No fancy tools required at all, but if people feel more confident using a specialized tool, then I say go for it. Personally, I use a 1 & 1/8" Open end Ring spanner, (a cheapie off eBay that I put in a vise and give it a slight bend a few inches up from the ring end - that allows it to go around the HEUI Pump. A 3/4" or 19mm Open end spanner allows you to remove the retaining nut, then the spacer & Solenoid can slide off to give you access to the RPCV nut (1& 1/8"). But you first need to remove the 17mm Acorn Nut from the Fuel Feed Banjo and move the banjo back towards the firewall so that you can access the 3/4" or 19mm nut on the back. My first step is to undo the 10mm bolts that hold the Heat shroud around the Fuel Filter, and the other 2 x 10mm bolts that hold the Fuel Filter Primer housing in place, lift up the filter and rotate it upside down towards the firewall so it's out of the way. Then I undo the vacuum lines between EGR valve and VSVR. Seriously, it takes me less than 15mins to remove the RPCV, 10mins to clean it, and 10 mins to put it all back together again. Not a big job after doing it 100's of times on many vehicles over last 8+ years.
Thanks...good to know and thanks for the link for FourJxone jackaroo. You went over it in the video, but I guess there is a relationship with the ORPS...I guess the ECU reads the ORPS (amongst other readings) and controls the RPCV accordingly?
I cannot tell you exactly what the principles are because this being an Isuzu engine and the RPCV being a Caterpillar valve, I can only pass on what the Isuzu manual tells me. However, your local caterpillar dealer may be able to pass on some further information. The RPCV is located in the back of the HPOP High-Pressure Oil Pump and is part of the HEUI injection system. The RPCV's job is to regulate the oil pressure being fed to the injector rail. The ORPS Oil Rail Pressure Sensor reads the oil pressure in the rail and sends the information back to the ECU which in turn regulates the pressure via the RPCV. The RPCV has a coil like device which magnetically controls a piston inside the RPCV which opens and closes a small valve to regulate the pressure. There are several issues that can affect the operation of this valve the primary being the piston sticking due to dirty or incorrect oil viscosity. The valve can be bent upon removal which also causes the piston to stick in its housing. If the valve cannot control the pressure for whatever reason, it results in rough running, no acceleration and perhaps no starting at all. I tried to purchase a RPCV in Australia and Isuzu could not help me but that was because of a deal that Isuzu had with GM. GM wanted a ridiculous amount of money for the part but didn't have any. I sourced one from Caterpillar directly at a much better price but they were limited. If you live overseas, you may be able to purchase one from Isuzu or try Ibrahim at Isuzu Dubai. A word of warning, these valves were fitted to several engines including Ford's, International and Caterpillar and as a result, there are a lot of cheap knock offs on online auction sites. You are taking a huge risk purchasing aftermarket valves, some work some are useless. My suggestion would be to stay with OEM parts especially for the HEUI system. I have a removal, cleaning and refitting video here if you need help: ua-cam.com/video/YU2D6GRu51U/v-deo.html Removal Tool - ua-cam.com/video/23FeL4IW7C0/v-deo.html Here is Ibrahim's email if you need parts from Ramin Auto Parts in Dubai - raminaut@emirates.net.ae The RPCV Isuzu Part Number is - 8971748720 Control Valve Rail Pressure The following is taken from the Isuzu Workshop Manual in sections 6E-54 through to 6E-92 If you have a TECH 2 tool the typical values at idle should be 17 - 22% and 18-27% at 2,500 rpm Furthermore, here are some relevant ECM Diagnostic Trouble Codes: P0192 - Rail Pressure Sensor Low Voltage P0193 - Rail Pressure Sensor High Voltage P1193 - Rail RPCV Circuit Open/Short P1194 - Rail Pressure System Low Voltage P1195 - Rail Pressure System High Voltage P1196 - Rail Pressure System High Warning DTC codes can be cleared by using the Tech 2 “Clear Info” function or by disconnecting the ECM battery feed. I hope this helps you
No fancy tools required at all, but if people feel more confident using a specialized tool, then I say go for it.
