JoeH Posted May 24 Share Posted May 24 Frame depth taper is from about 13 or 14 inches just behind the cab down to about 11 inches for the rears. Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552466 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 Don't know about other DM's but this one definitely has 2 cylinders cooking away inside the cab. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552468 Share on other sites More sharing options...
mrsmackpaul Posted May 24 Author Share Posted May 24 There isn't a lot of motor under the bonnet The chassis rails tappering up towards the bogie is something I have never seen Thanks for the photos Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552472 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 This truck is a ***** to work on the engine. I really like my MR688. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552473 Share on other sites More sharing options...
mrsmackpaul Posted May 24 Author Share Posted May 24 Dunno if this link work's or not A V8 was a option, all interesting stuff to me Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552483 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 I think there was an orange U model with a V8 being raffled off sometimes in the past 5 years. I'd love to own a V8, but not under this cab.... 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552485 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 Link works. Too blurry to read. I want this shifter knob though! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552487 Share on other sites More sharing options...
tjc transport Posted May 24 Share Posted May 24 the engine on the DM800 was under the hood with flat firewall. the DM 600 had two cylinders in the cab with the doghouse covering the engine 2 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552488 Share on other sites More sharing options...
mowerman Posted May 25 Share Posted May 25 OK, that’s what I was looking for as I mentioned I had never been in one. I thought maybe it didn’t have the doghouse which would give you a lot more legroom is probably easier to work on. Thanks for that. Happy Saturday wooHoo Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552518 Share on other sites More sharing options...
mowerman Posted May 25 Share Posted May 25 I’ve got some sort of floor panel and my DM that actually came out of a value liner mixer that rolled over somewhere around 87 Fit right in my 66 DM Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552519 Share on other sites More sharing options...
Jeff M Posted May 29 Share Posted May 29 (edited) The offset cabs were not built to improve visibility. They were like that because the nose was shorter which pushed the engine (and its doghouse) farther back into the cab, robbing footroom from the driver. Therefore, offsetting the cab meant that the driver gained back the lost footroom. However, passenger's footroom in an offset was poor. I drove many offsets (all DM's) over the years. Edited May 29 by Jeff M 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552716 Share on other sites More sharing options...
Joey Mack Posted May 29 Share Posted May 29 Well, it goes to show me that what I was told by an old timer 20+ years ago wasnt quite right.. Too funny, I cant tell you how many guys I told that the DM was offset for visibilty while backing up, because of the trucks application.. Never even gave a thought to engine position... Thanks for the info.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552717 Share on other sites More sharing options...
mechohaulic Posted May 29 Share Posted May 29 On 5/24/2024 at 5:32 PM, JoeH said: Don't know about other DM's but this one definitely has 2 cylinders cooking away inside the cab. you haven't experienced fun till you change a starter in DM600/ U model. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552720 Share on other sites More sharing options...
mechohaulic Posted May 29 Share Posted May 29 36 minutes ago, Joey Mack said: Well, it goes to show me that what I was told by an old timer 20+ years ago wasnt quite right.. Too funny, I cant tell you how many guys I told that the DM was offset for visibilty while backing up, because of the trucks application.. Never even gave a thought to engine position... Thanks for the info.. Jojo it was recently posted here the U model replaced the C model . to obtain the short wheelbase for city delivery/ longer trailers. I never thought of that or maybe I did and forgot. using the same cab for the U's/ DM600 and DM 800 was a smart move on part of Mack boys. the DM 800 I drove part-time was not only majestic looking going down the highway ; but lunch time the large front fenders made a comfortable seat while the hood became a dining room table. LOL at 6'1" I could climb in the engine compartment on the 800 and close the hood with room to spare. that DM811SX was sporting a 673. not the 864 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552721 Share on other sites More sharing options...
