theakerstwo

Mack sure that the stop cable is not pulled alittle bit when runing

3306 i should say glenn

make sure and get one that is EPA approved because they put off some emisions know what i mean. glenn

that 1673 is a old engine , not many around any more or people that remember them, that was the forunner for the 3305. glenn

Let me ask or comment on the ideal. Years ago i did a 3 axle all power set up but i knew it had to be a real chore in the start. I used rockwell and peterbilt suspenion and one leveling valve so that was simple cause i could not lift one axle because when you lift any one of the axles it puts too much working angle on the ujoints and it will tear up too many things like the trans for one. On this set up they did not raise the 3rd axle anyway and i dont think you will ever be able to raise the 3rd axle with out pulling the drive line. If you can do it get a patten on it. I whent to a rockwell dealer and he looked up what i need and we only needed 1 power divider.It was on the middle unit and the front had a stright drive no prower devider and the back was a rear/ rear. I was told that the front would pull all time and the power would be divided between the front and the back 2 axles which they can divide the power between them self. I think i could have used a air lockout in front also but keep it lock all time and saved the money that the extra parts cost. The ujoint working angle is very importaint and if you need more infro on that i can scan sone for you to convince you that the angles have to stay within a rangle when the joint is turning. glenn

When i used to keep certified on cummins i had to go to school at cummins at Arlington and he told us on the 5.9 and 8.3 that the springs had to be replaced to a 65 lb spring to keep the valve off of the piston and i got him to tell me what he knew about that and it came clear to me what was going on. On a normal engine the compression and combustion holds the valve tight as well as the spring up to the seat.That pressure is on the valve when the piston is traveling up to the top untill the cam opens the valve. There is little pressure on the exhaust after it passes out into the manifold. Now then if you put a butterfly valve on the manifold and hold a 50lb back presure on the manifold and no more than that on the top of the piston because there is no combustion and very little compression there is only the valve sping pressure holding the valve closed and when the piston starts up from the bottom and the exhaust is closed there is no pressure on top of the piston to hold the valve closed when there may be 50lbs of back pressure in the manifoild and it is trying to push back against the back side of valve and open it and once it opens it will stay open until the piston comes up and hits it. I have seen the blue ox brake installed on DD and it is not uncommon to pull the head and see where the valve have been hiting the pistons but have not dropprd one yet. It is scarry to think about.Old mecedels engine had that brake system from the fractory but there valve sping were heavy and it did not do much good. I think the exhast brake may help but to me it would not be worth much to me on a mack because you dont have but a 673 cc engine any way. The guys that i have talked to that have the exhaust brake on dodge trucks say they work good at 2500 to 3000 rpm but no good below that and i can beleive that. I have a jake brake on a 315 in a b61 and it does pretty good but only keeps you off of the service brake on small hills but not as good as a 60 DD or a cummins. If you could get both doors open and hold them open i think it would be better than a jake brake on a mack. Hope that all makes sense maybe not exspaining it right. glenn

I have seen that set up and seems like i installed one on a KW and now that i think about it i remember that i had to weld the brackets to the top leaf on the spring and i called the spring shop here in tulsa and he give me some rod to weld the bracket to the leaf and told me not to worry about it because the weld was not across the leaf. Noe that was back before air ride so any thing defferent was better than spring and the old man that we installed this on was windy anyway but he said that it helped for sure but that bag is not realy very big so i dont know. glenn

Another photo of the same old dog

I am going to try posting some photos of my old hunting wagon glenn

just keepp on trying you can do it. I would help you but i cant help my self.I was going to post some my self but may not cant do.

I think you have a 6 speed trans not a 10 speed and you dont split each mainj gear. Try to start out in low and 1st gear and go up to direct and 1st gear and up to direct and 2nd gear and direct and 3rd gear and up to direct and 4th gear and direct 5th gear. glen

I can remember seeing only one mack engine do that but trhe way the compression gets to the return is licking back thru the injector line and back thru the delievery vavle in the injectiom pump and down into the barrel and plunger and back thru the return from the pump to the tank.

