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Bumping an ANCIENT thread. My 1987 6.9 is said to be stuck. Prior owner bought it as a "ran when parked" truck that had been sitting for years. He never could get it to turn over, so he sold it. He only tried to turn it over using the starter, from what I can tell, and no guarantee that he had 2 good batteries on it, either.
He pulled the injectors and squirted inside with PB Blaster and still no joy.
I've done this before on a gas engine but this is my first time trying it on a diesel, so could use some tips.
What I plan to do is to fill the cylinders via injector cavities with my go-to mix (shot of Kroil, let it sit for an hour, then healthy pour with Marvel Mystery Oil) and let it sit for 24 hours. After that, I plan to try to turn the engine over using a breaker bar on the balancer bolt (looks like it's 15/16").
If it turns over, I'll throw a few hot batteries in it and spin the engine over without injectors to try to get the MMO out of the cylinders. Don't want to hydrolock it.
Is there any advantage to pulling it in 4th gear to un-stick it?
I got a marine ford 302 unfrozen by rocking the harmonic balancer bolt with a breaker bar. I got the engine running but it wasnt happy. It had so much blow by, the hull filled up with smoke and the engine would choke itself out on its own smoke. After about 9 hours if operation, I decided it wasnt gunna fix itself so I removed and replaced the whole engine. When I tore down the engine, I didnt find any broken or stuck rings or other smoking guns. Weird.
Well, i was aware i was bumping an old thread --- but was actually looking for an update, if any, from @bulletpruf who was having this struggle only two years ago.
And if there's been a good success, have it added to the information in this archeological gem of a thread!
Thanks for posting the video Scott. I'll have to watch some more of your videos to see what became of Project Brutus. Too bad the cylinder was so damaged you couldn't fix her with a hone and re-ring.
Thanks for posting the video Scott. I'll have to watch some more of your videos to see what became of Project Brutus. Too bad the cylinder was so damaged you couldn't fix her with a hone and re-ring.
Enjoy the series; lots of trials and tribulations as I tried to find a good engine...
Is there any chance that this engine can be borescoped/endoscoped? Looking at diagrams of the IDI chamber I'm thinking maybe not.., unless it's extra flexible and extra-small
I've wondered the same thing in the past. I don't think you could get a bore scope through the pre-chamber. Even pouring ATF into the cylinders or spraying it with Kroil/PB Blaster would be slowed down by the pre-chamber.
Well, I got the smallest diameter scope i could find on amazon, and it almost worked. The last 1.5" or so of it is inflexible steel, and wasn't able to snake down through the D shaped hole....
This engine was allegedly very recently rebuilt, and the injectors all came out easily (except the one that was missing the copper washer... ) Injectors near the watery-grave corner (firewall, driver side -- is this cyl 5?) had some gross rusty-crusty on, which bodes poorly. A missing injector washer on a "fresh" engine also seems a bad sign --- it wasn't as badly stuck as some, but obviously had been run for some amount of time, and indicates carelessness.
Anyhow, injected ~60cc of ATF into each cyliner, or until filled. I'm pretty confident that most of it made it past the prechambers. Oil pan plug is cracked loose so it will drip, when (or if) and atf makes it to the pan.
Well, to follow up ---- we got it unstuck, SUCCESS.
After soaking with PB blaster and ATF (filled the cylinders essentially) for a couple weeks and still no luck pulling on the crank bolt, we dragged it.
Put it in 4th gear and dragged it backwards. Theory that 4th is 1:1 and therefore the most mechanical advantage. Skidded for a few feet and then started chugging.
Now the underhood area is a MESS but that's fine. The idi chamber restricts the stuff blowing out of the cylinders so we put it in reverse (highest engine rpm vs wheel speed) and dragged it a few more times to really blow it all out of there. Also, since the dragging backwards in reverse gear results in the engine turning 'forward' I'm assuming the oil pump was working, and therefore unlikely to cause damage. The rpm are really up there when in reverse at ~15 mph.
Don't forget to disconnect the mechanical fuel pump!
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