SuperB

I fabricated the bracket I needed. This will work and position the brake handle where it was originally, and I'll just keep an eye out for an original bracket. Thanks for the help guys

Thanks for the picture Steve. What model truck was that brake in? The shifter handle looks like it's a little longer than the one from my truck.

I agree with what you said there Larry. I kind of think Mack just finally decided at some point to use the same case covers for all transmissions, duplex, triplex and quad, since it would work for all 3. They probably just revised the brake mounting bracket for when the cover was used on a duplex. I'm pretty sure those two bolt bosses on the side of the compound shifter housing in your picture is how the handbrake is mounted on the triplex and quad. The rear bolt boss even sticks out further to create the correct mechanism angle that my original one has when it's bolted on. I feel confident now that I can go ahead and install the transmission knowing this case cover is the right one and won't have to come back off. Hopefully I'll be able to find the right brake mount for this transmission, and just make my old one work for now. Thanks guys

Thanks for the replies. The greasy thing is the early TRD-72 duplex that I have the handbrake from. It attaches with the 4 backed-out bolts. The 3rd picture is the TRDL-722 duplex. It's the exact transmission the truck originally came with, but I don't understand the difference in the case covers. This cover looks like a TRT triplex cover without the small compound shifter box installed. I think the handbrake on a triplex would attach to the side of that shifter box, but i'm not 100% positive

According to the build sheet for my '65 truck, it came with a handbrake arrangement. Also, the transmission I'm putting in had the brake drum assembly on it when I bought it. That's all I have to go on though, unfortunately. I don't have any parts diagrams for my particular truck/transmission.

Hello everyone. I'm trying to figure if there was more than one style top cover used on the duplex 10-speed transmissions, and I was hoping someone could help. I just removed the older model duplex from my truck. I think it's a late 50's and it's a TRD-72. I have the correct year and type transmission for my truck all ready to be put in, and ran into a problem. This transmission is a 1965 TRDL-722 aluminum 10-speed. The issue is that the hand brake mounting is different between the two. In trying to figure it out, it looks like my 1965 transmission actually has the triplex style top cover even though the transmission's part number is right for my '65 B61. Its has the provisions for attaching the small triplex shifter box/housing on the driver's side. I guess that doesn't necessarily mean this cover is wrong for my truck, but it would require a different hand brake mounting bracket than what the TRD hand brake has. Any help in figuring this out would be really appreciated, I don't have any info on this in any of my books or manuals, and I can't find any pics online either. Thanks in advance

I'm looking for a hand brake mechanism and mounting bracket for a 1965 B model Duplex transmission. It might have to be from an aluminum case transmission though (TRDL-722). I have a brake mech from an earlier cast iron case transmission (TRD-72), and it has a different mounting arrangement, so it does not fit on the aluminum transmission for my truck. The one I need looks like it mounts using 2 studs that are right next to the main shifter attaching bolts, and also uses 2 horizontal bolts that go into the side of the transmission cover down near the gasket surface. I'm guessing at this, because I can't find a diagram for my transmission. I can try to post a picture if my description isn't clear. Please message me if you might be able to help. Thanks

I'm rebuilding the normally aspirated 711 engine in my B61, and have found some concerning stuff. The rim around the bowl on all 6 pistons have small cracks in them, and the tops of several pistons are glazed. It looks to me that they've gotten really hot at some point. The engine is original and it's just a hobby truck now. The engine ran fairly well, but had some issues I wanted to fix. It has had one head, one connecting rod, and 2 pistons replaced at some point in the past, and the engine looks like it's been together for a long time since the last rebuild. I checked the pump initial timing before disassembly, and it was 29 deg (I think 28 is the original spec). I checked the timing and duration (full throttle) for each cylinder in the pump, and they all looked very good to me. This engine has the syncrovance. Oil pressure was always very good, and crank end play is good, so I'm not taking the crank out. I will be putting in new pistons, rings, rod bearings, and heads. Liners are good. I have not had the injectors tested yet, but I will be getting that done also. Does anyone have any thoughts on the issues with the pistons that were in it? I've heard that these engines had high cylinder temperatures when they were new that caused head and valve problems, but I don't know if those issues would be anything I would have to worry about just playing around taking it to shows. Oh, and it has the original oil bath air cleaner on it. I plan on putting a pyrometer on it just to keep an eye on things. Maybe what I've found is no big deal and was common for these things back in the day from hard use (this truck was used to pull a water tanker I believe), but if the timing needs to be changed or something, I'd appreciate any guidance or advice you guys can give me. Thanks in advance for any help!

