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Trying to clean up the wiring on this 4.9 and get all my gauges working again for a Mobark Wood Chipper. I have a the chipper manual and someone wrote "1990" but it seems older than that. If it's correct, that's would be the approximate year of the motor too. I "think" i figured out these sensors and guages...can anyone confirm? Engine runs good, but sometimes I get no spark until I fiddle with some wires and then it fires right up. I suspect the connectors on the coil and want to replace them and clean up the other messy work. Is this right?
1. Oil temp sensor on right right of block - 2 wires goes to a light?
2. Water/coolant temp sensor - 1 wire goes to gauge that maxes out at 250 degrees (hard to read the rest)?
3. Connector style on the coil?
4. Is Motorcraft SP-420 spark plugs correct?
5. Any recommendations for spark plug wires?
That "oil temp" light is a low oil PSI light like in your car.
Most of the time when oil psi drops below 5 psi the light will come on.
If this was mine I would replace the temp gauge and oil light with gauges.
Oil should not be a issue with a mechanical gauge just dont use the plastic tube that comes with the gauge they make a copper install kit.
The plastic over time will break, blow oil all over running it out of oil and burn up bearings - NO GOOD!
On the temp gauge most mechanical gauges the probe will be too large to fit the block IIRC so may need to run a electric gauge you can read as it will not be painted over.
Just follow the paper that comes with the gauges you should be ok.
Dave -----
I say run new gauges because on the car / truck the temp gauge is wired thru a IVR (regulator).
power to the regulator> to gauge> to sender. The sender is a variable resister to ground and why 1 wire.
I dont know how that gauge is set up and why just get an aftermarket gauge.
The oil low PSI light I am guessing has power to the light then to the sender as it would be a on / off switch based on oil PSI to ground?
Why the sender has 2 wires who knows???
Again I would replace both with new gauges and install per the paperwork that comes with them.
No need to over think this.
Dave ----
If the current water temperature gauge works, I would just leave it.
The odds of a wood chipper overheating seem slim. If it did run hot I would just remove the thermostat. If that idea bothers you, drop back to a 140 degree thermostat.
I don't think I would be OK with an idiot light from the oil pressure. To much risk of something bad happening. Here's a post with info on where the oil pressure sender is located near the oil filter.
Do you have a plug here or a sending unit that not being used?
I would use aftermarket 12 volts sender with matching gauge. I think an electric system is simpler to Install, and less likely to leak due to a broken line from a direct reading gauge. I see the possibility of a wood chipper shaking or vibrating during use.
I will post again soon on my thoughts regarding the coil and ignition system.
Jim
A stock DS2 coil will have nail head connectors and a push ON horseshoe connector.
See photos below.
It normally has about 1.1 ohm's primary resistance and also uses a 1.1 ohms resistance (ballast resistor) in line with the coil.
What is your key ON voltage at the coil?
12 volts means you don't have a ballast resistor.
6 to 8 volts means you have a ballast resistor.
While checking the voltage, wiggle the wires to see if anything changes.
Quote: 4. Is Motorcraft SP-420 spark plugs correct?
5. Any recommendations for spark plug wires?
I used to work on ground support equipment at the airport. Deicer trucks had ford 300 six engine to operate the spray pump.
Most all of the smaller tugs had 300 six engines.
They always used Motorcraft spark plugs, I believe that's the same part number.
But realistically, you could use any old fashion style spark plugs. Just don't buy anything fancy.
Regarding plug wires, nothing fancy or high end was ever used. Personally I bought whatever was on sale. It not a high RPM engine, in your case it probably has a governor to limit RPM.
Personally, I feel your starting problems are related to the coil / coil connector.
Add some closer photos of the coil.
Jim
[QUOTE=JimsRebel;21574770]A stock DS2 coil will have nail head connectors and a push ON horseshoe connector.
QUOTE]
I knew it had to be something better than a damn spade connector slid over that nail head connector. Thanks man! I'll do some testing and report back. And I'll get the proper connector ordered.
