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Yes, valve covers off you need a 5/16 fine bolt to pull them up and a 15 mm socket and 6 inch extention to pull the plug that holds them in! and the injection line has to be out.

You need to reseal the injectors!Buy 6 oring kits and do em all!

In most cases I''d tend to agree with you hk but if I read right ,its jumping out of gear as well ,a rear end problem would not cause it to do this. I have seen the tail shaft snap ring come off and cause the split not to work properly.

Did you pull the drain plug and see of there are hunks coming out of it? Usually the first thing you need do on a 12 speed with noise problems! the next thing is pull the side covers on both diffs and check the drain plugs there as well!You have already locked the power divider out so thats confirmed! Before pulling the trans pull the side BIG pto cover and look inside check to see that the split is operating corectly and going all the way in!

Oil preasure / coolant overheat and low coolant set the lights off on a 97!If you have the inactive codes check that will tell the tail.

agreed replace the shaft!

Are you working on a VMac engine?If so the timing is controled by the computer!

Good man ,Remember , if it dont run a good as it did before you may have to have the turbo recalibrated by the dealer ,Also talk nice to that guy that your buying the parts from and he may be able to pull some strings in the service dept to help ya along with that part of it!It takes 5 to ten minutes to do and the engine needs to be warmed up to at least 160 deg! The puter needs to measure the stroke of the new turbo to be able to adjust the vanes to the right angle to run correctly.

NO Bro you need to buy the right turbo ,the boost sensor idea was aimed at the wastgated turbo,You thru me a curve ball with the turbo bolting to the manifold thing, the vgt turbo is a total diffrent ballgame It needs the acuator control signals and wheel speed sensory in puts to know where to position the vains or the puter will pull in the leash Just the way it is. You cant fight city hall.pop the 3000 or 5000 on the turbo while your at it there is an update for the exhast studs and gaskets that just may work this time replace the exhast gaskets and fuel lines and start over When you replace the turbo it needs to get calibrated as well!There are places rebuilding these turbos now as well for a fair dollar less Than the dealers sell mack ones. The only way to make what your tring to do work is to rip all the rubbish of the engine convert it to the older style engine wireing and computer the whole nine yards! Don't waste money on the impossible!

I would love to see a picture of this turbo!The mounting flange is a tad diffrent on vgt style turbo! Doubt it would even fit.If you have a waste gated turbo and you have replaced it with a standard turbo the result is the same if the engine sees any more than 33 psi boost it will derate!In this case you (MAY) be able to remove the sensor from the manifold and plug the hole and install the boost sensor in a plastic bag on the fire wall so the puter never sees the boost! down side is your boost gauge wont work!Put in a real gauge

I beleive this button enbles you to override a low oil or high temp auto shut down to get the truck off the road.

75/09 for the diffs synth OK the tran 50 w synth no problem with either change over.

this update has already been installed loses more oil at higher speed about three gallons if you get over 65mph Jake or power leash!If jake remove valve covers and check to see if the plugs havent come out of the rocker shafts If leash I would lean towards the turbo Again.Turbos can build preasure on the exhast side causing exsess blow by puting preasure in the base and blowing the oil out where ever it can. Sorry I put the pics in the wrong post. Boost /turbo test tool! We use this tool to check for problems like yours it requires you remove the exhast the inlet pipes and the turbo drain tube to check for the problem you are haveing and apply 30-40 psi air to it!If the turbo passes air thru the turbo drain there inlies your problem if you hear air coming up from the base still you have other problems ie: rings or valve guides! Just something else to think on! Please post your Fixes for others to see! It makes the fourm more useful and It benefits everyone! Fred :\Documents and Settings\Laura\My Documents\My Pictures\turbo

i have 2003 mack 427 dump truck i have spent about 8000 dollars try to find why oil is coming from my blow by tube i know sounds easy turbo replaced twice new air compressor new rings had all the upadates could there be somthing with this motor different. i am really out of options. help How much oil! ? Do you have the valve cover breather kit installed? Below is the tool we use to check turbos and boost leaks.

Check your pms!

Yes 3/8 line You are checking the diphram for leaks if it has a hole in it, it will not push the fuel stop out of the way when the boost comes up and it wll lack power and give you the conition you have.

Ken I don't know if you got my pm so heres another place to head The proceeder is simular to if not Identical to the 5.9 cummins turn up! here One thing to check before you do anything is to suck on the hose that goes to the lda at the top rear and seeif it holds vacuam if it does your good to continue on with directions. http://www.tstproducts.com/INSRUCT98.pdf

Lower that what? typicly you will see 10 to 20 psi boost in brake mode depending on rpms!

What your seeing is normal operation for the AI engine, There is a fix but it aint legal!

I have see the sensor mount rot off on the rear wheel sensors!Pull the wheels and drums and have a look if they are out board drums!

They really have no business tring to sell it as a collector or rare ,it has been to comprimised by engine swaps.

Make sure you have the outer cylinder in corectly the snapring towards the rear!just pull the cylinder off in the truck and check it! also disconect the touque limit line from the reversing relay at the engine and plug it! both ways!

Three things starting with the cheap and easy!Thermastat replace it. does it have a thermatic or air fan does it operate correctly? Rad is it clean?and one more thing if it has shutters are they opening?

Yup I agree totally with you Glen and Rob , another thing can happen too is a guy can create a leak by tring to do a repair those hoses tend to get stuck to the tubes and leave remnance on the tube which can cause leakes after reasembly. ,another question always asked Why did the job take so long is a comon question!The answer is I DID SOMTHING I REPAIRED the problem didnt write a novel on how too! Not to toot our own horn but that is why we built the boost plates in the picture I tests the Whole engine charge air system. that leak would have showed it self in an instant and probably more of them!another fairly comon leak on these engines is the inlet and exshast gaskets. Anyway , Glad it was an easy fix for ya! Anyway talk to the service people if they don't credit you back somthing get eaven!

That happens lots ,once lines are disturbed the injector orings will leak.