Engine issues
Thread Starter
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Senior User
Joined: Nov 2008
Posts: 104
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From: Sorrento BC, Canada
Engine issues
I have an 1991 7.3. I just put new injectors in it, and a new return line kit from a good diesel injection shop. I am also running 50% used oil. After I had completed installing injectors and return line kit, I washed the engine out. I cleaned up my shop, and came back to start it about 30 mins after washing engine. The engine had already been fired since installing the injectors. The glow plugs were all immersed in water so I didn't use them, and the truck didn't start. I went and grabbed a can of brake clean and sprayed a bit in the intake. I cranked it over and it started up and ran at 650 rpm with a horrible loud knocking noise from 1 or 2 cylinders. The knocking noise lasted for 2-3 seconds. Now I have a vibration at 2000 rpms and above, could have I bent a rod or broke the crank? I didnt use the glows to start the engine since the last time I had washed my engine out, all my glow plugs shorted out and blew out, due to being immersed in water. Thanks.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Any chance some water went into the intake when you are washing the engine?
At TDC 2 cubic inches of fluid in a cylinder can hydrolock the 7.3 engine, which could mean problems if a cylinder before that one had already fired.
Any chance there is still air in the injection lines and all cylinders are not firing evenly?
At TDC 2 cubic inches of fluid in a cylinder can hydrolock the 7.3 engine, which could mean problems if a cylinder before that one had already fired.
Any chance there is still air in the injection lines and all cylinders are not firing evenly?
Thread Starter
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Senior User
Joined: Nov 2008
Posts: 104
Likes: 0
From: Sorrento BC, Canada
I had the air hat with the air filter installed on the engine when I washed it. I used too much brake clean by the sounds of things but it never ran away on me. The knocking sounded like dry ether firing in a diesel, but it had oil in the fuel. The engine runs great other than it has the vibration above 2000 rpm that I can feel in the steering wheel and in the clutch pedal. The vibration feels like Im running a hand held leaf blower wide open. If I go down at steep hill at 60 mph and at 2100 and push the clutch in the vibration stops. The engine also has no abnormal noises or knocks after the brake clean. Thank you.
