mrsmackpaul

12v71 welcome to the forum Dunno if Macks had a 12v71but a few KW's did out here Paul

So how would a mechanic road test a manual transmission if they can't drive it ???

I think most people out side of the find it amazing that a lot of Americans cant drive a manual at all and it appears a lot of Americans fear the very thought of driving them Paul

I jave only ever seen bonnetted (conventional for yanks) ones out here Read the other day only 33 made it out here in total so the fact I see any at all is amazing Paul

How could a bent crank effect the timing??? The cam is driven off the front of the crank so even if the crank was bent it would have effect on the cam posistion to the crank , so it would have no effect on timing Paul

It's a funny thing how attached we become to things Paul

I doubt it will be the cam grind , diesels arent as susceptible to cam shaft grinds as petrol But you are saying there is a sensor driven from the cam ? perhaps thats a place to start Perhaps these newer motors are cam sensitve and the cam isnt the right one or installed right Think about it this way , if the timing is out two tenths of sweet stuff all then the sensor will be out of time with the crank and the injectors will be out of time with crank and the cam sensor As I have said already, I would dial in the cam like I would have as young bloke chucking a hot cam in a car motor, not just make sure its timing marks are lined up but make sure the lobes are rising and falling in the correct position to the crank and to the sensor I would also make sure the crank sensor reads at the correct time and matches the timing of the cam sensor This is what I would do, I doubt most young blokes would even know what Im talking about at any truck dealers so I would think this is something I would do at home over a weekend I think you also find most people in modern work shops have little to no idea on fault findint and rely on work shop manuals and what the lap top says and anything unusual just gets guessed at not thought out Just some thoughts Paul

Thats a whole lot of get up and go in very tidy package in the 12 pot Cobra Very very cool indeed Paul

So this all started after the cam was changed I'm pretty sure you said a few pages ago And since then in a attempt to fix the problem caused by someone changing a cam there has been just about everything else changed from the front to back the back of the truck If it was mine I would be looking at the timing and all of this stuff that is driven from the timing I find this almost impossible to believe that this has gone on for this long without people going back to when the problem started and finding the stuff up back then Paul

It was less than a 100 Im reckon I read some where They are a mob on the Hume hwy around Cambell Field Melbourne , cant think of the name now They were a major engine rebuilder and gear box mob and all manor of truck parts and wrecking as well Not to be confused with the mob in Perth also doing DiamondReos as well around the same time

Yeah I um dunno about this one , good luck with it I guess If you click on the link it goes on about dealer network and parts availability etc I aint seen no Diamond Reo signs about ? Paul

Were do these injectors get the signal from on the motor of when to fire ? There must be a sensor that picks up the position of the crank, were and what is it ? Paul

Hang on I must be realy thick , if it vibrates when its in neutral and the truck sitting still it eliminates all the rest on the Swish mans list And as I recall this only became real bad after a fresh cam was installed There is some major hints as to were to look Dunno much about these modern motors but the cam drives the injector pump on older motors If the cam is out a poofteenth it means the injector pump is out So I would dial um the cam just to check it I would then spill time the pump tomake sure its fine and accurate as well Ans lastly make sure the injector lines are still going to the correct injectors But if it's some flash common rail jigger you might wanna forget all of the above lol Paul

No the cracks are fairly common Looks like the oil is coming from much higher up looking at the trunnions Paul

In this wide brown land there are 3 topics that are frowned upon been discussed Or at least there was 3, things are changing in recent years Politics ,money and religion All three start fights always have, always will I believe this is because we believe everyone can believe what ever they want as it doesnt effect everyone else, do what you want And as for money, it should never be spoken of as you never know how someone else is going Thats the free country I live in and come from Very different from the US But I dont have a problem with people talking these things on here as it is a US based forum But be aware there is nothing to stop people from other parts of the world with vastly different views than the US starting to talk about things as well Paul

There is a facebook page on this book Paul

Mate need a better photo of back row you are referring to Paul

Nope never heard of it but might make mension for my Chrissy stocking this year Paul

That was a grew read, I cant imagine young men doing this today Paul

Looks very sharp

I tried a tig when I did all the body work on Mrs Mack but soon gave it the ass and replaced it with a mig and .6 wire and can weld up panels with little to no distortion not a problem And considering I had never used a mig before I thought this was pretty good I have only ever been a stick welding man until then and still prefer stick welding to mig but its growing on me but the tig has been retired after a couple of days LOL Paul

Have a great trip

I bought a porta power some years ago and wonder how I ever managed with out one Paul

What a lot of people don't understand is that timing is critical for diesel and timing to each cylinder is even more critical Injector lines cant be shortened at all and if a diesel miss fires on one cylinder even a tiny bit it will mean that the motor is out of balance How much is needed to out of balance will depend on the injector line length As little as a few months ago I a injector line broke on the way into Dubbo (town in western NSW) the young pimple faced mechanic at the Mack dealer say's "just crimp it off" I tried to explain you cant , he wouldnt listen so in the end I trimed a little out and joing the line with some air line fittings to get me going Im sure we have all heard stories about motors running on 5 instead of 6 or 7instead of 8 for years with no drama , when pressed about these yarns they turn out to be bull, a motor will vibrate it self apart I am not a trained mechanic at all but I make it my business to know whats going on and to know how long things should take as it all costs me money and it doesnt grow on trees were Im from Something is wrong that no one else has looked at yet, all anyone has done is fix the symptom Like going to the doctor with your finger half hanging off and you say "I'm leaking blood" the doctor says just put some pressure on it , all good the blood stops but you question as to why when you take the pressure off it starts leaking again and no one bothers to put a stitch or two in to fix the problem You need to go back to basics and confirm everything is right at the very start of when this problem began, trouble is no mechanic is gunna want to touch this mess now after every other person has had their fonger in the pie I dont know about the US but out here there are very few mechanics left just people that change things over because they are told by the computer or forman Or buy your self some tools and a couple of workshop manuals and fix it your self, even if it takes months it wont matter because its been off the road for months now and cant do no worse than whats already been done Paul

I have been reading this thread on and off for some time Are you sure the timing is right between injector pump cam and crank Has anyone dialed it in just to see ?? One thing for sure it isnt anything that has been tried so far as most things have been done a few times now and still no difference except the bank balance is a lot lighter Always go back to basics, something has had to have changed to start this and yet no one is really looking just changing stuff hoping to fix the problem There is a very good reason I fix all my own things and rarely pay anyone, I might stuff up but I will admit it and not bull shit my self and I also know what has been left and missed I rebuild truck and tractor transmissions motors and and final drives, I rebuild final drives and the like and rarely change every bearing, shaft or gears and my old buckets will work on full power all day and not let me down I make plenty of mistakes but I learn from them I would have bought my own tools long ago and maybe still not have fixed it but would have a far better understanding of whats what just saying Paul