well... i finally get to

[malibu795]

a series of someones missed the fact that .020 didnt clean up the gouge in the cylinder wall till it was siting on my truck and guy and i were BSing about the whole ordeal.

so off the truck and back to the machince shop last night went the block... and was told it would be done before 1200 today....

guy offered to delever the block to me in moorpark when he got it back form the machine shop. along with loaning me some specialty tools as well. and has done his best to take care of me as well. :hug: :beer

i am not trying to through guy under the bus.. it just doenst look good period.

 

[Trippin]

All 6.6L Duramax are externally balanced. The LBZ/LMM cranks have smaller dia. counterweights so the flywheel and damper have even more weight in them than the LB7/LLY.

It is almost impossible to internally balance a Duramax. I know two shops that have tried. They got close, but in the end had to add a little weight to the damper and flywheel.

What a fiasco, boring Adam's block. Our initial readings with the dial bore gauge showed that it would clean up at .020 over. However it is really hard to get the gauge positioned in just the right spot to find the absolute lowest point.

We align bore the mains, bore the cylinders and square the decks all on a CNC machine so everything is indexed to the factory blueprint and as precise as we can get it. However the machinst overlooked the fact that it didn't clean up at .020. The damage from the burnt piston was just to deep in one tiny little spot.

So I stayed late last night and cut a set of .040 pistons for Adam and my machinist worked late into the night to bore and hone the block "again" so we can get Adam up and running asap.

 

[slowlmm]

Just another reason I went with guy. he was always willing to help no matter wht time it was night or day.

 

[malibu795]

one of guys mech droped the block and tools off about 1630ish yesterday BS'd wiht him for and 45minte or so then got to work..

got copper? last engine

what is left off our fiasco of a whole. IMO i ran more power with worse walls then this :rofl: it will get me running agian..

pistons are in right.. but none of teh engravings line up....

stoping point was 0200 left head is one vlv lash and fuel lines need done.. right is just siting there with 4 bolts snuged on there holding it not bad for less then 7 hours of wrenching aint pretty but very functional....

 

[ruffmanatv]

Good luck Adam. You aren't wasting anytime putting that engine back together. Looks good.

 

[TrentNell]

thats some great headway in a day she should be running in no time sucks you hit some snags but it seem like any big project i have ever done has always been a pain in the a#% , good luck on the rest of the build looks great .

 

[slowlmm]

Umm adam are you sure your pistons are in right some times they get put in the wrong boxes after being cut all mine lined up with arrows forward and up. might wana double check.

 

[malibu795]

Umm adam are you sure your pistons are in right some times they get put in the wrong boxes after being cut all mine lined up with arrows forward and up. might wana double check.

done didt that.. engravings are wrong.

all the functional stuff. is lined up ie oil squirter and flywheel cut out. rod run the center of the wrist pin.

thanks for the call through johny

if the piston were backwards, there would be good chance of binding. only thing i had to change was flippig a couple rods 180... i dont know what is up with the engravings.......

 

[malibu795]

thats some great headway in a day she should be running in no time sucks you hit some snags but it seem like any big project i have ever done has always been a pain in the a#% , good luck on the rest of the build looks great .

this is the first engiine re-build i have dont that has been this much hassle


off to drop of tools and turn wrenches

 

[slowlmm]

done didt that.. engravings are wrong.

all the functional stuff. is lined up ie oil squirter and flywheel cut out. rod run the center of the wrist pin.

thanks for the call through johny

if the piston were backwards, there would be good chance of binding. only thing i had to change was flippig a couple rods 180... i dont know what is up with the engravings.......

adam i would call guy first.. i still belive tht piston is wrong. and fy the oil squirter will still line up if the pistons on the wrong side

 

[LBZrcks]

done didt that.. engravings are wrong.

all the functional stuff. is lined up ie oil squirter and flywheel cut out. rod run the center of the wrist pin.

thanks for the call through johny

if the piston were backwards, there would be good chance of binding. only thing i had to change was flippig a couple rods 180... i dont know what is up with the engravings.......

Flipped the rods? Did u put the rods in the correct cylinders? They are numbered

 

[malibu795]

Flipped the rods? Did u put the rods in the correct cylinders? They are numbered

yes rods are in correctly..

 

[slowlmm]

adam wht did your clearnces wind up at for your rods and mains?

 

[Trippin]

I don't think the engraving is wrong. Right and left pistons have their own CNC programs to cut the bowls and engrave. There is a .030 offset in the pin location so if the engraving was wrong, the bowls would also be cut off center.

It sounds like you have two pistons installed backwards. The motor will not bind, it will however change the rod angle on two cylinders.

The engine will physically run, what effect having the two pistons in backwards will have on the dynamics of the motor is anyone's guess.

This was a common practice in the 1960s. Engine builders would install all the flat top pistons in a SBC of SBF backwards in order to get a different rod angle at TDC and affect the leverage the rod exerted on the crank at TDC.

They felt it helped power.

 

[slowlmm]

Interesting

 

[Gasuout]

There should have been 4 rights and 4 lefts I would think . Well hopefully all goes well . The one goin wrong direction should mean there is another on the other side same way I would think or somewhere . Or if on same side rods backwards on piston . Or two reversed holes .

The .030 offset would make me want to tear it back down and figure it out though . Even with no bind .


I know you dont want to hear that Adam , but I would slow up and figure it out .

Johnny

 

[the4wheeler]

it was late in the evening ( in our defensive lol) when the pistons started going in and with out achuly being told the engraved arrows point forward and olny being told there is a offset figured the arrows pointed to the offset and did not mater which way but Adam went by the crank releafe cut to git every thing in

in shur guy and adam talked when he returned back the tools and at this point in time the pistons are most likley orented right and the motor is just about ready to go back in the truck

 

[JOHNBOY]

I don't think the engraving is wrong. Right and left pistons have their own CNC programs to cut the bowls and engrave. There is a .030 offset in the pin location so if the engraving was wrong, the bowls would also be cut off center.It sounds like you have two pistons installed backwards. The motor will not bind, it will however change the rod angle on two cylinders.

The engine will physically run, what effect having the two pistons in backwards will have on the dynamics of the motor is anyone's guess.

This was a common practice in the 1960s. Engine builders would install all the flat top pistons in a SBC of SBF backwards in order to get a different rod angle at TDC and affect the leverage the rod exerted on the crank at TDC.

They felt it helped power.

X2 on the highlighted. You can swap pistons from side to side. The oil gallery will line with the squiter. The front arrow will point to the back and the wrist will be on the other side of center. Easy fix.

 

[ripmf666]

X2 on the highlighted. You can swap pistons from side to side. The oil gallery will line with the squiter. The front arrow will point to the back and the wrist will be on the other side of center. Easy fix.

Like Johnboy said the LB7 we just done had 4 flipped around the wrong way I posted a pic awhile back of it the motor would turn over fine no bind but with the offset on the wrist pin it will wear that rod end buching out fast.

 

[LBZrcks]

It may suck Adam, but I say pull it apart. Do it right or do it twice imo