The Taurus 3.8 V6 fan, and V8 Thunderbird fan can be found at Pick-N-Pull anytime for about $35.00. They are both dual speed and I HIGHLY recommend them. Depending on your radiator shape, you may want to consider both, as their shape is different. My wiring harness has provisions from the ECM to control both HI & LOW fan circuits, saving you money as well! You will have to provide appropriate sized relays. I have measured the Thunderbird fan on HI to be 25-27amps, and LOW to be around 15amps. The standard “ice cube” relay will not survive for the high side. I recommend this 75 amp continuous duty relay from Summit Racing.
Vacuum Port / Break Booster
is a vacuum port on the back of the intake manifold. It can be used for a brake booster. Some engines have a plug here. The plug can be carefully drilled & tapped to 1/8” NPT to accept a
barb fitting for hose hookup.
Gas Pedal & TAC installation
If you have purchased a DBW engine you will have an APP (gas pedal) and TAC module (small black box) with your turnkey engine package. The gas pedal easily mounts to a vertical surface inside the cab. The TAC module is weather proof and can be mounted anywhere within reach of the corresponding harness plug and APP wiring. Avoid high heat locations near exhaust. Note: The Gas Pedal can be modified if needed. Shortening the throw will increase throttle sensitivity. Ensure the sensor maintains full range. Some came with an adjuster for movable pedals, you will want to remove this portion and attach the actual pedal to the sensor at your desired angle.
PCV Valves & Crankcase Gas Evacuation
For rock-crawling this can lead to a hydro-locked engine in a roll-over. Engine oil gets drawn into the intake and further into the cylinders. I have been happy with evacuating the crankcase gases through the exhaust system. A venturi is welded into the tail pipe past the muffler and a check valve is threaded on it. The flowing exhaust gases create a vacuum on the crankcase with little to no possibilities of oil getting into the intake manifold. It is highly recommended to maintain some sort of POSITIVE crankcase gas evacuation. Without positive crankcase vacuum, moister and oil sludge builds up decreasing the longevity of the engine.
For HARDCORE rock-crawling, I also recommend relocating the drivers-side valve cover port to the same location as the factory passenger-side valve cover port. It is easily drilled and tapped to 1/8” NPT and a 90-degree barb fitting threaded in. Simply cap the factory PCV valve at the rear and leave in place. This modification will eliminate oil that “puddles” in the rear of the valve cover and subsequently get drawn into the evacuation system on step, near vertical climbs.
COOLANT SYSTEM FILL
I recommend initially filling the coolant system via the water pump outlet port on the top as well as the radiator. This helps eliminate an air lock, particularly when not using the heater ports.