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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.

Id keep on drivin its likly the orings are bad on the injector did you pull the injetcors when you did the job?

[quote I\'m not so sure now. I liked it a whole lot better when I could overhaul one on the side of the road. ME TOO! You just do the best with what is put on your plate like it or not!I have noticed with theses engines after the inital programing issues were delt with the most comon failures are physical and mechcanical some, Very illusive in nature. Only experiance will tell ya the answer quickly what is wrong ,and sum times that don\'t even work. Below is the tool we use to check THE WHOLE engine for boost / exhast leaks and other wierd and wonderfull failers ,turbos passing exhast gas into the base boost bypass valve failers egr coolers leaking into coolant all can be tested in one operation with this tool on ANYONES engine for the most part, we built this as I said before ,doing the best with what we had avilable. we use it almost daily.

Guys ya can pretty much go with the simple stuff to a point on these engines but then you get thrown a curve ball EGR.Adds a new dimension to the fuel air theroy.Heat, boost preasure exhast preasure inlet air temp humity exhast leaks,yada yada,Not a simple engine anymore, sensors have targets to meet if they don't meet the targets they don't run right. there anit nothing simple about this problem, to many added features to monitor.Its not just as simple as air vs fuel these days.

First guess egr valve is sticking Second guess did they check the boost bypass valve gone haywire? 3 EGR cooler plugged.

OR a flat cam lobe!

I had a pm from mackcl96 asking if rear wheel horse power was the advertised HP for mack trucks at one time! I accidently deleted your pm brother sorry!Anyway My answer and I will stand corrected but to the best of my memory The fly wheel horse power was the advertised HP of the truck It would be a unfair and hard to compair against other vendors engines otherwise! Having said that for quite some time duing the 80s and early 90s all the trucks came with a dynotested tag in the window Its anyones guess if they actually draged full HP out of them on the dyno before sending the trucks out!I do know also we had the odd customer take em to task on the HP of the odd V8 bitching about no power to find the 500 hp engine would be making 488 /470 to the ground which aint to shabby for an un touched engine.The guys at the dyno place also comented that you could put a cup of coffee on the hood while dynoing and it wouldnt budge where other engines would shake the dam thing off the hood!

ys its the t looking fitting at the end of the fuel pump with the small line an one larger line on it.

What your discribing sounds correct for an american bosch pump. His pump is robert bosch.Maxville has the drill for that! I.d be curious if the truck is a six speed or other econodyne does not sound right for 237.also if while pulling under load you still see smoke if so it may be leaking boost!The older engines had a stamped metal intake that could split and leak!

Could you varify which fuel system you have rob bosch or american bosch?

We only sold a few of these but fom what I remember the jake was on one seting and both on the other.

Low operates jake only! hi operates jake and stealth.if you want it to work properly the steath needs to be there!

stealth is a jake/ exshast combo They usually work well when both are workng!Can you hear the jake working? can you feel a diffrence between hi an low setting?

Beer can will work too! Shim material is good as well Never had that problem with the joined gasket!