I have a Tennant ride on floor sweeper with a 1.6 GM engine. it wont run more than a few seconds, then backfires. Sounded a a worn camshaft or jumped timing belt. did a compression test with all plugs out and open throttle valve...all 180 except for one at 165. I eliminated all external causes by swapping known good parts from another sweeper. The coil, wires, mixture control and the fuel cut-off, all control valves, crank shaft position senser and even the ECM. Ive removed the cover to check timing belt and verified its all good. Even removed the timing gear and balancer to check if they spun..all good. All valves open and close with good travel...lobes all perfect.
looking for a manual..maybe monday.
anyone have any other ideas.....
Showing items 1 - 15 of 18 results.
I have the same engine in a tenant do the same thing, so what was it actually? The plugs on the manifold where the injectors go? The epr? Diaphragm?
Bigfleettech, yes fix was never posted! It bugs me when I see so many posts with answers to questions but no follow up. I left that place for a road job soon after the post. The other tech called the tennant guy, and found one plug under the intake manifold blown out, like someone else pointed out here.
From all the back firing the mixer had to be changed. BTW, I was able to buy a lot of parts from GM, like timing belt and water pump without waiting on tenant.
Have a machine doing the EXACT same thing now. Puzzled as to what is wrong. What did you figure out on your machine?
The issue with this machine I believe is quite simple. The intake manifolds on these machines are originally designed for fuel injection. When they are converted for LPG they quite obviously do not need injectors so they are removed and plugs are fitted into where the injectors would normally go. What happens is, if you get a backfire it blows one or more of the plugs out. that I believe is the issue, check the intake manifold and when you find out which one is missing you need to block that hole up, it's quite simple.
come to think of it after reading some of these other posts and remembering a situation i had not long ago, i had a genie rough terrain truck with a ford engine in it with a nolffs lpg control that did this very exact thing. All it turned out to be was the diagphram in the mixer was defective. It ran me around in circles for a day or so before i figured it out. Once i replaced the diaphram it ran fine.
just a thought to ponder...
I agree that you may have an overfueling issue. That is likely caused by a worn out primary (liquid LPG inlet) valve in the LPG section of the Spectrum EPR.
Rebuild kit for EPR low pressure regulator.....Impco part # RK-EPR-3
Low pressure regulator assembly.....Impco part # RK-EPR-4
I agree that you may have an overfueling issue. That is likely caused by a worn out primary (liquid LPG inlet) valve in the LPG section of the Spectrum EPR.
Rebuild kit for EPR low pressure regulator.....Impco part # RK-EPR-3
Low pressure regulator assembly.....Impco part # RK-EPR-4
well that`s something to try snowmonkey,..... waiting on a mixer now. This is a 6600-26379 2008 tennant sweeper. Tennant would not sell the Manual last year but agreed this year. It`s on its way now.
the mixer problem we have established (backfire damage) sounds like a byproduct of the original problem which still sounds like an overfueling issue. however the cylinder @ 165lbs may be a cracked valve , attempt to start on three cyls (remove one plug wire on each attempt see which one if any will alter your missfire condition) but i would not go there untill you are sure about that vaporizer
The engine is marketed as a Power Solutions Inc. product.
The Service Manual you need is PSI1P6LPF1-A (provided that the version of engine you have is a Tier II Certified Engine).
What model of Tennant are you working with?
All valves springs look good. Same rise and fall height. Both fuel systems on each truck are the same with identical part #s. The back fire through intake seems like timing. Monday i'll try the new mixer then un-hook the exhaust..
Does this sweeper have the Impco Spectrum Electronic Fuel Pressure Regulator?
Is the mixer an Impco Model 60?
Are both sweepers identical regarding fuel system?
I ask because the Model 60 mixer comes in 2 versions.
Version FT60M-3 is for engines having the Spectrum EPR
while version CT60-3 is for engines without the Spectrum EPR.
The mixer was swapped with a good running truck and the engine runs a few seconds then backfires. If I install the mixer from the faulty truck onto to good truck, it wont run. I`d say the mixer was blown from the backfiring. I need a new mixer for sure but the engine still has a miss and backfires. the only thing I didn't do was unhook the exhaust and try it. Possible blockage....an engine will start with a blocked exhaust but snuff out soon after...and backfire through intake. will try tomorrow.
just wondering if the hyd valves are not opening enough...would that cause backfire...
you do not mention examineing mixer (cracked /broken fuel ring /dirty) also could be excessive vaporizer pressure (extreme overfueling)
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