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RustyCup 
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Joined: 17 Dec 2022
Location: America
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 Topic: HD6G- stuck engine.
Posted: 17 Dec 2022 at 8:26pm |
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Hey guys and gals of the AC forum. I recently purchased a HD6G trackloader. It has a stuck engine. I was told its been sitting about 20 years or so. I took of the intake manifold and got some diesel down there, one of the valves was open so that cylinder is soaking in diesel right now, but the other three had the valves closed, I poured some diesel down there in hope that some might make it to the cylinder. Would there be any other way to soak these cylinders down? I didn't really want to pull the injectors, and what would be the best way to manually turn this engine over, terrible access to the front of the motor.....
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gemdozer
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Joined: 17 Sep 2009
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Posted: 18 Dec 2022 at 2:03pm |
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You could removed the startor and try turning the motor by ring gear with big screw driver but make sure the master cluch is desangaged,the transmission and hydrolic lever are in neutral position.
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doctorcorey
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Joined: 17 Jul 2011
Location: S. KC Missouri
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Posted: 24 Dec 2022 at 9:35am |
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Can you move the flywheel at all, even a tad? Use something thinner, like free all penetrating oil, it will seep through the closed valves with a little time, and You can also pull the valve cover and 'pop' the intakes open to let the fluid flow in to the cylinder. Easy to check for stuck valves when doing it this way, too. My engine was stuck nearly solid, but after some time, I was able to work it back and forth with a big pry bar on the flywheel teeth. Easier to reach (and more leverage) if you remove the starter and go in through there.
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Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
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Posted: 24 Dec 2022 at 11:27am |
Was the exhaust covered when it was sitting? if it wasn't, you are probably wasting your time trying to free it. Everyone I have ever seen with an uncovered exhaust; the block or sleeve (in a sleeved engine) was severely rusted and need to be bored or resleeved.
If you take the injector out, try a borescope camera and you will have a better idea what you are dealing with.
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PaulB
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Posted: 25 Dec 2022 at 6:58pm |
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If you have the intake manifold off, remove the valve cover and use a bar to force down an intake valve and pour in some diesel fuel. If the engine is stuck, there's not much chance of turning it with a bar at the flywheel teeth.
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If it was fun to pull in LOW gear, I could have a John Deere.
If you can't make it GO... make it SHINY
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doctorcorey
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Posted: 25 Dec 2022 at 10:49pm |
 PaulB wrote:
If you have the intake manifold off, remove the valve cover and use a bar to force down an intake valve and pour in some diesel fuel. If the engine is stuck, there's not much chance of turning it with a bar at the flywheel teeth. |
The procedure we described is exactly how I did mine. Through the starter hole. It would only move a tiny bit at first, but any movement was all I needed to work it back and forth and get the lube working. The thinnest lubrication possible is what you want to quickly soak into the ring grooves and piston skirts. Works on car motors that have been sitting for decades, and will often work on tractors as well. Maybe his starter is frozen, or the front pump is seized. My method will likely show if either of these conditions exist. 
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Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel
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