Comprehensive Guide for Oil Pressure Sensor Technician: Oil Pressure Sender Extension for Small Block Chevy (SBC) Engines
What are the Detailed Specifications and Measurements for the Oil Pressure Sender Extension SBC?
Compatible Oil Pressure Sender Extension Pipes and Kits:
– Thread Type: The oil pressure sender extension for SBC engines typically uses a 1/8-27 NPT male thread to attach to the engine block.
– Material: These extensions are often machined from premium quality steel with nickel plated zinc for durability.
– Ports: The extension kits usually feature multiple female 1/8-27 NPT threads, often including 90-degree and 45-degree ports for flexibility in sensor placement.
Example Kit Specifications:
– GlowShift Oil Pressure Sensor Adapter: This adapter features (3) 1/8-27 NPT female threads (2 at 90 degrees and 1 at 45 degrees), a 1/8-27 NPT male thread for engine block installation, and includes port plugs.
How to Check the Oil Pressure Sender?
Oil Pressure Sender Test Process:
1. Disconnect the Sender: Remove the oil pressure sender from the engine block.
2. Measure Resistance: Use a multimeter to measure the resistance of the sender. For example, a typical sender should read around 0 ohms at 0 PSI and increase resistance as pressure increases (e.g., around 30 ohms at 30-50 PSI).
3. Check for Continuity: Ensure there is no continuity between the sender’s terminals and the engine block to avoid false readings.
4. Reconnect and Test: Reconnect the sender and test the gauge to ensure it is functioning correctly.
What is the Difference Between an Oil Pressure Switch and an Oil Pressure Sender?
Roles in the SBC Engine:
– Oil Pressure Switch: This is typically used to activate a warning light or alarm when the oil pressure falls below a certain threshold. It is usually a simple on/off device.
– Oil Pressure Sender: This device provides a continuous reading of the oil pressure to the gauge, allowing the driver to monitor the pressure in real-time. It varies its resistance based on the oil pressure.
What are the Best Practices for Installing an Oil Pressure Sender Extension on an SBC Engine?
Necessary Tools:
– 19mm wrench or socket for threading the adapter into the engine block
– 22mm wrench for threading the sensor into the adapter
– Teflon tape for threading
Step-by-Step Installation:
1. Locate the Installation Point: Typically, the oil pressure sender is installed near the front of the block, between the timing chain cover and the intake, or just above the oil filter.
2. Remove Factory Switch: If applicable, remove the factory oil pressure switch from the back of the engine block.
3. Thread In Adapter: Wrap Teflon tape around the threads of the oil pressure adapter fitting and thread it into the engine block. Tighten using a 19mm wrench or socket.
4. Thread In Sensor: Thread the sensor into the selected port and tighten using a 22mm wrench. Ensure to wrap the included port plugs with Teflon tape and thread them into the unused ports.
Potential Pitfalls to Avoid:
– Stripped Threads: Avoid stripping the threads on the engine block or adapter. Use Teflon tape to ensure a secure seal and prevent damage.
– Clearance Issues: Ensure there is sufficient clearance around the installation point, especially if headers are installed.
Is it Feasible to Use a Universal Oil Pressure Sender Extension Kit on an SBC Engine?
Compatibility:
– Universal Kits: Many universal oil pressure sender extension kits are compatible with SBC engines, but it is crucial to verify the thread type and ensure the kit matches the engine’s specifications.
– Modifications: In some cases, minor modifications may be necessary, such as using adapters to match the engine block’s thread type. For example, if the engine block has a 1/4-18 NPT female thread, a brass adapter may be required.
Reference Links:
- IH8MUD Forum – Oil Pressure Sending Unit Ohms: GM – Oil Pressure sending unit ohms – IH8MUD Forum
- GlowShift – Oil Pressure Adapter for Chevrolet Small Block 305/350: Oil Pressure Adapter for Chevrolet Small Block 305/350 – GlowShift
- Team Camaro Tech – Oil pressure sender location on small block: Oil pressure sender location on small block | Team Camaro Tech.