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Old 08-20-2011, 12:09 PM   #91
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Re: G Bus Progress

hope it is an easy fix guys!
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Old 08-20-2011, 05:38 PM   #92
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Re: G Bus Progress

Change your veggie filter. All new conversions plug filters early + easily. Throw a section of clear hose in the system to look for air leaks (bubbles) Veg isnt THAT super hot-or cleansing that it took out your pump--i'd bet money on it. And theres no way all your injectors died at the same time-you'd feel a cylinder dropping here + there-not just a steady loss of power.
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Old 08-21-2011, 12:59 PM   #93
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Re: G Bus Progress

Well thanks for all the suggestions and the junkyard tip on bus parts!! i may call up there if i need some parts or whatever, i did call and get a fuel line shipped from where I bought it in VA.

I did use a brand new filter to leave town with and even though i doubted it was plugged i changed it with another brand new filter filled with diesel. I also ran it from a bottle filled with seafoam (two bottles) and did a H2O injection, to clean the pistons and the valves in case they were sticking. I also have no exhaust and removed the air-filter and added an electric boost pump before the injection pump and later tested the incoming fuel pressure and found it adequate. all these tests came back fine which led me with only the pump or injectors as a possible suspect. (I have re plumbed the fuel system to place everything under pressure instead of vacuum and the problem was not an intermittent thing so much, i have had air bubbles before... I also had no trouble during test runs and the first 80 or so miles of the trip at 55MPH)

I dont think the WVO created a problem, i think it tipped the scales on a stop-and-go marginally maintained 21 year old motor and pump. Believe me i would rather have an engine that had run 50 miles a day than one that only drove 10 and had long periods of idling and many stops and starts. I got the latter. A Richmond city bus. that has 67,000 miles and 160,000 hours on it. I think that means an average speed of 23 miles and hour. i suspect no lubricity or cleaning additives were used during its long service life and i bet the WVO has lowered internal pump pressure or clogged either the injector orifices or the tiny filters that may be in them.

I am going to remove the injectors myself and have them tested at a fuel shop for pressure and pattern, and then remove all the fuel lines and clean them and possibly remove the IP for testing and a rebuild if needed. I hope it is the injectors and i sure hoped then and do now hope the Injection Pump itself is ok but in reality the engine was always a little weak at hills, becoming slower off the line, and did have a bit of an off note in the exhaust like a quiet Dud Dud Dud Dudd. at idle and on acceleration. it could be delivery valves, an internal O-ring or seal or a blocked passage inside the pump.


seeing now that some people are interested I will continue to update as i can, but now i am looking for a new car, still working on the jet ski for the end of summer, finishing grad school, planning a wedding, and riding mopeds so this may take a little while.

My tow vehicle and the bus parked at Triple T
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Old 08-25-2011, 08:39 PM   #94
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Re: G Bus Progress

i got the injectors pulled the other day and now they are all cleaned up and sitting in a jar of carb cleaner. they were absolutely disgusting and many of the holes were totally blocked with carbon build up.

i am still going to pay to have them checked and i will clean out the bores with a brass brush and carb cleaner. if they all pop-off pretty close to each other hopefully when I put them in it will be problem solved.
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Old 12-12-2011, 10:15 AM   #95
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Re: G Bus Progress

well I ended up cleaning them all myself. it was fairly easy to build the injector puller and pop them out myself, then cleaned all the tips as they looked like tiny volcanoes had erupted, they had carbon caked over the tips and only two or three holes were visible (out of six per injector) knowing that the "tips" are VERY particular and angles along with size are very important I think this buildup could have very likely been the cause of my slowdown, haze, and poor performance in general. So I put them back in, fixed one compression leak, brought the battery home and charged it, found the ignition short that was keeping the key from turning the power on, bought a new can of starting fluid, and got down to buisness.
After about a half hour of pumping the primer/turning it over/checking lines for fuel and "bleeding " them out it finally fired up!!!!!!! ran on its own, idles normally (a little high) and revs quick and dirty!!!
While I was stopped on my way home the last time, I turned up every fuel adjustment in an attempt to pick up the pace. So it was "hangin up" or holding at high RPMs when revved when I got it started after the cleaning. this means it was very close to running away or just continuing to accelerate until something breaks. when this happens there is only a couple of things that can be done to save the engine and i wasnt prepared to do any of them.
So i went to the back to turn down the smoke screw and the full fuel screw and what did i find? a HUGE coolant leak!!!!

