Low oil presure on rebuilt c90-8
- Thread starter sibbeston
- Start date
Guys
Bad news...
I ran engine yesterday with a new case and nothing changed, start at 60PSI and after 5minutes at 1000 and 5min at 2000 RPM's, oil press went to 18psi with no oil temp indication (i ran engine without engine cowls, and the day was about 23 Celsius).
Tomorrow im gonna open engine, but im sure that my crankshaft and bearings are right (are m10), so what i need to look for?? My camshaft measures??
Thank you!
Hudson
Bad news...
I ran engine yesterday with a new case and nothing changed, start at 60PSI and after 5minutes at 1000 and 5min at 2000 RPM's, oil press went to 18psi with no oil temp indication (i ran engine without engine cowls, and the day was about 23 Celsius).
Tomorrow im gonna open engine, but im sure that my crankshaft and bearings are right (are m10), so what i need to look for?? My camshaft measures??
Thank you!
Hudson
mike mcs repair
Registered User
chugiak AK
recheck oil screen again
Hello Mike
Man, what i need to look for at oil screen?? If contain metal??
Thanks a lot!!
Hudson
mike mcs repair
Registered User
chugiak AK
yes
Ok Mike.
Tomorrow im gonna to check!!!
But for me open my engine is a sure...
Thanks!
Hudson
Guys.
Today was a hard work day...
I look my oil screen and had metal there, so we started to open engine... Tomorrow im gonna clean all parts and next week (maybe on friday, depends if measure shop will can attend me) im sending my engine to the shop to get all parts measured and aligned.
Here the result for today...
Metal on oil screen...
Hard work on it...
Here is cranckshaft without risks or marks, on bearings no risks or marks too... For us, that metal at oi screen comes from oil pump...
Tomorrow im cleaning parts, so i will send more pics...
Thanks!!!
Hudson
Today was a hard work day...
I look my oil screen and had metal there, so we started to open engine... Tomorrow im gonna clean all parts and next week (maybe on friday, depends if measure shop will can attend me) im sending my engine to the shop to get all parts measured and aligned.
Here the result for today...
Metal on oil screen...
Hard work on it...
Here is cranckshaft without risks or marks, on bearings no risks or marks too... For us, that metal at oi screen comes from oil pump...
Tomorrow im cleaning parts, so i will send more pics...
Thanks!!!
Hudson
Attachments
wireweinie
FOUNDER
Palmer, AK
I've got to ask: do you have the overhaul manual for a C-90?
Web
Web
cubdriver2
FRIEND
upstate NY
Was the metal magnetic? Or just Alum? Alum flecks like that are not a big concern on a new overhaul.
Glenn
Glenn
Hello Glen.
I tested the screen today and the majority parts weren't magnetic. I imagine that its part of oil pump, there is some risks there.
Today im gonna go with my shafts and cases to the measurements shop to see how re my case... Bellow the pics...
Other case with the same problem...
My case with no visible damage...
Crankshaft with no damage too...
Attachments
Guys!
I made a cranck case overhaul and adjustments to fit in my cranckshaft measures and oil pump adjustments too.
Today i just finished to assembly the engine and runned it, but was the same!!!!
Its looks like that anything was done on the engine... Idk what to do now...
When its stars, pressure goes to 65psi and 7minutes after is with 20...
My question: in cylinders, there are some place to lost pressure??
Other question: looking at "bowersflybaby" in " Continental A&C-Series Aircraft Engines Parts Interchangeability Catalogue" i saw that there are two kinds of hydraulic lifters, "531694 unit - valve lifter hydraulic (replaces 21609)", and"533399 unit - valve lifter hydraulic ( 3 to 6 second bleed-down" with this detail (3 to 6 second bleed-down) in use with C90 with steel camshafts #531076, that is mine, if i use the firs unit "531694" instead of the "533399" unit, can cause this problem?? What means this 3 to 6 seconds to bleed-down??
Thanks for all!!
Hudson
I made a cranck case overhaul and adjustments to fit in my cranckshaft measures and oil pump adjustments too.
Today i just finished to assembly the engine and runned it, but was the same!!!!
Its looks like that anything was done on the engine... Idk what to do now...
When its stars, pressure goes to 65psi and 7minutes after is with 20...
My question: in cylinders, there are some place to lost pressure??
