Date: Sat, 11 Oct 2003 10:07:58 +0200 Subject: Re: [DTLC] BJ or HJ? From: "Dominic von Stoesser" To: dtlc@helios.net Reply-To: dtlc@helios.net On Saturday, Oct 11, 2003, at 03:02 Africa/Johannesburg, Rob Lassman wrote: > Otheres will tell your the achilles heal is the rotory fuel pump and if any > low quality fuel passes by the filters the pump is finished. I have a couple of pennies to add on the "rotary fuel pumps are bad" note: I drive a 1995 HZJ75. It's my almost-daily-driver (shares that duty with my Uri), and has been through 200,000km of poor diesel, poor roads, poor lots of things. I change the fuel filter out without fail every 5000km, same with the oil and oil filter. Sometimes even that isn't enough, considering some of the less than ideal fuel sources I sometimes have. I once had a tankful of diesel (from a farm) that was so bad that the particulate contamination essentially gutted the filter. We found, when checking the rotary pump (routine adjustment as the engine was idling a little rough and the power was a little low) a piece of metal from the farmer's fuel storage tank lodged against one of the outlet valve thingies in the pump which had caused that cylinder to run very poorly, if at all. The piece of metal was removed, the pump was adjusted, certain minor but important components were replaced, the pump was put back on the engine, valve clearances were adjusted, timing was fine-tuned and adjusted for mean elevation where the cruiser operates, and the engine ran as good as new. Because it's a Land Cruiser, it's fine. The rotary pump is a whole lot tougher than people think. Cheers - dom From: "Dana Adams" To: dtlc@helios.net, kavandje@gmx.net Subject: [DTLC] Rotary pumps and filters Date: Sat, 11 Oct 2003 15:29:52 +0000 Reply-To: dtlc@helios.net Dominic wrote: >I once had a tankful of diesel (from a farm) that was so bad >that the particulate contamination essentially gutted the filter. Dominic, have you looked at the Racor filters? They make a fabulous "turbine" style fuel filter that would have worked wonders in your situation, it's available in 3 physical sizes. I just put the 500FG on my HDJ80, it fits quite nicely. The fuel is forced to "spin" as it exits into the bowl, thusly forcing off larger particles into the fuel bowl, then it is forced upwards where it contacts a cone-shaped structure, this will cause any smaller water droplets that haven't already been separated, to stick to it, where they coalesce and drop to the bottom, and only then is the fuel forced into the filter element. By that time, most of the larger pieces of junk are sitting harmlessly on the bottom of the fuel bowl where they can easily be drained off. The bowl is clear, so you can see any junk at the bottom. The filter elements are a breeze to change. there is a T-handle at the top, you unscrew this, lift off the top, and the element lifts out (it has a small handle attached to it), pop in a new one, bleed, and you're done. They are also quite inexpensive, and come in three filtration levels. Check it out, I'd bet you'll find it will be a significant improvement over the factory style filter. BTW, the Bosch VE-style pump (the Denso rotary used on Toyota diesels under license from Bosch) is a very common design used on many diesel engines worldwide, including Cummins as well as tons of other Japanese engines as well. If you keep the fuel clean, they are just fine. Dana (doesn't work for Racor). From: "Dana Adams" To: dtlc@helios.net Subject: Re: [DTLC] 1HD-T, 120k Miles, smoking on acceleration Date: Mon, 06 Sep 2004 18:20:32 +0000 Reply-To: dtlc@helios.net >Hi Dana, > > > Good luck > >Thanks. > >I will hunt around for a local firm to get the injectors checked. > >At this stage not overly keen on ripping the pump out, but will >consider it after I have checked everything else, including the timing >and the fuelling which I will do myself. > >BTW - I was reading a post in the archives about your fuel filter setup >(to go with the Walbro pump 'upgrade'), but have lost the post >somewhere. Any chance of you letting me know what filter you are using >- it sounded ideal. >-- >Regards, > >Julian Voelcker >Mobile: 07971 540362 >Cirencester, United Kingdom >1994 HDJ80, 2.5" OME Lift, ARB Hi Julian. I'm using the Racor FG500. It's a turbine style filter that swirls the fuel at the bottom of the bowl. The centrifugal force will seprate out a lot of the dirt and water and send it to the bottom before the fuel gets to the filter, hence prolonging the filter life. I use a single filter, 2-micron in size, for maximum filtration. Probably the ideal setup would be a dual-filter setup, one 30-micron, then the final 2-micron. You will have more room on your truck than I do, because you have RHD. I've got space on the rt side firewall, but the exhaust heat prevents it from being mounted there. On my left side, I've got brake booster and steering column in the way. Not so you. My filter is mounted above and in front of the left-front shock, on another shock mount that's bolted onto the main shock mount. Works fine. The FG500 is the smallest of 3 sizes that Racor makes of this style. The filter element is very easy to change, no tools needed. BTW, if you haven't done the Walbro upgrade yet, do it. You'll never have to prime your system, and you'll get maximum power because of adquate fuel deliver to the inj pump. If you need any help or suggestions, let me know. Actually, since you mentioned a lack of power, you may want to plumb in a mechanical fuel pressure gauge, right at the pump inlet, in such a way that you can observe it from the cabin. Then take the truck for a drive, and observe the fuel pressure at inj pump inlet while holding the engine at 3500 RPM under maximum load. If you dont' have at least 2psi there under those conditions, you're pump is starved for fuel. This can cause it to retard the timing, causing smoking issues, and low power and poor fuel economy. Maybe you want to run this test before you get into anything else. HTH Dana