mowerman Posted May 31 Share Posted May 31 On 5/28/2024 at 5:57 PM, Joey Mack said: Well, it goes to show me that what I was told by an old timer 20+ years ago wasnt quite right.. Too funny, I cant tell you how many guys I told that the DM was offset for visibilty while backing up, because of the trucks application.. Never even gave a thought to engine position... Thanks for the info.. Jojo Hey Mack , salesman told me here ago. He wasn’t sure what the deal was but he heard it was visibility. I don’t know either, but that made sense to me. Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552787 Share on other sites More sharing options...
mowerman Posted May 31 Share Posted May 31 They certainly made a big splash as I mentioned 68 to 78. That’s all you would see hauling freight from New Jersey to Boston. Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552788 Share on other sites More sharing options...
glenbjackson Posted May 31 Share Posted May 31 i never owned a U and always wondered if cabs were identical with DM and R models. i do know one difference you can spot them, if the cabs off chassis and cant tell if its offset. DM or/and U( i think) .....they have passenger mirror attached to cab and not door. which is odd the brochure listed earlier shows a U cab with mirrors on the door. which would hit the air cleaner. looks like preventing you from opening door for easy ingress/egress...... mmmm odd. maybe a change after first year idk?? Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552802 Share on other sites More sharing options...
JoeH Posted May 31 Share Posted May 31 You can still tell it's an offset if the cab is off. Different firewall than an R model and the hood alignment ledge is different. I can't find where you're talking about in the brochure having passenger mirrors attached to doors, I can't imagine they even built one truck that way other than prototype. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552803 Share on other sites More sharing options...
glenbjackson Posted May 31 Share Posted May 31 (edited) On 5/24/2024 at 6:16 PM, mrsmackpaul said: Dunno if this link work's or not A V8 was a option, all interesting stuff to me Paul Page 4! Showing off the in door washer fluid reservoir has mirror attached to door..odd! Goodness that blue u looks good Edited May 31 by glenbjackson Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552812 Share on other sites More sharing options...
mowerman Posted May 31 Share Posted May 31 My passenger door doesn’t open all the way otherwise it (would) hit the breather… 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552813 Share on other sites More sharing options...
mowerman Posted May 31 Share Posted May 31 I see it what you mean it looks like it’s connected to the door it’s actually bolted to the breather on mine later years, it was connected to the roof. I actually have that picture of the turquoise one in my computer screen saver thanks for that Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552814 Share on other sites More sharing options...
Joey Mack Posted May 31 Share Posted May 31 After a hand full of clutch jobs in DM's, the first thing I do is take the right door off. And the last models made, if you had to pull the rear valve cover, and it has Jacobs engine brakes, you had to remove the right cab mount and jack the cab up to get the valve cover off. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552816 Share on other sites More sharing options...
mrsmackpaul Posted May 31 Author Share Posted May 31 The doors on the standard R model cab out here will hit the air cleaners if the stops aren't bolted on the hinges The door opening size stopped a lotta bigger drivers enjoying the Mack world Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552817 Share on other sites More sharing options...
mechohaulic Posted May 31 Share Posted May 31 8 hours ago, glenbjackson said: i never owned a U and always wondered if cabs were identical with DM and R models. i do know one difference you can spot them, if the cabs off chassis and cant tell if its offset. DM or/and U( i think) .....they have passenger mirror attached to cab and not door. which is odd the brochure listed earlier shows a U cab with mirrors on the door. which would hit the air cleaner. looks like preventing you from opening door for easy ingress/egress...... mmmm odd. maybe a change after first year idk?? It's an optical illusion the mirrors DON"T mount to the door on passenger side. the mirrors mount to the air cleaner tube and the air cleaner tube has a V bracket on top which mounts to the rain gutter area of cab. looking at pictures appears to be one brace assembly= it is not. passenger doors on U/DM's don't ; never did open fully. and YES it was: is a PIA to access engine or interior from passenger side. would be great to hear from U/ Dm owners having right hand drive units. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552824 Share on other sites More sharing options...
Terry T Posted May 31 Share Posted May 31 Another difference in the cab is the recess in the left rocker on a U (and I assume the DM) that the R does not have. Sorry, the best pics that I have of each model in my collection. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74171-u-and-dm/page/3/#findComment-552840 Share on other sites More sharing options...
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