Onan Coolant Drain Plug?

[lonestarace]

Hi All:

I'm trying to drain, flush,and replenish the Onan cooling system. The coolant drain plug in our 1999 HDCAA 10kw Onan won't come out? It turns, but doesn't loosen? It doesn't leak either? I have the parts, operators, service,and Isuzu workshop manuals for it. They just say "remove the drain plug"?

I believe somebody may have over tightened it. It calls for only 5 ft Lbs of torque. The parts manual shows the drain plug with an o-ring that goes directly into the radiator. If the radiator threads are stripped, wouldn't it leak?

What am I doing wrong?

Thanks in advance

Don

[GaryKD]

Hi lonestarace,
If it were me, I'd leave the plug alone. Taking it out may be more trouble than it is worth. Can you pump out the coolant from the fill opening?

[lonestarace]

Hi Gary:

Your probably right.

I'll half to come up with another way to drain it. Maybe take a radiator hose lose? I'll get back in the manuals and see what I can figure out.

[supercub]

When you have a tough nut or bolt to unstick.........I'll share a little mechanics secret with you, that frequently works........try tightening first. If you're able TO "BREAK IT LOOSE".....then back it on out, believe me, it works.

[lonestarace]

Thanks, yes I know that trick.

The drain plug is not stuck stuck. It will move cw or ccw with about 20 Lbs of torque. I'm afraid if I keep dicking with it it will start leaking then I'll have a real problem. I plan to pull a radiator hose off.

[RJay]

I thought the saying went, "If it ain't broke, don't fix it."

[Bob86ZZ4]

I'd loosen the hose and try to get as much coolant out. Then I'd seriously look at how much trouble to remove the radiator. If you can get the radiator out you could take that to a radiator repair place and have them fix the drain properly. They could clean it out in their acid tank too and get it working real good.

[lonestarace]

Bob86zz4, our summer traveling starts this week.

When we get a break in the action, we'll do a proper fix.

[Bob86ZZ4]

Aaahhhh, okay. Have fun, I wish I was heading out soon.