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fordguyhey

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Posts posted by fordguyhey

  1. My 1964 711 has been turbocharged since April, 1966. It was a retrofit from Mack to keep the valves from burning in the heads by pushing more air into them. The byproduct of this was more power. My grandpa had purchased three B61's with 711 engines and not one ran 100,000 miles before needing the valves done because of burning. These trucks were also retrofitted with turbocharging and supposedly they were good trucks afterward. This is as I remember grandpa telling it many years ago.

    I don't have a boost gauge in either this B61, or my B67, but I'd bet pressure build was slight.

    Rob

    Well that puts the nail in the coffin as far as I'm concerned. Now I absolutely have to do it. So, again, if anyone has the necessary parts for sale, please let me know.

    -Ryan

  2. Does anyone know of a good turbo and manifolds for a 711? I know it's probably not worth it, but I've got a B-61 10 wheel dump truck with an awesome running 711 in it. I know they're prone to blowing head gaskets, but I still want to try. The motor i've got is the later model with more head bolts so maybe it will last a little while...

  3. I see two problems. The front mount on a B73 was a trunion mount meaning it was a rap around the center trunion that some old cummins had around the crank on the front cover. I have seen these mounts up later on 855 engines but have never seen one on a big cam. The best thing is use the front mount from a big cam and build your cross member that it sets on. The other thing is the flywheel and clutch will be a pull type if using the old mack trans.The flywheel from a 220 will not be same as a 855 engine.

    I see what you're saying about the mount. I guess I'll just fabricate off of whatever is on the big cam. As far as the pull clutch goes I've already got a swinging pedal and cable assembly out of an R model installed in my cab so I'll just need some bracketry underneath to support the cable and I should be all set.

  4. As a follow-up - talk to Kevin All at All Macks.

    Not only does he know everything, but he actually built one of these B-73's with an 855 Cummins a few years back.

    Paul VS

    Did all B-73s have Cummins motors or just some of them? I was under the understanding that the only major difference between a B-75 and a B-73 was the engine. I will call Kevin and pick his brain about it too.

  5. hey everyone. I have the opportunity to buy a 400 Cummins for a good price and was thinking about putting it in my B75. Does anyone know if I would need to get motor mounts out of a B73 with a cummins in it in order to make this work. Is there anything else that would make this a problem?

    -Ryan

  6. That's the transmission I want to put in my truck. Right now I've got a TRQ7210 in my B75 but its single disc. I'm going to be making the truck tandem axle and putting in a 285 maxidyne so I'd really like to have a double disc clutch.

  7. you should be able to see what is left of your clutch brake when you take down the inspection cover at the bottom of the bellhousing. If there is still brake material left on the brake disk, all you have to do is adjust the clutch fork so that it travels farther. Usually on Macks you adjust the fork at the top of the bellcrank that the clutch cable connects to on the side of the transmission. Once you've got it adjusted so that you can feel the brake engage when the pedal is about an inch off the floor, all you have to do is make sure you have freeplay in the clutch pedal. If you don't have enough, you adjust freeplay on the clutch pressure plate. If your clutch brake is completely wiped out you can replace it without pulling the transmission. You will have to carefully cut off the old one (I've done it with a torch, but it's not a lot of fun!) and you can replace it with a two piece clutch brake that wraps around the pilot shaft and pins together.

  8. im asking around if any body has gotten rid of the 24 volt solenoid and made their truck a 12 volt start system and what you have to do to make it all work.this truck is a ground up resto in progress and a brand new harness is on its way so anything can be done to get rid of this switch. any help i s greatly appreciated.

    Hi, I was just reading through some of these older posts and saw that you said you had a new harness coming. Just wondering where you got it from? I saw that new ones cost over 1,300 at Watt's and I figured I would attempt to make a new harness myself for that price.

