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In my opinion Do a proper lab oil test! Correct me if I am wrong however this problem existed prior to the rebuild and directly after ! that in my mind kind of rules out fuel dilution! Worth a look thou leave no stone unturned cheap and easy! The gear slipping would follow along un detected! That said the oil sample should also pick up on some metal in the oil from a slip! No disrespect intended In my comment ! The halo test is fine if you strongly suspect dilution or coolant ! cardboard will pu on coolant these however won't pu on metal! hence the lab test comment! This here issue if it exists is one of those if it isn't broke don't fixit things the E6- E7 motor had no issues with the accessory shaft till they moved the PS pump to the front It all starts there!😬 this all started when they started morphing the E6-4V to the E7 !

The EGR Valve is operated by oil pressure! This is lily why you have blu smoke! My thought here after reading this whole thread over a couple of times! (One) Take the pump down Make dam sure the pump is correct is the high volume pump! (Two ) I have seen the accessory drive shafts break I don't remember if its is welded to the shaft or not but the accessory shaft on some of the older stuff was bolted Is it possible that the pump drive is slipping on the accessory shaft?? that question is for Joey as I don't remember my self! If you don't resolve this by normal means I suggest you need to shim that relief valve Because the oil pressure needs to be higher just to run correctly ! Double check the pump Numbers Mackpro Got the where with all, to do this I believe ! You may want to check the accessory drive Bolt for tightness its behind the PS pump on the front 300 Ft pounds I believe ! Everything we choose to do from here on is A shot in the dark Sounds to me you have checked and double checked all the normal stuff! Just my opinion!

What was the reading on the manual gauge?Please?

Yup another company swallowed by the Vilvo Group! Autocar / gmc / White /Mack ! busy boys !

Ya those are clumsy looking but effective !

Yup you got it! Those numbers were just examples! I don't have the exact specs for your engine just used those as examples! model years seemed to dictate timing usually 19 to 24 area! Probably emissions related!

Nope install then set! if you’re at say 21 park the pointer at 24 23 and set with the a/b light!

https://40ton.net/kierowca-wynalazca-sam-zaprojektowal-ciezarowke-paymaster-mogl-byc-rewolucja/ Interesting read on a guy way ahead of his time!

I like it too ! ANY filter prior to that goofy Volvo setup is a bonus! This is one of the things we need to add to our growing list of Betterments for the V engine! Forgot to add the electric Primer Pump to the list too! Should be mandatory on all fuel systems these days! I'm feeling feisty this morning want shit to get fixed!😂

CUPS ! It will only get worse! Mackpro nailed it from the get go in my mind! When you have this job done have them check the engine brake slaves as well your already in there!

Now Thats uptime! Volvo trash! Just an observation when doing that test our guys would also watch for an intermittent large bubble passing down the tube every 6 to twelve inches! The foam is not a firm indicator! when a bubble passed by your assured its cups! There is always some fine bubbles from what I observed! Again just an observation!

So Bro ! Its been a month! I and maybe others are curious as to which direction you took if any on this repair if any ? This kind of info can be helpful to others who find them selves in your situation! This here was a semi common issue a one point which I believe has been addressed on the newer engines! That said maybe take time post the direction you took if any to this repair to assist others in this same scenario .

Me also ! Last thing we need is to involve more politics Here! Bad enough we have what we have! Stick to the important stuff ! TRUCKS!

