TonyStuart
New Member
Thank you in advance for your help. I have a JLG 40H 4WD with a Ford LRG 425 dual fuel engine. I believe there are multiple problems so I will try to include all the info I can. The engine has been running sporadically. When it ran last all operations functioned properly. The engine would start and run at high (too high) rpm occasionally. Governor actuator appears to be working as it should. Carb has been rebuild several times with no change. Governor actuator linkage was adjusted to spec and rpm's were normal on gasoline but not on lpg. When it ran (well) it would run flawlessly for about five minutes and the engine would shut down. Thinking there was a safety shut off (oil press. or engine temp) issue, I tested the temp sensor and its in spec. Checked oil and it was 2 quarts over full, drained excess.
Now, engine won't start. It turns over and fires every couple seconds but won't quite get going on gas or lpg. Definitely combustion at times while turning it over. Plugs show spark but I'm not sure if it is strong. Fuel pump moves gas well. Air filter is clean. Cam timing checked, but didn't look at oil pump sprocket. Spark plugs are wet after starting procedure. New plugs and wires. DIS harness checks per manual all good except engine spark advance circuit showed open on all three leads. Coil primary .9 ohms. Coil secondaries 13.9k ohms each. Ground connections good. Haven't checked compression yet (waiting on adapter), but when it ran it purred.
I'm stumped... Any thoughts?
Thanks again
Now, engine won't start. It turns over and fires every couple seconds but won't quite get going on gas or lpg. Definitely combustion at times while turning it over. Plugs show spark but I'm not sure if it is strong. Fuel pump moves gas well. Air filter is clean. Cam timing checked, but didn't look at oil pump sprocket. Spark plugs are wet after starting procedure. New plugs and wires. DIS harness checks per manual all good except engine spark advance circuit showed open on all three leads. Coil primary .9 ohms. Coil secondaries 13.9k ohms each. Ground connections good. Haven't checked compression yet (waiting on adapter), but when it ran it purred.
I'm stumped... Any thoughts?
Thanks again