Need help motor turns over but half way through the rotation it locks up it will rotate backwards till it locks up again
If you removed the glows and attempted to turn it over then your next step would be to pull the valve covers and start inspectingIt was Runnin great then all of a sudden it smoked alil bit then stalled an I started it again ran for 30 secs then died it didn’t make no noise or anything oil was perfect with no metal in it An anti Freeze was also good I marked the crank an the block an it turns completely over till about 3 inch from a complete rotation
There was no work or anything taking off that I know of but it’s been a great truck while I had it up until this pointI’m a diesel mechanic by trade, my smallest scope is 5.5mm still too big to go through a glow plug hole. If you pulled the glow plugs and still won’t bar over, that eliminates hydro lock either fuel or coolant, that leaves mechanical interference, ie a valve or maybe a rocker bridge jumped if a valve stuck in the guide. The minimum ,the heads are probably coming off would be the next step. If you pull the valve covers your not far from pulling the injectors and running a scope through those. 4” of rotation is about 30 degrees, could be something passed by the intake valve, was there any work done that had the intake bridge apart. If you find what it is you might pull the exhaust manifold and fish it out by rotating the exhaust valve open.