My first 3.0 EFI

[rgsauger]

Hey bud, you gotta listen up on this one or just get ready to throw the whole junk in the trash. If you honed this motor while the rest of it was still together, I’m sorry but you’ve got to take it apart and clean it out. There’s absolutely no way that grit and debris did not get into your motor. If you care about it at all, it’s gotta come apart and get cleaned. Sorry but that’s the truth. Unless you know something that we don’t… like you had the world‘s best shop vac hooked up to it and you put clean oily rags in the bottom of the bores and that type of thing. Even then, the guys that do it for a living would still insist on it coming apart.

[moparbarn]

Gotta.STRONGLY agree, just a ticking time bomb at this point!! Might as well have mixed valve lapping compound in your fuel.....

[Chaz]

Late model blocks had a row down the middle. The bottom one is offset to send water around the outside.



The later early model blocks had a couple-few offset at the (aprox) seven O-clock position. (yes those are late model sleeves in an early block, no ex-notch)





Taxi-cab Mirage .... Behind the liner porting, late model sleeves, 3.1L, 300 ign / 250 fuel boxes, late model plenum, 300x reed adapter plate ... bury a 120 mph GPS speedo with a 35" Hoss wheel .. still plenty of life left in them ole gals ...

[Aaronhl]

oh cmon guys u tell me this now

[FUJIMO]

...why? is it too late?...

[Aaronhl]

well i guess ,,, i did hone the engine with it upright if that helps any,

there was bad gas and water in the gas tank when i bought the boat and looking at the condition of the crank weights and edges of the crank journals it was ran (sat with water in it) so there is rust on those parts and ideally it should be torn all the way down

I feel i can clean it pretty well but the rust is not something that will go away and im sure it can irritate just like the honing dust that is leftover

[FUJIMO]

...a DDA (detroit diesel allison) engine, while in service out in the field or in the bilge, are done this way. not a two stroke. a two stroke is of the highest "sustained" r.p.m. range engines, out of the three main engine design groups. (diesel being the lowest rpm). a two stroke rebuild should be performed in a "clean room" envirement & always completely gone through. rust of any kind internally in a two-stroke, translates into a very short lifespan. very short. just as an example.

[Chaz]

oh cmon guys u tell me this now

Aaron, be grateful that Massa Fugiphotosan caught the fact that the motor "was still together" and said sumptin ..
Even if you didn't try to hone it, some of that slag from the burnt pistons has went back into the lower crankcase and into the bearings along with every nook and cranny.
If you find some grit in the intake manifold, then chances are pretty good that it got drawn into other cylinders as well.
As it been said .. many times .. pull it apart ... completely !
Wash everything ... then picture and question time ..
You might get a few .. pokes or prods along the way ..
But I assure ya .. ain't no one gonna leave ya hangin halfway thru the build .. or steer ya in the wrong direction ...

[Aaronhl]

yea i hear ya you guys are always helpful and im gonna think a little bit about what I want to do over the winter with the engine

Do you think I got all the piston ring pieces out??????????

[moparbarn]

Only 1 way to know, tear it down & see. All roads are leading to a complete teardown.

[Aaronhl]

Do you guys concur this is detonation of the piston caused by those cylinders being lean? Either not enough gas through the injector or two much air through a reed?? Is there some sensor or electronic that would cause this issue?

[Chaz]

Let us know the before and after flow numbers of your injectors. Then we'll see the answer together ...