Straydog954

Not sure. I think I hit the quote button twice when I replied to fjh. He said maybe I could have new rings put in the engine. If I have that done how do I check liner wear?

Yah I’ve never had anybody touch anything on the engine or had anything done to the injectors and I’ve put 20k miles on it. I use Shell Rotella oil. It’s always used the same amount of oil since I’ve run it. Maybe a valve adjustment, injectors would be good.

These are the ideas that I’m looking for. All I really know how to do is change fluids and filters etc. I have self diagnosed all small problems with this truck by replies from guys like you on this website. Have never had to go to the dealer yet lol. It would be nice to figure out why I’m using oil before I just drop it off at an engine rebuild shop. I’ve read worn valve seals or valve guides as a possibility also. Maybe that would be the easiest thing to go after first?

Oh sorry I should have added more. It has a fair amount of blow by but is not puffing hard like a freight train. From what I recall oil pressure is around 15 at idle and 60 on the high end. Truck was bought used and I found a service record at Mack that truck had rods and mains done at appx 180k due to a strange noise. I see a remack sticker on one of the heads and assume maybe both have been replaced judging by the paint looking the same. I found the serial number on the block and it matches the serial number on build sheet from Mack museum so original block. Sometimes I will see blue exhaust at idle but most times it’s clear. Sometimes it will use a gallon of oil a day other times I can make several hauls and oil level does not move. Slight leak around pan, no dripping leaks. Took off turbo (reman) and took it to a shop they said it was tight and not the problem. I did notice exhaust ports seemed damp inside. On a few occasions while idling the engine was puking oil out between the turbo and exhaust pipe. Wonder if it has worn rings and liners? I really appreciate all of your help.

I have an em7-300 mechanical in a dump truck that has 470k miles and high hours 28k or more. It seems to start fairly easy in cold weather and runs nice but uses a lot of oil. Should I assume that it’s time for a rebuild? What is the easiest way for me to tell? Would taking off the heads and looking at the cylinders be a good start or is this wasting time because of the inevitable?

Ok thanks. I’m gonna go a different route. I’m always running heavy gonna find a bronze bushed setup.

Can these suspensions be converted to the bronze bushing and keep the same housings and springs or no?

Yes camelback suspension. Dealer said they did come rubber bushed in 44k idk. Frame is doubled if that says anything.

Don’t have any pics. Doesn’t have the caps like mine. Ran vin thru Mack dealer they said 44k rubber bushed. It would be used in a tandem dump. Was wondering what the major differences are in one over the other.

Hello everyone. Looking at a 44k cutoff with the rubber bushing instead of the brass. Is one as good as the other or what is the main difference? My truck has the brass / bronze whatever it is

Hello does anybody know if there is a gasket kit for this transmission and if so what is the part number? Looking to replace all external gaskets such as the covers etc. and didn’t know if I had to purchase each separately. I do have a part number for an O ring kit so far.

Hello all. Do they sell a gasket set for this transmission and if so does anybody know the part number? I have a part number for the O ring kit but looking to replace all the cover gaskets etc.

Where is the “Brain Trust” when you need ‘em ?

Hello all. I’m looking at a low mileage e7-300 from a cab over to replace a tired em7-300 in a dump truck. Both are fully mechanical. Can the maxidyne pump be taken off and placed on the e7-300 to make it an em7-300 or are the internals different? Also is there an option to turn the e7-300 into a 350 or 400 hp engine and if so what would need to be done? I understand that if I get away from the maxidyne set up I would need more gears and different rears because I have T2070 and 5:73.

How much do you want for it?

I bought it as a complete unit pto, Hyd pump and driveshaft I was going to put a 12 speed in my truck but my plans have changed. Not sure what ratio it is. Are you looking for the whole setup or just pto?

I guess that would be a tight cab for me. I barely have enough leg room in my RD

This one is 405hp but could be programmed to 395 I assume. In comparison to my em7-300 fully mechanical, how would this engine rate ? Mine starts pulling around 900 rpm. Is this a high torque at low rpm engine or does it need revs ?

Anybody have any thoughts on this engine good or bad regarding performance and reliability? It has no dpf

I can prob get you one but how would I get it to you?

Would the cab on this truck be shorter than an RD model? And if so how many inches?

Yes it is

That is exactly what it looks like. So this is the old style dash. Can the new style dash be swapped in by just unbolting it ?

1975 DM steel hood Fire tanker truck