jake

steel nose, This past winter we did just that. My B 61 had a bad 711 so we installed a 673C. It also had a rotery pump and I wanted to keep the APE. We had to get timing gears out of a 673 with an APE pump because the rotery pump drives off a different gear and the 711 gears would not mount in the 673 engine. Also there was not enough room for the APE pump unless you have the air compressor with the long mount. If you have to change to the longer mount compressor, you then have to change to the longer assessory drive shaft. Also the pumps lubricate differently so make sure the pump receives and drains oil correctly. When we first started the engine it leaked oil badly at the mounting flange. After removing the pump three times we discovered the hole in the block that the rear pump support bolts to was different on the two engines and was not allowing the pump to bolt up flush. we had to rework the support leg. Many times I asked myself while doing this, why didn't I just keep the rotery pump? Good luck! Jake

Well we made it back from Huntsville without to much trouble but I haven't had much time to do anything with the L model. Idid get some parts ordered for the engine fan and am waiting for them. I find your information on your L very interesting and am going to have to contact the museum real soon. Idid take a few more pictures and will try to get them up here if I can remember how I did it! Jakebrake

I'll get more pictures on here when (if) we get back. We're leaving for Huntsville this morning with the B61. I'm still looking for information on the L T model or if some one knows of a book on them I would like to find one. I plan on contacting the Mack Museum too when we get back. They was a big help with the B model. Thanks. Jakebrake

Thanks Superdog. That's the plan to leave it just as is. I may get rid of the headache rack. that thing is ugly. Other than that it needs the belt tightener on the Cummins fixed and one spring leaf replaced in the camel back Also it needs both door glass replaced along with new channel. It's really fun to drive. It has air assist stearing, 5x4 tranny, and a jake. Also has a pto with awet kit. I was told the guy that bought it new drove it until 1994. She came from Montana. Wish she could talk. Jakebrake

This week the L T was deliverd that I bought and to my suprise it was an LTL. I bought it from a picture and from the looks I thouht it was an LTH. I didn't even know what year it was but the title says '53. It has a 335 Cummins which is not original but it runs like a top. Now my B61 has a big brother in the shed.

My brother And I are going. Have bin working on the B model since last June. Replaced the triplex, replaced the thermodyne, have some new glass in the cab,new batteries in the box, redone the radiator, and will either rebuild the generator or will install an alternator. It's about 1000 miles fron Wisconsin and we plan to take our time and stay all week. I need to thank a few people on this forum for the help I have gotten. Namely Herb and Glenn. Herb told me where I could find a transmisson and Glenn answered many questions on the engine.I bought some parts from Kevin All and had to call Matt Pfahl a couple times. Thanks guys. You can't beat MACK guys. The old B model won't be all done but like I have bin sayin, " It's better than it wuz!"

I was wondering if some one could provide some information on the L T model. I went back through the forum but didn't find much on them. I have a chance to buy one that is Cummins powered but I don't know much about them. Many years ago I drove an L J but this truck is much bigger. Were they built in California instead of Pa? Thanks. Jakebrake

glenn, My 711 ran good but it leaked antifreeze in the oil. Ithought it was head gaskets but when I tore it down I found some small cracks above the cam shaft and behind the valve lifter above #2 main. Sitting over winter it would leak about a pint in the oil. I would always drain it off at the oil plug before I would run it but what a pain. Between my son and myself we got 4 1/2 B53 s.( one is cut off right behind the cab.) All have 673 s. None have oil coolers. Three have turbos. All have the starters on the top left side. Two are BCRs with B53 serial number plates. The engine from the 1/2 truck is going in my B61. jake