h67st Posted October 16, 2020 Share Posted October 16, 2020 Anybody know what this valve is for? It's on the inlet side of the pump after the primer/transfer pump. Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/ Share on other sites More sharing options...
doubleclutchinweasel Posted October 16, 2020 Share Posted October 16, 2020 Nope! But you certainly got me interested! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462489 Share on other sites More sharing options...
Freightrain Posted October 16, 2020 Share Posted October 16, 2020 Hmm, someones emergency shut off? Or was it a security device so that it won't start? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462493 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 Lubrication for the air starter just a guess ..... bob Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462495 Share on other sites More sharing options...
mrgumby Posted October 16, 2020 Share Posted October 16, 2020 52 minutes ago, Freightrain said: Hmm, someones emergency shut off? Or was it a security device so that it won't start? That exactly what I was thinking . Dunno Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462499 Share on other sites More sharing options...
Freightrain Posted October 16, 2020 Share Posted October 16, 2020 1 hour ago, mowerman said: Lubrication for the air starter just a guess ..... bob I have one of those set ups on my truck, but it is not a hand valve. Can't recall if mine is on the return line?, but goes to a poppet valve that feeds into the air line to the starter. 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462502 Share on other sites More sharing options...
doubleclutchinweasel Posted October 16, 2020 Share Posted October 16, 2020 32 minutes ago, Freightrain said: I have one of those set ups on my truck, but it is not a hand valve. Can't recall if mine is on the return line?, but goes to a poppet valve that feeds into the air line to the starter. Uses fuel for lubrication? Just asking. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462503 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 Maybe some sort of high pressure relief valve not sure of the hand lever with pressure spring????????? Bob Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462504 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 2 minutes ago, doubleclutchinweasel said: Uses fuel for lubrication? Just asking. That’s what kenworth dealer parts man told me years ago .... air starter was lubricated by diesel fuel line .... my truck doesn’t have one because I added the air start ... bob Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462505 Share on other sites More sharing options...
doubleclutchinweasel Posted October 16, 2020 Share Posted October 16, 2020 6 minutes ago, mowerman said: That’s what kenworth dealer parts man told me years ago .... air starter was lubricated by diesel fuel line .... my truck doesn’t have one because I added the air start ... bob Huh! Did not know that. But, diesel fuel would be a pretty good cleaner/lube for an air motor, I suppose. Learns something new every day... Thanks, Bob Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462507 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 It was originally 24 V electric starter but since mine does not have an oiler are usually just pull off the inlet line and shoot Jack oil in the starter once in a while.... bob Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462515 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 Yeah no problem actually that fellow showed me a illustration he had in a parts book There’s another lost art...:the parts book what the hell is that ha ha Ha... bob 2 Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462516 Share on other sites More sharing options...
Freightrain Posted October 16, 2020 Share Posted October 16, 2020 Ya, my air starter got stiff a year ago, so I bought the automatic oiler and installed it. Tap off the fuel line. It uses fuel pressure to fill a small cavity, then the spring closes that valve. Then once you hit the air button, it pushes that volume of fuel into the starter to lubricate the vanes. 3 hours ago, mowerman said: Maybe some sort of high pressure relief valve not sure of the hand lever with pressure spring????????? Bob That is the feed side, so I can't see any reason for a pressure relief. I think the spring is just there to hold it open. I would bet if you rotate it over about 90* CW, the spring will then hold it closed. Just guessing. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462531 Share on other sites More sharing options...
doubleclutchinweasel Posted October 16, 2020 Share Posted October 16, 2020 2 minutes ago, Freightrain said: Ya, my air starter got stiff a year ago, so I bought the automatic oiler and installed it. Tap off the fuel line. It uses fuel pressure to fill a small cavity, then the spring closes that valve. Then once you hit the air button, it pushes that volume of fuel into the starter to lubricate the vanes. That is the feed side, so I can't see any reason for a pressure relief. I think the spring is just there to hold it open. I would bet if you rotate it over about 90* CW, the spring will then hold it closed. Just guessing. Great description of the lubricator. I can't see the point of this one either though. Would like to know if anybody figures it out! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462533 Share on other sites More sharing options...
Mark T Posted October 16, 2020 Share Posted October 16, 2020 That spring looks a lot like a spring from the clutch on a Mack with a cable Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462536 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 I have a 1983 motor manual I can pull out if nobody can figure it out... and yes Larry,,,, I had forgotten the starter oiler was tapped into returning line .... thanks for that... bob Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462537 Share on other sites More sharing options...
mowerman Posted October 16, 2020 Share Posted October 16, 2020 Was just thinking maybe automatic either perhaps??????? Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462538 Share on other sites More sharing options...
Vladislav Posted October 17, 2020 Share Posted October 17, 2020 That's an emergency fuel shut-off valve. My WW2 Mack has it as stock equipement described in the factory manual and the parts book. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462580 Share on other sites More sharing options...
Vladislav Posted October 17, 2020 Share Posted October 17, 2020 (edited) But really strange to see the spring. My truck has a wire which goes to the dash with a knob on. The same as the rack control setup. Hmm... That small "lee" at the left of the pic too looks like a clamp which was supposed to attach the wire sleeve in the past. Edited October 17, 2020 by Vladislav Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462581 Share on other sites More sharing options...
mowerman Posted October 17, 2020 Share Posted October 17, 2020 Aaaaaaaaaaaaaaaaaarite you solved it ... bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462582 Share on other sites More sharing options...
Vladislav Posted October 17, 2020 Share Posted October 17, 2020 I just tried my best to proof the reputation the site puts above a member's avatar 2 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462583 Share on other sites More sharing options...
doubleclutchinweasel Posted October 18, 2020 Share Posted October 18, 2020 Shut off makes sense. Appears to only have 1 in and 1 out. So it didn’t look like a feeder for anything. Spring was probably put on to hold it open after the operating cable broke and left somebody cussing on the side of the road! 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462607 Share on other sites More sharing options...
h67st Posted October 19, 2020 Author Share Posted October 19, 2020 I like Vlad's answer and dcweasel's reason for the spring. I'm going to look through my repair manual to see if there's anything mentioned about it. The thoughts about starter lube are good--I'll have to keep that in mind when I put the truck together. Quote Link to comment https://www.bigmacktrucks.com/topic/64597-what-is-this/#findComment-462642 Share on other sites More sharing options...
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