Joe Buddy ! Don't be offended ! I Brought up the Ground thing Up ! Because I noticed you had mentioned to check them earlier and to confirm He had checked this before wasting any more time chasing shit! Cheap And easy stuff first ALWAYS ! Just A little nudge! 😉 And SLED Keep us Posted Its fun for us to help and its satisfying to get the fix nailed down for us guys! makes it worth coming here! AND It may help others in the process ! 🙃Keeps Our Brains Working!😬

The E9 had its issues! Valve seat issues / Lifter/ Cam failure, head bolts would break head gaskets leaked. piss poor engine brake this is a case of failure By design the brake as we all know has always been sort of ho hum on most Mack engines up till the power leash , water pumps failed a bunch at the begining! As usual Most of the issues resolved Before the end of the run on these ! The other weak point on these was the counter bore ledges would sometimes crack ! In my opinion the head bolts were under sized An really should have been fine thread and or studs! Thinking back on it How ever the 866 had fine bolts and they would leak also! they also had the liner ledge issue! If the big Six had entered production I would have hoped they would have used the E7 style liner set up but who knows ,it never got off the ground! also notice they left room for the econovance there in that design they were a forward thinking bunch of guys! But they were working with stuff they mostly already had they were working on a budget in my mind! That's likely why it never got finished! Money constraints !

Yup grounds are important ! an odd happening We ran across years ago with a brand new Etech in a log truck that would stop on a hill by the same cedar tree on the same mountain dog trail every once in a blue moon! Started getting quite frequent we consulted Mack and the took the same truck and duplicated the same problem on the Dyno and found it was Voltage spikes at the alternator at a certain RPM their tech happened to spot the surge when the engine quit at one point ! Just a stroke of luck if you ask me ! How ever we replaced the alt and it put a stop to the issue! Electrics can do strange shit! Dam lucky we could have search for that for months! Years! Comes back to what Onyx said experiences! Rambling !

So my suggestion is to buy a relay ! Use it to weed out the bad one if there is a bad one! Do this one at a time and try it! If after you have gone thru all 5 or six with no results then we need to look else where! If you run across one that corrects the problem then bobs you uncle! You have checked engine grounds correct?

In my mind the the cam sensor un pluged should throw a code also the flywheel I could be Wrong on that How ever if the if computer doesn't see either or of these sensors one would think it would throw up a code for it! That said if Your original issue was not throwing up a code it is likely a main power issue that the ECU doesn't SEE as a problem! Relays as mentioned! Just my opinion

we have seen the shafts break another long shot ! This shaft may have a crack and still driving! also the drive coupling could be worn!

Bud did you check the Power relays on the right hand left in the glove panel there? I chimed in late here ! Are we still chasing the number one post ? looks like it got side tracked!

Unless the dowel was missing no! there is a small possibility the dowel stuck in the fly wheel if thi was sent to the machine shop for grinding and was never put back in!

Couldn't resist poking some fun! Joe!

so that hole needs to line up with the hole in the crank its the dowel hole!

hmmmmm! 😬 starting to wonder about you two!😂

So Thinking on it and after seeing some of the posts by you folks I would say ! Main bitch for me are the Rocker bolts that really never got resolved the Fuel pump yup that's one they fixed that wasn't broke to start with! they had the perfect setup on the original E7 , There ain't no nicer serviceable engine out there than an E7 in a CL or CH !!! I Never liked the plate oil cooler! Come to think on it The original e7 was set up almost perfect! If they had put the powerleash on the the original E 7 the engine would have been pretty nice! problem free engine! Etec was OK how ever it was the turning point the down hill slide to unreliability ! Once the cam thing got sorted it was decent till 2002 ! Rocker bolts didn't start breaking till they made them smaller and powerleash came along ! the EGR was the big slide and this was an experiment for ALL the engine companies ! except Mercedes they got an extra year to comply for some reason!? They pretty much resolved almost everything else ! The turbo issue was the big thing in the beginning what ever they did to resolve this worked after a year or so of embarrassing Failures! So the only fixes for me would be them rocker bolts put em back to the correct size 7/16 , and put the fuel system back to pre 1996 aboriginal E7and the oil cooler Don't like it just because I don't! just another fix that wasn't broken! The dollar store fuel line fiasco seems to have resolved so I will consider that fixed! So really comes down to it Was there ! But they regressed! Those being fixed everything would be at an acceptable failure rate !