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1. 05:58 AM - Re: Low Oil Pressure Indication on Cockpit Gauge (dashwood)
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
i too have been chasing oil pressure issues in my 912. sourced a few problems with
leaking oil lines and seals in gearbox...see posts over the last year by me
about this and the gearbox failure. i replaced the vdo sender 3 times. the
pressure readings after 10 to 50 hours would start fluctuating or fall off too
low... i replaced the elec oil stuff with a steam gage style. very very small
copper tube (1/16"). with a 2.5" loop at the engine outlet, another loop at
the firewall and a "s" curve behind the gage. i did not change the relief valve
to the new style. i did not bleed oil through the tube to the gage when i installed
but the readings were rock solid from the time of first start with this
system.. i would get a steady increase in pressure to about 70lbs on a cold
start.. and very little fluctuation at any rpm settings. my ame said i should
have put a slight crimp in the line close to the engine in case of a line break.
to slow the oil loss. i did that in 2 seconds with a pair of pliers.
after about 8months of bliss running amsoil full synthetic 20/40 and 20/50
i changed oil type. used to have..... oil pres of 65lbs in all settings. slow
pres rise when cold. rpm at climb out or 5280 and max 5300 in level cruise. egt
of 1500 to 1570. oil temps around 220F
after changing to shell +4 semi syn the pressure rises quickly to 38lbs and stays
there at idle and taxi rpm. as rpm increases to full throttle the pressure
increased to 65lbs and stays there solid.climb out is 5300 and level cruise starts
at 5400 and quickly goes over 5520( the setting for my max over rev alarm)
I now have to throttle back to maintain 5400. egt is constant at 1400 and oil
temps stay close to 200F. fuel burn / hour has decreased slightly, and oil
consumption / hours has increased slightly. ie no oil consumption at all till
approaching time for a change (50hrs)now is 1/8 cup every 6 to 8 hours. i have
about 25 hrs on the newer oil in varied weather conditions.
i feel the engine is performing better with less strain with this (shell airo +4)
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Ross Aalexander: CH701 driver 912ul 490tt
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http://forums.matronics.com/viewtopic.php?p=343748#343748
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