    -Ryan

  9. I was looking at the pictures of Matt Pfahl's B-61, and saw that he had put a superliner front axle under his truck. I am planning on putting my B-75 cab on a running R model frame that I have, but I was doing some measuring and the only thing holding me back from tearing into the project at the moment is the fact that the R model front axle is 6 inches wider than the b model axle. I don't want the tires to stick out past the fenders. I noticed on a B61 that I have together with the fenders on it still that the tire sit just inside the fenders. This makes me think that it might just mean that my tires will be even with the fenders if the R model front axle is used. Unless a superliner front axle is narrower??? As always I appreciate any and all input.

  10. A .69 overdrive in the 7210 vs a .70 overdrive in the 7220, and a couple of other miniscule differences in ratios of various other gears.

    You can't tell any difference in the way it shifts compared to a 7220.

    I had a TRQ 7210 in that B613T with the turbo 711 that I made into a dump truck in 1981, and the company I worked for back when I was a teenager had a B61 10 wheeler dump truck with a TRQ7210.

    .

    Also, Mack calls the TRQ7210 a 14 speed and the TRQ7220 an 18 speed although they are both shifted the same way.

  11. Cant see why it wouldnt work, an old timer years ago in buffalo switched his B53 truck to a r model cab and hood, the truck just sold after his death for $ 4000, truck was still road worthy.

    Green Giant2

    The other problem I might have to deal with is that I want to do this with a B75. The only B models I've heard of on R model frames are short nose trucks like B61 style. The B75 is like 9 inches longer in the nose so I'm going to be doing some careful measuring this weekend.

  12. I was curious if anyone has ever seen a B model cab put on an R model frame? I'm in the process of making my B75 tandem and I've picked up an R model for all the donor parts. People keep telling me I should just put the B model cab on the R model frame that is already tandem. I haven't done any measuring yet, but I'm really curious if it's even possible without tons of fabrication. Me personally, I would rather keep the B model frame under the B model, just wondering what everybody else thinks.

  13. I'm putting together a B75T and I really want to make it a tandem truck. I have the opportunity to buy a set of 38k rears with 4.17:1 gears at a decent price. I also have an older 285/237 maxidyne with TRQ7210 quadbox in the truck. I'm wondering if anyone else has run a setup similar to this. I know I won't be using overdrive very often with those gears, but I'm also wondering if I'll be frying the clutch trying to get moving on the low end. Its not very nice for the tranny to shift from 1stLL to 1stLo split because the jump is huge, I've done it in other B models but I don't think I want to be doing it every time.

  14. Two more photos, hope they help. I can relay the question, but unfortunately, these two guys "in the know" would rather break a 10.00X20 tire than to be on a computer...

    The setup works just fine, pulling a 16,000 lb. camper for years.

    th_IMG_1425t.jpg

    (click to enlarge)

    th_IMG_1422t.jpg

    [/quote

    Hi, is there any way you could find out for me if that B75 in the picture has a factory power steering column for that shepherd box or is the column out of something else?

  15. I have two B75s. One that had a 711 in it that I took out, and another one that I got for parts that had an ENDT676 in it. The one that had the 676 in it didn't have power steering but did have spin on oil filters, they were just short ones from NAPA, as far as I know the truck was owned and operated by Don Orall's Garage and was a wrecker spending a lot of time on the New York State thruway. From what I know about the truck, it worked for years without any issues from oil filters. I plan on using the motor in the B75 that I'm putting together and hopefully before I put it in, I'll have a power steering box too.

  16. I am currently wrestling with the exact same issue - trying to decide what is the best way to get power steering in my B-73. I have found a few suggestions:

    There are a number of newer power steering boxes that supposedly retrofit fairly easily using the original steering column with modifications to the end for attachment to the steering unit.

    Air assist is available. No modifications to the column necessary. (Hydraulic assist may be available, I just haven't found it, but I am going to go looking)

    Radial steer axle tires and a good front axle rebuild and/or service will take a lot of the effort out of your manual steering, such that it may be acceptable, too. Especially with some weight on the rear axle to lighten the front end a little bit.

    Good Luck.

    Paul Van Scott

    Having driven a truck with air assist, I don't even consider that a real option. It seems like you crank the wheel around a couple times and the buzzer is on. I bought a B-61 the other day that has hydraulic assist with the cylinder on the tie rod, and I was actually impressed at how that steered. I think that may be my easiest way out.

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