oil burner nozzle drip

carbro

I have a Wayne model MS-R burner (circa 1987). The nozzle is a Hago 1.1 gph, 80 degree cone with hollow spray pattern.

After replacing the oil filter and nozzle for the coming heating season I noticed the following:

About 10 seconds after the burn has ended a few drops of oil drip from the nozzle. I don't recall this happening in the past.

I tried replacing the nozzle with a Delavan nozzle with a protek check valve but the same drip occurs.

The nozzle adapter is a anti drip type and appears to be OK.

After a few drops come out the dripping stops.

I read that air in the oil can cause this problem. Can air get in a fitting that appears to be tight (no oil seeping around threds)?

Any suggestions?   Thanks

Big Ed_4

After Drip

Is the oil supply system gravity feed ? Buried tank , two pipe system or a top feed off the top of the tank ?



Gravity feed ... Any vacuum reading when burner running ?

meplumber

Nozzle after drip

I would also be interested to hear your answers to Big Ed's questions.

You are correct that air in the nozzle line can cause after drip.  Also, excess heat in the chamber is the likely scenario since it occurred after you installed the delavan with the check valve.  When you changed the nozzle and filter did you also vacuum out the passages and clear the soot from the chimney connector?

If this is a direct or power vented unit then that poses another round of questions.

carbro

answers to questions

The oil supply is gravity feed (spigot is on the bottom of the tank). I haven't checked to see if there is a vacuum when the burner is running. I will do that.

Yes I cleaned the heat exchangers and the chimney connector.

I also replaced a suspect compression fitting (this evening) I'll check vacuum and evidence of a drip tomorrow.

Thanks for the help.

CapeCodOilGuy

nozzle drip

I can think of two possibilities. I recently had this happen after a cleaning/service; oil line comes from bottom of tank, goes up to ceiling, then down to burner (one-pipe system). It took a while to get rid of all the air, and until I did, I had after drip and smoke. Should I run into that problem again, I'll probably recommend the installation of a Tiger-Loop®. Another possibility; did you check the fuel unit for shutoff? If you have a poorly seating pressure regulating valve, after drip is likely to be a problem. You know the drill-install your pressure guage, assuming 100 p.s.i. operating pressure, the pressure should drop to 80 and stay there when you shut off the motor. If it leaks down, this may be the source of your problem.

CapeCodOilGuy

nozzle drip, cont.

Forgot to mention-I also discovered that I hadn't snugged up the securing bolt on the fuel filter quite enough. Not dripping fuel, mind you, but just loose enough to admit air to the housing. If you have a loose fitting, you won't necessarily see a mess (at least right away...)