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Mark nails this one ! In my opinion ! Replace the cable ! But there is a slim chance it has an air assist in which case you may have a bad slave!

Yup injector spray will cause that !

So look at the power tower where the pump mounted! This is and 89 engine Correct ? Does the power tower have extra un used plugged off holes? Some where in this era they were transitioning to Inline pumps and the power tower was drilled either or and plugged off accordingly to the Pump installed! they also did this on E7 when they transitioned to R Bosch! It was only a short period of time this happened!

sorry I Didn't see your reply ! I once ran across one of these that the engine ran so long after the failure the only noticeable thing was a miss ! no banging sound! The piston was in similar condition !the peices were pounded into What was left of the piston The picture you show there it almost looks like a cracked liner as well ! They tend to crack near the top also

sorry I Didn't see your reply ! Did it come with a Fuel pump????? I once ran across one of these that the engine ran so long after the failure the only noticeable thing was a miss ! no banging sound! The piston was in similar condition !the pieces were pounded into What was left of the piston The picture you show there it almost looks like possibly a cracked liner as well ! And likely a cracked counter bore! They tend to crack near the top where the top ring stops ! That is my concern for your running engine ! the only way I know of to isolate this is to remove the cross over at the rear of the water manifold and fab up some riser tubes with drain cocks on the top ( WE actually built a set of theses) and run the engine and watch which side develops bubbles! By the way! Did you check the head bolts on the running engine bottom corners ??? The problem with a v eight is you can't take the Water pump out of the equation like an e6 / e7 ! Makes it harder to nail down!

So the piston damage is likly due to an injector tip being ruined by seat chunks ! And run for too long after the failure! How long was it run after it started banging!?usually you can expect to replace piston liner head injector and turbo!

Just replace! Ain’t worth messing with!

A flip hood would be nice though! How ever I’m not an md hater I am ok with it they need to offer it with hydraulic brakes though air only it limits there ability for sales need to be able to hire cheap labour if there is such a thing these days!

well you got the miss now maybe time to swap see if it follows!

I know it’s time consuming but. Have you tried a swap?Bad ecu?

yup sorry bad choice of words!

Did you run compression/ cylinder balance test ? Or do You assume you have a bad injector! have run into the odd bad valve!

You need to post the engine number MP7 or 8! You likely need to rebuild the oil separator on this or just replace it!

I'm a ''Negative Nelly'' when it comes to MP's.... Jojo Yup Me too!

Yup ! replaced more that one in the day! And the W model was even worse!

Still think PTO how ever as Joey states Is a hard call ! That fact you hear it in neutral says something to me, Its in the main box and it only telegraphs in direct when driving ! just my thought! Check the drain plug for chunks and get some one to double check the Ptos in my opinion! Wouldn't want to rip a trans out with out evidence!

Remember these first years of super liner was Derived from a W model cab over! Hence The model RW ! which also had the steering box on the axle the drag link is out of view on the back side and is about 6ft long ! MH frame was used on second gen RW!

My opinion the inline is more resilient! I personally like the v pump for its simplicity! And had worked more with them saw a fare few failures the in-line was only use several years at the end!

This is one of those occasions where loose is better than too tight! Bet you need to add a 15 thou gasket to one or both!

I would check the backlash on the pto s. First! joey great minds ! 😂

huh didn’t see the post bro! Just saw this one 😂

Turn grade gripper off see if that affects things!

Bad or sticking injectors! As for boost leaks! The Best way to check for leaks is to pressure up the the whole engine ! build an and adaptor to plug off the intercooler at the turbo side! Apply Shop air regulated to 35 psi thru the after cooler and engine ! And turn the engine by hand till pressure starts to show on the boost gauge assuming it has one! Believe it or not! there is a point in the engine cycle the everything is closed momentarily! when you hit this point! you will find almost any leak you want to find even bloby past the rings and valve guides you will hear from the oil filler neck! ! Is the compressor plumbed into the intake hose ? These fail at the Joints at the hoses where they connect to the manifold and the compressor (common failure} ! A look see is not the best way to check!In my opinion you have one of three things there , in order of importance .> a Bad boost leak , lazy turbo ,or bad injectors !however I'm not there so I can't say for sure! don't apply the parts Cannon untill you confirm the boost leak theory properly! The lazy turbo is a tough call cause its its the most expensive and doesn't happen often ! last resort! Just sayin!

In my opinion that engine if it was fresh should easily do the job! After all your not racing it! If it has issues Fix the issues and leave the rest alone! Black smoke indicates lack of air or too much fuel! Have you checked for boost leaks !??? does it have a lot of blow by? For the job its doing it sounds like a lot of work to go thru to get a basic job done! When all you need to address is address the issues IE: a set of a set of injectors or a turbo and or some boost leaks! Whole lot cheaper and less time consuming! Also the 300 has a pretty large torque curve due to the fact that there is and Allison behind it! 460 not so much! I have seen a 427 with an Allison ! I am just thinking about time vers result here! What you purposing is doable but worth while ????? Just saying!

Team effort Bro!