Van's Air Force
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Fuel Injector Cleaning
- Thread starter zman
- Start date
Here's what Don at AFP says:
Don?t sweat this too much. As much as been written on this subject by the ?experts? we find that cleaning the nozzles on a time basis is sometimes unnecessary and can lead to premature wear on the restrictor caused by cleaning with caustic solutions (Hoppe?s #9). Some of this stuff will etch the brass and change the flow characteristic of the restrictor if left in too long. Sonic cleaning works great (that?s what we use). First clean with carb cleaner or ?Choke Cleaner? to get the oil and grease off then put in a sonic cleaner with soap and water works well.
We have found that if the engine is running OK leave the nozzles alone. You can spray off the exterior of the nozzle with ?Brake Kleen? or equivalent to get the dirt and bug stuff off the shield and screen, then just blow off with compressed air. You don?t even have to take the nozzle out of the head of disconnect the nozzle line to do this.
More importantly during your condition inspection clean the fuel filter screen on the inlet side of the boost pump, clean and inspect the inlet screen in the inlet of the fuel control unit, inspect the nozzle lines for security of the clamps and inspect the braze joints where the nozzle line goes into the cone at each end of the nozzle line. Also don?t forget to check all the cable connections and the lever connection at the appropriate shaft. Make the teeth on the levers are engaged properly and the lock nuts are secure, and cotter pins are installed where required. Make sure that all screws are re-lock wired if screws were removed for maintenance or cleaning of components. Check flow divider hoses/ fittings, purge valve fittings, lock wire etc.
If you do decide to remove the injector nozzle for cleaning, make sure your ?? deep socket is broached deep enough so that the nozzle shield doesn?t get messed up. And be sure that if you had done nozzle tuning that you make record of where each nozzle is installed. Serious damage to your engine can result if you mismatch tuned restrictors in the wrong cylinder.
Don
So it sounds like a bad idea!
Tim
Don?t sweat this too much. As much as been written on this subject by the ?experts? we find that cleaning the nozzles on a time basis is sometimes unnecessary and can lead to premature wear on the restrictor caused by cleaning with caustic solutions (Hoppe?s #9). Some of this stuff will etch the brass and change the flow characteristic of the restrictor if left in too long. Sonic cleaning works great (that?s what we use). First clean with carb cleaner or ?Choke Cleaner? to get the oil and grease off then put in a sonic cleaner with soap and water works well.
We have found that if the engine is running OK leave the nozzles alone. You can spray off the exterior of the nozzle with ?Brake Kleen? or equivalent to get the dirt and bug stuff off the shield and screen, then just blow off with compressed air. You don?t even have to take the nozzle out of the head of disconnect the nozzle line to do this.
More importantly during your condition inspection clean the fuel filter screen on the inlet side of the boost pump, clean and inspect the inlet screen in the inlet of the fuel control unit, inspect the nozzle lines for security of the clamps and inspect the braze joints where the nozzle line goes into the cone at each end of the nozzle line. Also don?t forget to check all the cable connections and the lever connection at the appropriate shaft. Make the teeth on the levers are engaged properly and the lock nuts are secure, and cotter pins are installed where required. Make sure that all screws are re-lock wired if screws were removed for maintenance or cleaning of components. Check flow divider hoses/ fittings, purge valve fittings, lock wire etc.
If you do decide to remove the injector nozzle for cleaning, make sure your ?? deep socket is broached deep enough so that the nozzle shield doesn?t get messed up. And be sure that if you had done nozzle tuning that you make record of where each nozzle is installed. Serious damage to your engine can result if you mismatch tuned restrictors in the wrong cylinder.
Don
So it sounds like a bad idea!
Tim
Allen Barrett
Well Known Member
DONT DO IT
Hoppe's 9 will literally eat you fuel nozzles up if left in too long. We never leave them in for more than an hour followed by a soak in clean mineral spirits followed by a good soak in Lacquer thinner.
Allen
BPE, Inc.
Hoppe's 9 will literally eat you fuel nozzles up if left in too long. We never leave them in for more than an hour followed by a soak in clean mineral spirits followed by a good soak in Lacquer thinner.
Allen
BPE, Inc.
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