If you have a injector that is open or bad it could push air back into the injection pump into the return and put exhaust or compression into the tank but then you should have a noticeable miss when runing. glenn

When you get a CE light does the engine derate on power and if so then it may be a over boost code caused by the turbo wastegate not opening at the right time.The wastegate need to be calibrated to start to open at a given pressuyre or you can blow the turbo like so many macks have done in the pass. Some old timers think more boost the better but the ECM knows better and will cut back on the fuel to keep this from happening to take care of its self.The waste gate calibration is very important and cant be guessed at but done with tools of the trade. You need to look at the air hose to the wastegate acticuator and see if some one has uhooked it or pluged it because this is a common truck driver hear over the radio thing and it has been done many times and can blow a turbo. But if mack has told you what it is why not let them repair as needed. glenn

I have installed alot of pac and tec but have not seen any tec in a while and they seen to work about the same untill you get into the latter models and the jake brake may be better. The tec was some cheaper for a cummins i do remember that. glenn

Test or guess did you get that, test or guess that me you are trying on parts and hpeing but nyou need to connect a 100 psi air gage to the application line going to the relay vavle on the rear and to the front axle and check the press from the foot vavle as you posh the foot vavle pedtal down and it should be smooth as the pressure goes up.if it is ok then check the pressure to the chambers from the relay vavle at each axle and it should be smooth as you raise the foot petdal pressure and if it has a bob tail vavle in the rear relay then you will be limited untill you release the triler brakes. the antiskid or abs system will not make this problem. Late model get the blame for too many thins and the system will not cause that problem but a abs modulaion vavle that is bad can be deffective which does the same thing as the relay for the older trucks. glenn

Some people overhaul a thermodyne using the maxidyne liner only with recutting the seal ring in the head of the thermodyne head because the thermodyne liner is hard to get and it will seal the compression better. i dont know what is in the kit but it will have to have a thermodyne piston in it because thermodyne rod is smaller and the wrist pin bore is different size. glenn

You do have 15 gears but some ratios are the same so mack tells you to not use certain ratios. The ratios may not be the same but will be so close to each other that there would be no gain in going into a gear that you may be only 100 rpm different than the one you came from. Some 15 speads do have 15 true and even rpm splits i think that would be a direct drive in hi gear. glenn

That sounds like a good plan.I could have thougt of that my self but you beat me to it Rob. glenn

Rob look and find the check valve that is between the drier and #1 wet tank and is probably on the the tank. It should be a valve that has a metal ball in it and it keeps air in the wet tank when the drier unloads or as some say sneezes.That valve is still available and i have used the soft ball valve but it some times leaks if it carbons up. What hapens is if it is bad it drains the wet tank and that is where the governor gets its reading so if it sees low preaasure it will unload and the tank can drain down and hear we go again. glenn

The manual is telling you to set valves at tdc and that is telling you not to set on the exhast stocke and when it said tdc that is when the piston is at tdc but not at a perfect tdc because that cam is probley has the dynotard ground ramp in the exhaust close to the tdc and if you try to set exhaust valve at tdc you can be in the dynotard ramp and then when you get out of that the your valve will be too tight so they make another mark away from tdc then tell you to set the valves ther .I dont work on that engine but the 6 cylinders are like that and when you set the valves like you should then you can turn the engine over and check the clearance on the exhaust valve as you turn it and you will feel the engine brack ramp as it will have excess clearance at one point. hope you can under stand what i am try to tell you if not call me. glenn

the first v8 i remember was in 63. glenn

They dont h was gone when v8 cane out unless i am crazy. glenn

I put a late model engine in my b61 and then installed a air/air cooler on the front and it makes big difference in HP but the trouble with a B61 is you can get enough air across the rad. because you cant get rid of it under the hood because ever thing is so tight to the engine and trans so i lifted the cab 3" and move ahead 3" and installed a fan clutch that used a bigger fan that would pull more air. The bmodel fan would not pull enough air. Now the air can get out of the hood area around the back of the engine. For a toy truck it will not matter but we was pulling a trailer loaded all time and up in the co. mountains you could not stay in it untill i changed things. now you can mash on your motor allday. The fan is still too noisey to think. glenn

And using the quaw box will settle the problem of top speed if the 6 speed was used top speed would be some what slower. glenn