubed from the inside of the engine.No oil line to it. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318443 Share on other sites More sharing options...
felicello122 Posted January 3, 2016 Share Posted January 3, 2016 Both are water lines to compressor Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318446 Share on other sites More sharing options...
MACKTRUCKS4 Posted January 3, 2016 Share Posted January 3, 2016 Both fittings are coolant. The canister is a block heater, if you look close, you can see where the cord was cut so I'm going to say that is doesn't work anymore. Quote Live every day like it's your last, because one of these days, it will be. Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318447 Share on other sites More sharing options...
eddeere Posted January 3, 2016 Share Posted January 3, 2016 This may help. First picture top line goes to block one in back comes off bottom of water pump. Second picture shows drain valve on block. As mentioned coolant lines for compressor. Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318472 Share on other sites More sharing options...
terry Posted January 3, 2016 Share Posted January 3, 2016 Alot of times people would use the drain place for one end of a tank type heater Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318474 Share on other sites More sharing options...
razorback11 Posted January 4, 2016 Author Share Posted January 4, 2016 I believe you have all nailed it. The canister thing has wires running into to that have been cut so it was probably a block heater. So let me ask then, If I run a line from the forward fitting to the air compressor, and replace the rear fitting with a petcock/drain valve, does that sound like a way ahead? Bulldog, I see your first picture, the line coming off of what I would term the forward fitting, but I can't see where it leads to. Can you explain? Thanks all. Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318506 Share on other sites More sharing options...
eddeere Posted January 4, 2016 Share Posted January 4, 2016 You could put a pipe plug in the rear hole. The forward fitting hose makes a U and goes into the head of the compressor. The bottom hose comes off the base of the compressor runs along the block behind the injection pump and goes to the bottom of the water pump. Quote Link to comment https://www.bigmacktrucks.com/topic/43364-what-are-these-two-lines-from-the-block/#findComment-318559 Share on other sites More sharing options...
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