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IH 400 Hard Starting

super99

super99

Well-known Member
My Farmall 400 has always been a easy starter, a few spins and it pops off. It started missing, so I changed spark plugs and now it runs good but starts hard. I have to crank it quite a while and if it starts, it starts as I let off of the key switch. Any suggestions on the problem? Thanks, Chris
 
Do you have a 12 volt system? The by-pass wiring could be the problem. It is supposed to provide full battery voltage when the starter is operating and allow the resistor to function when the engine is running. The resisted voltage when running helps the points to not get pitted & damaged as they would with full 12+ volts without the primary ignition resistor.
 
Check your connections. Sounds like you are losing voltage while cranking and the ignition circuit isn't getting what it needs to light the fires.

jt
 
You could try swapping the battery out for a good one. If it starts normally, then you would know that the battery is a little short on amps and needs to be replaced. As previously stated the starter is using up the power needed for the ign. system.
SDE
 
The bypass circuit basically works like this- normally when the engine is running the voltage to the ignition coil is reduced to 6 volts by a ballast resistor. When cranking, and only when cranking, a wire running from a terminal on the starter solenoid feeds full battery voltage to the coil, bypassing the ballast resistor, to help with starting.
 
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