Lmackattack

if you think it is crank related you might try to bar the engine back and forth and see if the flywheel is moving at the same rate. if you have any slop at all. there is your issue.

I have a 12 speed still waiting to go in behind my 285 with 4.17s I think I figured it would do around 78 MPH flat on the floor

that tag tells me its a 285hp Maxidyne...

I will also make a comment about R models in general . Some were rock solid and drove as smooth as other trucks. then you had some that felt like they spent more time in the air than on the pavement. Most 6 wheeler Macks I drove were well planted to the ground and were smooth driving and running with that extra weight of the dump bed took out any engine vibrations. A superliner with air ride cab was quieter than a standard R model with air ride cab etc...My experience it was the R model tractors was that would tend to vibrate more. What im getting at is these R models all had more vibration than a modern day truck or one made of aluminum. ones opinion of a "bad" vibration may be completely normal to someone else. And without one being there to see or feel it its best to get a few opinions on it.

glad to see all the old pics Rob. Its been a while sense I have seen the old trucks you have

Rob I was under the asumption that all 300+ were of air and water charge cooled. I see yours is just air to air

that has the air and water charge cooler you can see the upper section has the water passage. here is a pic of one up close

from what I recall yes. The most common were in 285 and 315hp. however there were some very early 300 and 350 ratings with the water and air side mount cooler. I have yet to see one of these but many discussions on them coming out just before the front mount intercooling

besides putting a dial on the flywheel as suggested earlier I was going to suggest getting under the truck and watching the flywheel spin in the inspection cover while running to see if its wiggling like the crank is bent. but if your oil samples have been good that kind of rules out any bearing slop you would get with a bad crank. I know you said it has new injectors but one other test you can do fairly simple is to crack open each injector one at a time and see if the shaking goes away. I have never worked on Etec macks but if the injector is firing out of time because of a faulty ECM it can introduce a vibration. shuting down a cyl 1 at a time may be something to try as it don't cost anything. Just throwing out ideas

When the truck is parked in neutral, running... when the vibration comes on and you push in the clutch does the vibration change or go away?

A.) yes the shift pattern you show is correct. B.) that is correct c) ENDT676/676 were all maxidynes. I cant comment if the EM6 and EM7 was the note for a just a maxidyne. When they came out with the 4 valve heads most people I know just called them a E6 / E7 or maxidyne / Econodyne. someone will have to give you a solid answer on this one d) No....the 6 speed mack manual states to use Lo Lo in 1st gear only. Shift patter as follows Lo lo/ 1st, shift the compound into Direct / keeping main in 1st ,2nd,3rd,4th,5th this gives you 6 forward speeds total. that being said the wide rpm range from lo lo/first to direct /1st is most often not possible to do in the slightest bit of soft ground. you simply cant keep the road speed up and match the RPM drop when making the shift into direct. the only other option was to hold Lo lo/1st untill you reached solid pavement but sometimes that was just not practical. So most drivers like myself shifted it this way Lo Lo/ 1st, 2nd ,3rd , shift into direct ,4th , 5th. shifting this way you got your road speed up to about 10 mph before shifting out of lo into direct, I found to be one of the only way to up shift when in soft ground and the load is heavy. it never hurt any of them that I know of.

I got no issues with unions if they stick to their work and keep their nose in their own business.

I had one try and card me in Chicago. Im non union and the job was non union just me on site, I was tarping a load of debris when he walked up. No proper introduction to his name just that he was with the union and asked if I was union and if so to see my card. I said no im sorry im not part of any union so cant help you with that. He asked for my name and I said Im sorry I did not catch your name? He again did not give a name just a union name.. So I politely said ok I think were done here, The company name is on the door, if you have any more questions they can help you. I dont just give out my name to random people just as you dont feel the need to either but Im sure we both understand. I pulled the truck out to the street and walked back and asked again that he please leave the site. He ignored and continued to talk on his cell phone. He again refused my polite but 3rd order to leave. So with him ranting on the phone. I said im closing and and locking the gate. As I started walking back to the truck he started to talk with a different tune. I Said have a great day, I will be notifying the company owner of your refusal to leave the site when asked continually. I will contact the owner of the property as well and I suggest he leave before the building owner gets involved and puts trespassing charges on him. boss later found out who he was and thru connections made sure he did no come back to bother us.... its not what you know its who you know here in the city...

yep. its a shame what the mfg were forced into and what they have force into the market.

ask if they will just put in a E7400 and be done with it. Sorry to hear of these headaches . it should no be like this for anyone.

R700?

looks upside down and backwards?

The 2Valve tip turbine engines were very reliable and easy to work on. Yes they were painted Red at one time. if you look at the top of the governor at the back of the pump you should see lock wire thru a few of the bolts. if the wire is missing then yes it was likely turned up

The 3406E cat I drove had injector cups fail and filled the coolant system with fuel. Had to drive 200 miles with fuel leaking (slowly) out of the over flow tank to get to the nearest shop that could make the repairs. When the engine is running The fuel pressure is grater than the water pressure and the fuel is pushed past the cups into the coolant passage. as soon as you shut down the hot engine the coolant can then push back into the fuel system as it has greater pressure. its a common issue on some engines.

is this a mechanical or electronic engine? I know the mechanical engines suffered from worn throttle return springs and governor issues that made the engine surge but this was only when running down the road. if its doing it when parked I would look at engine related such as flywheel,clutch, or possibly internal parts or timing issues.

if it helps I might be able to get you the other numbers off the oil temp gauges?

I had to give my local Mack dealer a superliner vin for them to look it up. this was at a old Mack dealer. not at a Volvo or a no name truck center. The parts guy went right to a old book for the original part number and then found the superseded numbers. I bought them all but the boost gauge as if I recall the mack gauge did not have numbers on the gauge to tell me how much boost I was pushing? I used a standard auto meter gauge

http://spicerparts.com/calculators/transmission-ratio-rpm-calculator

what RPM does it turn? at 65mph? I ask because at 1800RPM with a T2090 9 speed (.71 overdrive) and 4.64 rears on 11R 22.5 tires (41.5" tall) you will be at 67mph. If you run it at 2100 your top speed is now 79mph. Does the truck have Macks "low RPM" motor? it may just need a pump RPM adjustment to get the road speed up.

you do know that the UPRR is returning a BIg Boy back to service? #4014 that was pulled out of a park in California is now in the UP shops and under rebuild