Personally, I use a 1 & 1/8" Open end Ring spanner, (a cheapie off eBay that I put in a vise and give it a slight bend a few inches up from the ring end - that allows it to go around the HEUI Pump. A 3/4" or 19mm Open end spanner allows you to remove the retaining nut, then the spacer & Solenoid can slide off to give you access to the RPCV nut (1& 1/8"). But you first need to remove the 17mm Acorn Nut from the Fuel Feed Banjo and move the banjo back towards the firewall so that you can access the 3/4" or 19mm nut on the back. My first step is to undo the 10mm bolts that hold the Heat shroud around the Fuel Filter, and the other 2 x 10mm bolts that hold the Fuel Filter Primer housing in place, lift up the filter and rotate it upside down towards the firewall so it's out of the way. Then I undo the vacuum lines between EGR valve and VSVR.
Seriously, it takes me less than 15mins to remove the RPCV, 10mins to clean it, and 10 mins to put it all back together again. Not a big job after doing it 100's of times on many vehicles over last 8+ years.
I'm all for people making their own tools but, this channel is for the people who aren't able to make their own tools, thanks for your pointers.
Thanks...good to know and thanks for the link for FourJxone jackaroo.
You went over it in the video, but I guess there is a relationship with the ORPS...I guess the ECU reads the ORPS (amongst other readings) and controls the RPCV accordingly?
Yes, that is correct. The ORPS reads the Oil Rail Pressure and sends it to the ECU which controls the pressure via the RPCV.
Hello, can you tell us in detail the principles of operation of this valve?
I cannot tell you exactly what the principles are because this being an Isuzu engine and the RPCV being a Caterpillar valve, I can only pass on what the Isuzu manual tells me. However, your local caterpillar dealer may be able to pass on some further information.
The RPCV is located in the back of the HPOP High-Pressure Oil Pump and is part of the HEUI injection system. The RPCV's job is to regulate the oil pressure being fed to the injector rail. The ORPS Oil Rail Pressure Sensor reads the oil pressure in the rail and sends the information back to the ECU which in turn regulates the pressure via the RPCV. The RPCV has a coil like device which magnetically controls a piston inside the RPCV which opens and closes a small valve to regulate the pressure.
There are several issues that can affect the operation of this valve the primary being the piston sticking due to dirty or incorrect oil viscosity. The valve can be bent upon removal which also causes the piston to stick in its housing. If the valve cannot control the pressure for whatever reason, it results in rough running, no acceleration and perhaps no starting at all.
I tried to purchase a RPCV in Australia and Isuzu could not help me but that was because of a deal that Isuzu had with GM. GM wanted a ridiculous amount of money for the part but didn't have any. I sourced one from Caterpillar directly at a much better price but they were limited. If you live overseas, you may be able to purchase one from Isuzu or try Ibrahim at Isuzu Dubai. A word of warning, these valves were fitted to several engines including Ford's, International and Caterpillar and as a result, there are a lot of cheap knock offs on online auction sites. You are taking a huge risk purchasing aftermarket valves, some work some are useless. My suggestion would be to stay with OEM parts especially for the HEUI system.
I have a removal, cleaning and refitting video here if you need help: ua-cam.com/video/YU2D6GRu51U/v-deo.html
Removal Tool - ua-cam.com/video/23FeL4IW7C0/v-deo.html
Here is Ibrahim's email if you need parts from Ramin Auto Parts in Dubai - raminaut@emirates.net.ae
The RPCV Isuzu Part Number is - 8971748720 Control Valve Rail Pressure
The following is taken from the Isuzu Workshop Manual in sections 6E-54 through to 6E-92
If you have a TECH 2 tool the typical values at idle should be 17 - 22% and 18-27% at 2,500 rpm
Furthermore, here are some relevant ECM Diagnostic Trouble Codes:
P0192 - Rail Pressure Sensor Low Voltage
P0193 - Rail Pressure Sensor High Voltage
P1193 - Rail RPCV Circuit Open/Short
P1194 - Rail Pressure System Low Voltage
P1195 - Rail Pressure System High Voltage
P1196 - Rail Pressure System High Warning
DTC codes can be cleared by using the Tech 2 “Clear Info” function or by disconnecting the ECM battery feed.
I hope this helps you