General
The oil pressure switch monitors oil pressure in the crankcase. If the oil pressure drops below 13.8-34.5 kPa (2-5 psi), the oil pressure switch is tripped and illuminates the low oil pressure indicator light. The oil pressure switch is located in the valley on top of the engine crankcase between the cylinders.
Removal
1. Unlock and open seat.
2. Remove airbox cover. See 1.4 Airbox and air filter.
Caution! Cover the injector intakes with duct tape to prevent con-taminates/objects from failing down the injector bore. Do NOT use shop cloths or objects that could damage the injector butterflies.
Warning! To protect against shock and accidental start-up of vehicle, disconnect the negative battery cable before proceeding. Inadequate safety precautions could result in death or serious injury.
3. Disconnect negative battery cable.
4. Remove the idle air control (IAC) motor wiring harness connector [87B] and throttle position sensor (TPS) connector [88B] from the fuel injector assembly. Tuck the wiring harnesses back out of the way.
5. See Figure 8-38. Remove the wiring harness connector from the oil pressure switch.
![](https://motoinstruction.ru/img/harley/2/111434.jpg)
Figure 8-38. Oil pressure switch
Notes:
- The engine in the figure has been stripped to clarify the location of the oil pressure switch.
- It will be necessary to use a universal adapter and extension with the oil pressure switch socket in the next step to fully seat the socket on the oil pressure switch. In place of a universal adapter and standard extension, a Snap-on Wobble Extension, such as the FXW8 or FXW11A may be used.
Caution! When removing the oil pressure switch, take care to avoid damaging wiring connectors and sensor bodies located nearby.
6. Using OIL PRESSURE SWITCH SOCKET (HD-45300), remove the oil pressure switch.
Installation
Note. Perform step 1 below only if original oil pressure switch is being re-installed. New switches have a sealant contact patch on the threads. If new switch is being installed, begin with step 2.
1. Coat threads of oil pressure switch with LOCTITE® HIGH PERFORMANCE PIPE SEALANT with TEFLON (LOCTITE® Part No. PST565).
2. Using OIL PRESSURE SWITCH SOCKET (HD-45300), install oil pressure switch. Tighten to 10.8-13.6 Nm (96-120 in-lbs).
3. Attach wiring connector to oil pressure switch.
4. Attach IAC motor and TPS sensor wiring harness connectors [87B] and [88В].
5. Connect negative battery cable. Tighten bolt to 6.8-10.8 Nm (60-96 in-lbs).
6. Remove duct tape from injector intakes.
7. Replace airbox cover. See 1.4 Airbox and air filter.
8. Turn ignition switch to the FUEL position and close seat. Then turn ignition switch to the LOCK position.
Caution! When closing the seat, make sure the ignition switch is in the FUEL position. If the ignition switch is in any other position when the seat is closed, the seat latch mechanism could be damaged.
9. Test oil pressure switch for proper operation.