cessna150pilot
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cessna150pilot
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I am surprised you can bush the acc case; as I recall from when I had the problem no one would do it; can't recall if it was thought to be illegal or technically difficult. And some of my wear was the magnesium accessory case, and there is (was apparently) no way to build that up and resurface it.
Hello, I fly a cessna 150 with a continental O-200 that was overhauled about 2 years ago. A year ago the plane lost oil prime after sitting for a few weeks. The engine shop reinspected the engine, and brought the whole oil pump up to continental standards and seemed to have fixed the problem. Now a year later I have had it lose oil prime again, after sitting for about 2-3 weeks no running. The engine shop is refusing to help me at this time so now I am trying to figure out the best way to re-oil the engine.
Yes losing prime I mean no oil pressure on startup. I'm surprised no one has used the pressure pot to fill the oil pump. The mechanic suggests that it attaches to the front oil gallery. The business that did the work is well respected, do other mechanics here suggest that it's not possible to have bushed this cavity? What do you all recommend
I ran it about 25-30 secs before cutting it. Usually it gets oil pressure in a few seconds. It has been colder her than usual and the plane wasn't run for a few weeks.
Aeroshell 100w. Normal temps around here range 46 low 65 f high this time of year
How long do you let it try to pick up oil? Seriously, I've never seen this happen in an O-200/O-300. Is there a check valve in the system that isn't holding?
No there is not/B]
Even so, if they just went through this pump, I've not seen these pumps not be able to pick up a prime if in good condition. It's kinda weird and makes me wonder if you don't have a crack in an oil gallery.
You might consider joining the Cessna 150 152 type club and posting there. There are some knowledgeable A&P owner pilots over there.
Aeroshell 100w. Normal temps around here range 46 low 65 f high this time of year
do other mechanics here suggest that it's not possible to have bushed this cavity? What do you all recommend
I've read somewhere that the filler neck of the oil sump is above the oil pump. It may be primed by filling the oil up into the filler neck,turn the prop (mags off) by hand then drain excess oil. This may be worth checking out.
I've read somewhere that the filler neck of the oil sump is above the oil pump. It may be primed by filling the oil up into the filler neck,turn the prop (mags off) by hand then drain excess oil. This may be worth checking out.
Out of curiosity, how long can an o-200 normally sit before it will lose oil prime, would it take months ?
I'm not about to run it for 3 minutes without oil pressure, does this not cause damage ?
....then I used the new gears on a new acc. case and pump cover and it was immediately better. =
I'm not about to run it for 3 minutes without oil pressure, does this not cause damage ?
This post has me scratching my head...
I have a C-85 that does this on occasion. I tore the accessory case down and found that the pump cover was poorly aligned to the accessory case as there is no alignment pin system.
I was referring to the oil pump cover piece on a C-85 that is held on with two (no, it is four!) carefully torqued 1/4-20 bolts that screw directly into the accessory case. There is some clearance for the bolts in the o.p. cover that if it is assembled wrong, makes the two gears run on a slightly off axis. The internal wear marks suggested the gears were each contacting on one side only. This makes the face gaps to be tapered.I am wondering how you got the case down over the two big studs, and all the bolts in place with out the accessory case aligned well enough to position the oil pump over the cam drive?
I'm not about to run it for 3 minutes without oil pressure, does this not cause damage ?
I was referring to the oil pump cover piece on a C-85 that is held on with two carefully torqued 1/4-20 bolts that screw directly into the accessory case.
It can be radially displaced by an amount equal to the cover bolt hole diameters minus the bolt(s) body diameter.that oil pump cover is a flat cover, how can it be misaligned ?
Yes but I expected them to be all the way around, not worn on one quadrant only.the pumping gears always leave a run mark on the case or cover. no biggie.
It can be radially displaced by an amount equal to the cover bolt hole diameters minus the bolt(s) body diameter.
Yes but I expected them to be all the way around, not worn on one quadrant only.
Way too many 0-200 will have air in the gauge line, which is a #2 copper tube. So during these cold temps the oil in that line is very cold and thick, and requires a few minutes to move oil up the line and compress the air in the line to show a reading on the gauge.
We all preheat the oil sump/tank/what ever, but seldom do we heat the line.