I was able to find what I needed. Thanks

I'm in need of a rear main seal retainer for an E6 engine, the style with the rubber lip seal. Thanks in advance for any help.

Hello, I'm looking for the panel that bolts on the front of the flywheel cover (bell housing) on a B model with a 711 or 673 engine. It's about 12" long and covers the large bell housing opening near the rear of the engine oil pan. It attaches with two 3/8" bolts. Thanks in advance for any help.

Thanks guys. I'm still not quite sure what applies to my 711 though. Here's a table for 673's in my Operation and Maintenance manual.... Here's a table in the back of that same manual for 673P's specifically. It seems like there are different numbers for each pump on each engine. It's unbelievable how difficult it is to find anything specific to the mid 60's END711. My pump number has a P8 suffix, but I can't even find a 673 spec for a "P8" pump. Maybe the Mack Museum like was suggested earlier? It looks like they stopped giving this info in the Mack repair manuals, like Steve said above.

Thanks JoJo, the engine and pump info is in my first post, except that it's in a B61. Also, it's an ENDL engine, if that helps. Hopefully it'll be in your books. None of the TS442 repair manuals I have list it, but I don't have the earliest edition.

Thanks for the replies. We must have the same O&M manual, because those 673P specs are the closest ones I can find too. I didn't think that the museum might be able to help, maybe I'll reach out to them.

Would anyone happen to have the rack setting specs for the injection pump on my truck? None of the manuals I have list mine. 1965 711 engine American Bosch APE6BB-90Q-5069B8 Mack 313GC4135AP8 Thanks for any help

Yeah, that's what I was afraid of. I'll plan on having to take them out in pieces. Thanks for the help BTW, it's an END711

I have several leaking threaded block plugs (freeze plugs) that I'd like to replace the o-rings on. Just wondering how big of a headache it typically is to get them out? Are the block threads usually ok? I think I have the right 1/2" drive socket for them, but when I tried to remove one out of a head it won't be re-using, it wouldn't budge. I'm assuming they're right-hand threads. Hopefully I won't have to cut them out or something. Any words of wisdom would be greatly appreciated.

I think what you're looking for is for sale on eBay now. It looks like the one on my 711. Just search Mack B Model Oil Filter Neck 673/711

Thanks for your reply. The ones you referred to are the shorter and more common ones, 616GC116. I'm looking for 616GC156 which are about 1/2" longer. If you have any suggestions on where I could find them, I'd really appreciate it.

I'm in need of a set of 12 fuel injector studs for a 711 engine, the part number is 616GC156. These are longer than the more common ones, I think these are about 2.75" long. They have a longer wrench area than the other type. I'd be interested in new or good used. Thanks for any help.

Thanks for posting the chart. To tell you the truth, I didn't even know if the jacks that Mack provided were hydraulic or mechanical. So it looks like a B61 would have gotten an 8 or 12 ton. The build sheet lists the lug wrenches that came with the truck too, but I can't even find a picture anywhere of what those things looked like.

I was just wondering what style & brand the jacks were that came with the B model trucks? Assuming they originally came with one. Would anyone happen to know?

This reminded me of one day (at least 15 yrs ago) when I was coming home from work through Boyertown, PA. I came around a bend on the main street, and there was a truck that I think was delivering coal to one of the old row houses in town. It was a late 30's or early 40's vintage truck sitting across both lanes, and the truck bed was raised quite a ways up in the air and had a long trough that went down to I guess the basement window. I assume he was delivering coal (maybe it was wood chips?), but it was pretty cool to see that old truck still getting things done. It was probably a pretty common sight back in the day. I don't know why I didn't take a picture, probably just so surprised to see it sitting there.

Thanks for the reply. I've found a partial kit that should work and will help, but I haven't found the top cover gaskets yet. Maybe they're not available anymore.

Does anyone happen to have any suggestions on where I might try as far as locating a gasket set for a TRD-72 series duplex transmission? Watt's doesn't have access to them anymore, and I've tried a couple of the rebuilding companies and online searches with no luck. Any help would be greatly appreciated. Thanks