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Rumcajs

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Rumcajs last won the day on September 22 2018

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About Rumcajs

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  1. Rumcajs

    ZD30DD diesel pump

    Sorry to hear about that. To answer your questions: 1. No the extra lift pump will be/should be installed before the fuel filter cause they're better to "push" the fuel than pull, it that is their primary design..... 2. Yes spill/leak off pipe returns excess fuel back to fuel tank or back to suction side of the IP side, depends on the design chosen. Nissan Patrol ZD30 implementation is to return the spill line to the suction side of the IP pump cause inbuilt vane lift pump( which is itself dreadful design cause it requires higher RPM to increase the flow rate) Thats why We have to re- route it to return to overflow side of IP fuel return line when using external lift pump to pressurize what was suction line which would ruin the spill line workings. The good old design is to return spill line to fuel tank, it improves fuel cooling as well, unless you are in Arctics or similar very environments where it will help heating/warming of the fuel. In hot climates it is a disaster to have. Some designs out there have thermostatic valve which depending on ambient temps re-routes fuel flow from spill line either back to fuel tank (hot day)or back to fuel filter suction line(cold day). Sadly not on Ni$$ans LOL. Be vary that Carter 4600/4601 lift pumps installations require to have as a safety measure bypass built in in case of the pump failure or blockage as fuel starvation will result in IP failure again. Regards
  2. Rumcajs

    Td42 Diesel pump modification

    The injection pump is not a build for back yarder for sure.... As for the turbo, "how long is a piece of string?" You will have to search what is avail in Bolivia. Usual suspects like Garret, Switzer, perhaps KKK or Holset make something you could use. The thing with non turbo injection pump working correctly with the specific turbo is another matter. Regards
  3. Rumcajs

    Cabin Filter

    Those filters are available from Ni$$an stealers, you can also chase ones from Mann and other aftermarket suppliers. Regards
  4. It means tolerances given for each block and crank combination. You will need specs for each to understand the sizes. Something like bellow Regards
  5. Rumcajs

    ZD30DD diesel pump

    G'day, The only servicing required is good quality fuel and regular fuel filter replacement (more often then service intervals from Nissan due to poor quality fuel). Some people try additives in the fuel like diesel treatment types ( I'm not sure what is available in your area) which can be helpfull when quality of diesel is low. I use here in Australia Chemtec Diesel Power I also add two stroke mineral oil in ratio 1:200 (or multiply liters of fuel added to tank by 5 to get the amount of oil to ad in ml) because older Diesel fuel injection system don't handle low sulphur diesel fuel that well so extra lubricity doesn't hurt. As for legality of that thats another matter. So in your case finding additive for low quality/ bad fuel could perhaps be beneficial. There is also a modification to add external electrical fuel lift pump to ensure fuel starvation will never occur because that is one of the main killers of those pumps but there is a modification needed to be done to spill/ injector leak off pipe otherwise the engine will be pumped full of fuel. This apply to Nissan Patrol so I'm not sure how is fuel return from injectors leak off or spill line routed in your vehicle. External lift pump like Carter 4600 series or Walbro 13-2 or better abble to supply up to 12 psi head pressure will improive things greatly but it does require you to understand thing or two about fuel supply on ZD30 and routing of fuel lines/ The injector pump has its own lift supply pump built in but it is hopelessly inadequate especialy at low RPM so bonus is when fitting external supply pump is a slight gain in low down RPM power increase. In that case injectors spill lines is connected straight to suction side of the pump port which means it needs to be connected changed to return line to fuel tank. Regards
  6. Rumcajs

    ZD30DD diesel pump

    Having said all that, checking if all electrical connections to the pump and grounds are good first would be a good start.
  7. Rumcajs

    ZD30DD diesel pump

    Ok, Yours what I suspected, conventional mechanical diesel injection system. Injection pump is Zexel/Bosch VP44 radial pump and what I posted earlier applies. Dreadfull device it is. The link you posted to Ebay is not applicable to your car then. Your mechanic will need to connect special scanner from Bosch directly to pump ECU to read/diagnose the codes which will narrow it down but prognosis is not good. These pumps have fatal flaws and will fail suddenly and without any warnings. If one of the sensors fails for example the entire assembly of sensors and actuators will need to be replaced. Most common failure is actually that inbuilt ECU where its internal circutry is subject to failure due to mostly overheating cause either fuel supply is restricted/compromised. Search "Bosch VP44" isuess your will see.... Those things are ticking time bombs..... Regards
  8. Rumcajs

    ZD30DD diesel pump

    You will need to clarify which version of the ZD30 engine fuel injection is in yours. There are two types with completely different systems and different operation so giving you any advice is conditional upon that clarification. Regards
  9. Rumcajs

