sullair 85 volks compressor problems
- Thread starter edbatt
- Start date
Mursal
Member
Compressor unloaded, its not killing the engine?
Take the plug out and pour in half a cap full of fuel, replace plug and see will it rev out while it burns the extra fuel? If so, its a blocked jet in the carburetor. Also try without air filter .....
If it wont run "different" with the extra fuel, more likely spark.
Also check for fuel filter on fuel pipe or in the tank on the end of the pipe.
Take the plug out and pour in half a cap full of fuel, replace plug and see will it rev out while it burns the extra fuel? If so, its a blocked jet in the carburetor. Also try without air filter .....
If it wont run "different" with the extra fuel, more likely spark.
Also check for fuel filter on fuel pipe or in the tank on the end of the pipe.
im not to sure how to unload the commpressor , in the manual it says to crack open service valve a little on start ups and plugs are sparking good, and initially we were pouring into carb and it fired up, and once it got its prime it only runs on fullchoke for a max of 10-15 secconds also while moving the throttle linkage , and the carb is out for the third time lol and seems all the ports and jets are still clean from the first and second clean up, so from the second clean up its still clean, only the firsst carb clean was gunky thats whhats got me wondering wth lol
- Location
- East Sussex
Plug broken down and not sparking under compression/heat or the coil doing the same.
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Got to be be either juice or spark. Have you drained the tank, run some fresh fuel and new filters on. Blow the fuel lines through. Points on distributor ok? Plugs clean and gapped. As mursal says run it with the air filter off.
Mursal
Member
I'd open the compressor outlets fully, or block the intake to it.
OK I only now copped its a VW Beetle flat 4 engine (hence the Volks).
Check vacuum advance pipe going to inlet manifold from distributor for leaks, if it has vacuum advance?
Take the distributor cap off and with your hand rotate the rotor against spring pressure, it should kick back into place when you let go? Do it a few times, if its sticking, take the rotor off and oil the centre of the distributor shaft, you'll see a felt like sponge.
Top Dead Centre mark on front pulley, line it up and see if the points are just opened or just about to open?
But why does it stop after 10 seconds, tank is very low, consider giving it a new tank just to test above the carburetor height. Preferably outside with fire retardant handy.
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Do you reckon it’s gravity fed or a mech lift pump?
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Good old YouTube.
Points...
Timing...
Carb...
Points...
Timing...
Carb...
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
These must be a similar vintage to the OP's...
got it running had to adjust all the valves some guy set them up so they were pertty tight, was back firing and hit a missing lol but got it running now but whoever had it rigged it up oddly and have no idea on how it revs up when loaded and idles when not under load cause some of the carb linkages dont seem to be doing anything kinda guessing on it now in the book it says diffrent applications have diffrent setups on the carb so i have no idea on hhow this one is settup or am trying to figure it out lol
looks to be exactly the same would u be able to take a picture of the left and right sode of the carb so i can get a idea on how its rigged up few parts were "to be put on"
I'd open the compressor outlets fully, or block the intake to it.
OK I only now copped its a VW Beetle flat 4 engine (hence the Volks).
Check vacuum advance pipe going to inlet manifold from distributor for leaks, if it has vacuum advance?
Take the distributor cap off and with your hand rotate the rotor against spring pressure, it should kick back into place when you let go? Do it a few times, if its sticking, take the rotor off and oil the centre of the distributor shaft, you'll see a felt like sponge.
Top Dead Centre mark on front pulley, line it up and see if the points are just opened or just about to open?
But why does it stop after 10 seconds, tank is very low, consider giving it a new tank just to test above the carburetor height. Preferably outside with fire retardant handy.
and yeeah for this machine i got here i really dont get it it only has a choke cable, and for the linkage that was on it it was on the opposite side of the carb when i got it, so all i can really guess figure is that there is a secondary cable to lock the lobe on the carb to idle and when it warms up let lock cable loose to hit the governer and run at rpm.
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Sounds like it’s been seriously fiddled with, and not in a good way.
Can you take some photos around your compressor, particularly around the carb linkage and governor/feedback linkages?
Possibly quite a different setup to most diesel road tow compressors which, once they’re put on load, will freely adjust their revs based on air pressure feedback, there’s no manual rev control. They simply have a rotary screw type compressor with an unloader valve (throttle body) on the intake side. You can only load or unload them.
Yours reads like it has a manual throttle control, which should hold the throttle in the desired position with a spring linkage back to a governor to pull the engine back to idle once full pressure has been reached. Kind of like a petrol reciprocating compressor - it’s either full (set) revs or it’s pulled back to idle.
Sounds like it’s missing the linkage then to pull it back to idle at full pressure.
Mursal
Member
Sorry no other images I got that on here sullair 85 volks compressor images click
At least your getting somewhere .........
Not sure, think they might of had a mechanical pump, in the cars?
At least your getting somewhere .........
Not sure, think they might of had a mechanical pump, in the cars?
mech fingerr pump
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Sound like you've got it running, so scratch my thoughts about whether it was the fuel pump at fault.
Just thinking about "idle control" feedback to the carb, does the compressor have any sort of tank/receiver on it or any sort of valving from the air end, or are there simply air shut-off tap(s) straight out?
Just trying to picture it in my head.
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Could be just the one cable to the throttle butterfly and choke, with an intermediate linkage that applies the choke whilst main throttle is wide open. Kind of like a combined throttle and choke lever on a lawnmower. You still need another separate linkage acting on throttle from the governor/air pressure control. Someone might have stripped it all off in an attempted repair.
What vintage is it?
the service line has a valve water seperator, then the oil seperator everything is tthere for the compressor end , my thoughts are hold it at idle to warm up then after that let the cable loose to let the governer kick in would that build up pressure or is there someth9ing else im missing, and really new with compressors lol and it is the crappy part that it was messed with im left with lots of figuring lol
thats what im thinking that one cable might do both jobs but yeah some person might have that linkagee in there shop 500 miles away lol and thee linkage for the throttle and governer is there so i am making somme headway lol see what happenss today