Other question: looking at "bowersflybaby" in " Continental A&C-Series Aircraft Engines Parts Interchangeability Catalogue" i saw that there are two kinds of hydraulic lifters, "531694 unit - valve lifter hydraulic (replaces 21609)", and"533399 unit - valve lifter hydraulic ( 3 to 6 second bleed-down" with this detail (3 to 6 second bleed-down) in use with C90 with steel camshafts #531076, that is mine, if i use the firs unit "531694" instead of the "533399" unit, can cause this problem?? What means this 3 to 6 seconds to bleed-down??
Thanks for all!!
Hudson
Attachments
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
That oil pump housing looks pitted and scored in the picture. If that's correct it could sure explain your problem.
Hi Gordon!
Yes, we imagined that so we changed the case but used other that oil pump gears was "bushed" due to clearance...
Can the oil pump do it again???
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
I would expect that the Continental table of limits would have detailed information about all of the clearances. I know the Lycoming overhaul manual has numerous oil pump dimensions specified, but I am not familiar with Continental details.
aktango58
FRIEND
18AA
When metal warms, it moves slightly.
Hairlines cracks will show when the engine warms up, could there be an internal crack somewhere that opens once warm? I have seen a couple case cracks that could only be found with dye penetrant or other NDT methods... except for a slight oil slick bleeding out of the crack in flight.
Hairlines cracks will show when the engine warms up, could there be an internal crack somewhere that opens once warm? I have seen a couple case cracks that could only be found with dye penetrant or other NDT methods... except for a slight oil slick bleeding out of the crack in flight.
1piece@atime
Registered User
Northern Vermont
Another thought if not already mentioned. On a 0-200 If using a b&c starter and didn’t replace the pressed needle bearing with the plug there will be a internal oil leak. A c90 might be different though
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1piece@atime
Registered User
Northern Vermont
Sorry, I just noticed you don’t have a starter
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Sent from my iPad using SuperCub.Org
Guys, today a new test with other oil gauge and a new oil pump, and was the same! All engine sizes are ok, oil pump remade with all tolerances ok, idk what is doing that!
I have doubt about the oil gallery near prop, because some people said that when use radiator need to do something and without radiator need to do another thing, so some guy here know what i need to check in the oils gallerys role in front of case???
Wrong hyd lifters can couse this problem??
I did read once that says a difference in seconds to deflate, someone knows about that???
Thanks!!!
I have doubt about the oil gallery near prop, because some people said that when use radiator need to do something and without radiator need to do another thing, so some guy here know what i need to check in the oils gallerys role in front of case???
Wrong hyd lifters can couse this problem??
I did read once that says a difference in seconds to deflate, someone knows about that???
Thanks!!!
Attachments
NWskiandfloat
Registered User
I too overhauled an 0-200 awhile ago that has been pickled. I decided to check the oil pressure with an electric pump. No pressure. I didn’t install the vacuum gear as well...found this thread and decided to drop the vacuum pump pad. No screws on the camshaft. I emailed Harry Fenton the small engine guru and he confirmed that the screw holes must be filled or oil pours out. So I spent the last two days contemplating, installing screws and safetying through the two inch hole. Once I got the procedure down it only took a couple of of hours. I used 10-32 filster head screw, 3/8” long. I used waxed lacing cord wrapped around the threads so when I pulled on the string with one finger holding the screw in place it would turn and start itself. Magnetc tool got it in place with enough room for my fat finger to holed it there. Once started I tied a flat tipped screw bit to a ratcheting wrench and turned it a little at a time. I safetied the screws two at a time I then tapped the oil hole for the vacuum pad (6-32) and inserted a flush screw.
Attachments
NWskiandfloat
Registered User
what is the differences in those 2 cams?
BC12D-4-85
SPONSOR
Fairbanks, AK.
-608 for vacuum pump on acc case?
well I am having a little oil pressure issue myself that is heat related, so I have tightened up my baffles and I ordered 2 different springs and took the one out of the engine. The top blue one is continental factory part, the middle blue one is fresno and the bottom is the one I took out of the -8 accessory case. New aluminum accessory case, new oil pump gears...pressure holds 40 until the temps get above 210, then it drops off quick. I will see how the continental works compared to the one I took out. The Fresno one was way less on the spring compressor...
Attachments
BC12D-4-85
SPONSOR
Fairbanks, AK.
What oil Tim?
Gary
Gary
each of those.
if i remember right, i think compressed to a 1 1/2 there suppose to be 6 lbs. what are