Luckily the testing and idle process had warmed up the bus enough that the thermostat opened and collant started to flow, this finished off the short heater hose with a leak in it that pumped maybe 1 or 1/2 gallon of the green stuff into the belt and the ground and sprayed all over also. We shut it down and now I have to get a new short hose and adjust all the fuel settings to get it into a safer range.

I do believe that my injector R+R did something because I certainly didnt rev that high or roll that much coal before when I had the settings the same, what i changed was cleaning the injectors so hopefully that has solved the mystery of the breakdown and i can be back burning vegg. post hast.

Here is the "proof" that she is back running again after the long park.
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Old 12-12-2011, 11:32 AM   #96
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Re: G Bus Progress

RJZ, you certainly are mechanically adept. It is always nice to diagnose a problem and fix it yourself.

My engine (Cat 1160) is almost 39 years old. Fortunately, all I have had to do to it is replace the fluids, filters, and lower radiator hose, lifter pump, and put a bolt in the donut gasket of the exhaust.

I have a friend who was doing the WVO fuel in his diesel motor. Perhaps he was not well schooled in what is entailed in successful usage of that stuff as fuel. Using WVO pretty much ruined his motor.

I have no intention of going that route. First, it sounds like a lot of hassle finding the stuff. Second, it seems like a lot of work to process it.

I'll just stick to diesel fuel.

Anyhow, I admire your tenacity when it comes to working on your motor. I would be afraid to take apart all those lines and injectors. It was a major scare for me to remove and replace the lifter pump on my engine. I did do a detailed explanation of that job on my thread.

I am glad to hear that your bus is now working well.
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Old 12-12-2011, 11:10 PM   #97
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Re: G Bus Progress

Thanks for the Props, and I too need to replace a gasket, my turbo drain tube is leaking a little oil into my exhaust. But it hasn't run since august as I have been busy with other stuff, so I will definitely have a "tidy up day" and get to all the little thing like making a support cable for my exhaust and tightening up the tank for the WVO and whatnot.

Accordion I really enjoyed reading your very detailed write up on your bus build and adventures, including the fuel supply shenanigans, and as far as getting in to deep on the motor I have built up an arsenal of experience starting with my first oil change on my first car and most recently I pulled the harmonic balancer and radiator from my fiances car to fix damage from broken bolts and a front end collision, so it is just taking small steps and making progress as far as what i am willing to take on. Plus I am Cheap as hell, so when i understand what needs to happen i wont want to pay anyone to do it anymore.

My time has up till now been very inexpensive as i have been a student with a bit of free time to wrench.


I did fix the leak of fluids and turn everything down fuel settings wise today and take it for a spin at the storage place. Seemed to be much more behaved and smoother than before, I still have to make some more adjustments and take longer test runs before ill call it fixed. But progress......


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Old 05-11-2012, 10:30 AM   #98
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Re: G Bus Progress

So after that test run i did find coolant running down the block, again!!!!! this time it was the water pump, got that switched out but still seems pretty dang slow.

SO my brother in law is sending me some gauges, pyrometer, Boost, fuel Pressure and Fuel temp (for WVO) so hopefully ill get those plumbed in and hooked up and i can find out what the heck is the problem with the big slowdown, once I know I can fix whatever the problem is and then start making some performance boosts and still keep an eye on safety.


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Old 05-30-2013, 06:50 PM   #99
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Re: G Bus Progress

Well small update here. I drove the bus to its new home across the county. 20 min drive. I let it warm up for about 20 minutes before setting out.

It drove OK. last time i was out there I added the last bit of the Startron I had in the bottle probably enough to treat like 40 gallons, so a little strong.

I hit 50mph on the flat ground and it held the speed pretty well on the overpass so maybe it is a dirty fuel related problem.


Next step i think it to pull the injectors (again) and have them pop tested at the local diesel shop. maybe replace or clean them as needed. who knows at this point. I am definitely going to check all my fuel line connections and probably run through that startron that is in the tank before putting in a bunch more diesel.


Hey at least it didn't slow down to 10mph or cut off on me like last time. ....

We may end up full timing it it fairly soon as we are about to put the house on the market. Will update.
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Old 05-30-2013, 07:53 PM   #100
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Re: G Bus Progress

I had to read thru it all, glad to hear she's a running

Good luck with full timing post more pics

Oooohhh and nice to meet you
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