    ZD30DD diesel pump

    Well, I'm assuming your engine has what is termed as radial injection pump which is not common rail system. What year is your vehicle? The link to E-bay is for common rail injection system. Is this how your engine looks like ==>
  10. Rumcajs

    ZD30DD diesel pump

    G'day, The ZD30 pumps VP44 from Bosch/Zexel are expensive to fix and repair and made deliberately that way. Welcome to the scores of owners who have been cheated this way. If the engine has shut down chances are the injection pump kaput. These pumps are terrible and most parts in them are replace only. That's why clean fuel and regular attention to injection system are crucial to avoid this fate. I'm sorry but there is no other way out of it your mechanic is right. Regards
  11. Rumcajs

    oil pressure light on

    The usual location of oil switches/sensors on ZD30 ===> Note bellow explanations refer to "common rail " version of ZD30 2007 onwards hovever the location is the same on previous model too. If you only have one than it is the one on LHS image. Which means no resistor either, easily checked by disconnecting the plug when engine run if the light is on it will go out..... Regards
  12. Rumcajs

    Clunk Noise in 4x4 Drivers side

    I'd lock hubs manually first to check. If it is CV then in most cases the clunk would be there only on full steering left or right lock. Personally I'd gut out auto hub lock clutch and be done with it if yours are auto locking hubs. That way it is on only when manual lock is engaged. If you have access to 4 axle stands then raise the vehicle of the ground and "drive" it that way so you pin point the source of the noise. Cheers
  13. Rumcajs

    oil pressure light on

    G'day, The switches are not same, and the resistor is upgraded one. What might happen is that the replacement switch will fail again due to the resistor. That is/was explicit warning on the Nissan repair bulletin. Part numbers: LHS switch ---> 25240-8996E (low side) RHS switch ---> 25240-2X90 (high side) One of the difference is that RHS switch is marked with green circle as well. I tried to swap them around as to what will happen and the oil light will not go out if the low side switch is on the high side! Regards
  14. Rumcajs

    please help 1997 2.8TD problems

    RD28 engine is notorious for warped engine head due to overheating and subsequent coolant loss..... White smoke is usually coolant being burned especially when doing it hot. The blue smoke is usually indication of burning engine oil. Having said that white or grey smoke can be also a symptom of unburned diesel fuel especially when cold due to glow lugs not operating properly. Coolant will leave "tell tale" traces where it leaks so if it is external leak you should be able to find it. If you can that means coolant is leaking in to combustion chamber of any cylinder. What is the engine oil like, does it look milky grey? Anyway, any mechanic worth its spanners would do following ..... Pressure test cooling system both when engine is cold and hot to find external leaks first. May be then start looking inside, take glow plugs out or injectors and carry compression test etc. Regards
  15. Rumcajs

    hand Prime pump/possible air in fuel line question

    G'day, 1. NO, because it is on the suction side and if it only takes several presses and it goes hard then that is normal behavior. 2. Yes, you can have air entering from the priming pump diaphragm Use of injector cleaner create sometimes more problems then it is worth. Did you change fuel filter as well? If you did, it is possible that the filter installation is not correct and it is bypassing the sealing or that extra "O" ring everyone ignores..... Anyway, this is a dreaded fault for anyone "lucky enough" to own vehicle with that abomination made by Bosch the VP44 radial injection pump. What you should really do is to check ICV % via Nissan "datascan" or ECU talk software and Consult cable while engine is running. Anything less then 35% duty cycle at idle indicates issues with fuel delivery to the pump. It should be around 50%-70% under load and on deceleration even higher. To identify issue with air in the fuel is very difficult. You will need to ensure that fuel lines are sound including steel lines and pick up in the tank. That's why it is essential to be able to compare ICV% values/readings as you perform diagnostics. * Change fuel filter in case it is blocked with what cleaner has created and bleed the system thoroughly first if you can. * Check/Decide if running new fuel lines and hose clamps might fix the issue *If problem persist create/make temporary clear see through fuel lines/hoses running from the pipe in the chassis to the filter and from filter to the pump so you can visualize what air if any is coming in. * if still there run the lines from spare jerry or bucket filled with clean diesel fuel to eliminate fuel lines leading to fuel filter depending on above step. * Depending on the outcome of previous checks try another fuel filter housing to eliminate priming pump diaphragm if the air in the fuel is still present. * If the problem persist it is possible that the injection pump is failling and the big bill is coming your way. If you have access to compressed air and are handy with creating temp blanking plugs then I'd disconnect the fuel line from the injection pump, blank its end and then disconnect line at the tank and pressurize the line with max 75-85 kPa and check for air leaks. That will tell you quite quickly if there is an issue with the tightness of the system. Also don't discount possibility for fault in the electrical harness on the pump. Good luck
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