Needing Help ISX CM870 CPL8518

[Rawze]

(09-25-2023 )Bakanka Wrote:  

(09-25-2023 )Rawze Wrote:  It being a CM870.. makes you wonder what wedges they used ...

...
replacing the head to new oem is waste of money and time unless liners are raised to its specifications right?

So is there and other way to save that head without removing it from its place, like re taping with better thread taping materials?

I have the video when I opened valve cover I recorded but how can I upload it here so you can see it.

YES, replacing just the head on an 800k mile old engine block will ...

(A). disturb everything including the liners, etc. and it will not last very long after that. Does not matter how it was done.

and...

(B). Be a very large expense + downtime, that will be completely wasted, including having to replace the new head again in only 2-3 years at best, when it does let go, or the engine reaches a million miles+ which at this point, is right around the corner.

I.E.> a very BAD idea to only do the head and waste all that moneys and waste the head too for only a couple 3 years more of driving it even if you did get lucky.

So,.. if the head comes off it, then its inframe city + raising the liners to 0.015". and all the things mentioned in the link I posted above on the extra steps needed to make it last another million.
ref: http://rawze.com/forums/showthread.php?t...6#pid70606

The engine is long in the tooth, and towards the end of its expected lifespan at this point any ways. It does not matter how much stuff external to this that you have done, all those things you replaced will help prevent only those component failures, and not the #1 thing that causes a CM 870 to need to be inframed any way. That is the liners themselves, and how long they go before eventually dancing in the block.. or wrist pins which when one fails, putting a huge hole in the engine block with absolutely zero warning, because some idiot did not inframe it a 1.0-1.1 mil miles like they should have.

The engine liners, wrist pins, rings, etc. will not last much past 1 mil or so, no matter how many other parts that you throw at them. This especially if the engine is worked moderately hard.

ALL ISX's do this, some sooner than others. It depends on ...

#1 cause = bad delete programming. This is in fact the most common issue of them all. 95% of all delete programs are VERY harmful, and are a silent killer of the isx, all while most truck owners will swear like fools it seems to run ok, until its far too late.

#2 cause = How they are driven. Too many clueless drivers/truck owners who are only lugging the engine below 1500 rpm all the damn time into an agonizing death everywhere they go, like a complete fool. Driving it below 1500rpm, and even worse, doing so when going up hills and/or when heavy, and under higher torque demands. That and, and the early death of the engine can be amplified greatly, if the truck rear ends are geared too tall for its application.

#3 cause = Some jerk-weed owner who does not understand that cranking up the torque all the way up to max 2050+ (or higher) cuts the engine life in half or less.

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As far as saving the head with it still in place ... it would be questionable at best. If someone could manage to properly heli-coil the stripped out holes, and then get proper torque on all the components, then maybe it will last a while longer... but it is a gamble.

You said the injectors were ok, but how were they tested?. - It should have been done like this video shows, but few mechanics/shops even have the proper test plate, and are completely dam%mn cluleess!!!...
ref: http://rawze.com/forums/showthread.php?t...8#pid67948