firenut Posted March 24, 2015 Share Posted March 24, 2015 So at the recommendation of all of you i have begun to tear down the motor of my 50 Mack. I am confused as I have noticed an "add on" to the air intake... can any of you identify what this is?Thanks in advance.. Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/ Share on other sites More sharing options...
j hancock Posted March 24, 2015 Share Posted March 24, 2015 The flex tube between the exhaust manifold is to provide warm air to help prevent icing of the carb. during operation. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-283839 Share on other sites More sharing options...
Gmerrill0516 Posted March 24, 2015 Share Posted March 24, 2015 I agree it is for cold weather operation to keep ice from forming in the carb. It must be optional equipment or newer than the '49 I am working on as mine does not have that arangement on it. It is otherwise identicle. Keep us posted on what you find. Good luckGreg Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-283844 Share on other sites More sharing options...
fxfymn Posted March 24, 2015 Share Posted March 24, 2015 Are you going to remove the engine to work on it? If cleaning up and getting the truck looking good is one of the goals it would make detailing the engine and engine compartment much easier. It would also allow you to check the clutch and pressure plate. Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-283848 Share on other sites More sharing options...
609albert Posted March 24, 2015 Share Posted March 24, 2015 I see you have the fenders off , radiator supports etc.,how far are you going to take it down? Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-283871 Share on other sites More sharing options...
firenut Posted March 25, 2015 Author Share Posted March 25, 2015 Thanks everyone.. That's makes sense... I am not planning on a complete removal... I have a stuck #5 Cylinder and have to remove the head for that... My plan is to remove the heads, check for/fix issues.. do what i have to to get her running, and re-do the brake system. After that (and after saving lots of money) the overall plan is to send to someone like Matt Pfal to completely re-paint/re-chrome the system.Anyone have any idea how to remove the exhaust manifold? The exhaust pipe is one piece and I cannot get to the bolts to remove with the cowl... Looks like it will have to come off in one piece...Thanks All Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-283983 Share on other sites More sharing options...
609albert Posted March 25, 2015 Share Posted March 25, 2015 the exhaust manifold I think is actually 3 pieces pressed together. Matt did my '54 LS85 in 2011 ,he has all the equipment ,tools & parts to work on Macks. Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-284047 Share on other sites More sharing options...
Loadstar Posted March 25, 2015 Share Posted March 25, 2015 The best tip for removing the exhaust manifold is patience. The intake and exhaust manifolds are bolted together,so once unbolted it will all come out as one. The exhaust manifold is three pieces, but time and rust has probably fused it together. If it's not cracked I would leave the exhaust manifold together. If you separate the intake and exhaust manifolds, check the intake for any holes. The three I've had apart all had holes where the exhaust gases go up into the intake manifold heat "riser". Ratchet wrenches would be a big help with some of the harder bolts to get at........Good Luck Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-284067 Share on other sites More sharing options...
Gmerrill0516 Posted March 26, 2015 Share Posted March 26, 2015 Loadstar is correct. All the nuts come off all the studs for intake and exhaust and it can all slide apart at once. My down pipe is welded to the last section of the exhaust manifold which was otherwise in good shape. I cut the exhaust pipe down onder the truck with a sawzall and pulled it all up and out. Reversed the process to put it back. I have the sawzall with the special reverse that puts the metal back in place...well not really. I put the mig welder to work and it's as good as new.I would NOT try to separate the exhaust manifld sections unless you have to.Greg Quote Link to comment https://www.bigmacktrucks.com/topic/39384-707a-air-intake-x2/#findComment-284185 Share on other sites More sharing options...
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