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Update:Turbo oil carryover revisited[ALL/1988] posted by Bill Odom on
Tuesday, 27 January 1998, at 8:28 a.m.
...hit your back button and your input should be retained.
Hmmm. Keyword should. It didn't....teach me to be verbose.
I thought I'd post an update on this. My '81 turbo has the smoking/high oil consumption problem under high vacuum or coasting conditions.
Well, I installed new valve guide seals, which was deemed by many the most likely cause of the excess vacuum. The old seals looked like new and guess what, it didn't help a bit! I sure was hoping 'cause this is not a fun job; I did take the opportunity to install new front seals and a new timing belt.
I tried a couple of other mods, also to no avail. I vented the oil filler cap (I know, this is not kosher) by installing a miniature K&N type filter inside it and drilling a couple of holes through the floor of the cap. An invisible (and problematic) mod. Didn't help. I also tried a pcv valve in the vent line from the crankcase breather over to the turbo inlet. This allowed the turbo to pull vapors out of the crankcase but didn't allow the vacuum condition to pull back which unbalances the pressures in the turbo which causes the oil carryover. It also didn't allow venting except through the oil cap. This did seem to reduce the smoking, but the oil cap now blows oil all over the exhaust manifold! Good way to do a flame job. Me thinks the motor is just tired and in need of new rings. Sure does run good though.
Re: Update:Turbo oil carryover revisited[ALL/1988] posted by Art Ward, Art Works Volvo Tacoma WA on
Thursday, 29 January 1998, at 2:39 p.m.
Dear Bill
It sounds like your crank case breater/oil seperator (under intake manifold and over starter is clogged. This is where the flame trap hose attaches to block area. To test take a length of hose about 3/4 idand 2 ft long, remove the flame trap from oil seperator and slide your test hose in it's place. Blow on the hose. Air should pass easy. If not remove and replace oil seperator. I see them all the time clogged. Many miss diagnoses have been made here. Guys replace turbos and valve seals etc.
Give it a try.
Good luck
Art Art Art
Re: Update:Turbo oil carryover revisited[ALL/1988] posted by Bill Odom on
Thursday, 29 January 1998, at 3:12 p.m.
Been there, done that too. Thanks anyway..
This all started (restarted) some time ago and I was convinced that it was the turbo's fault. Well, the turbo finally contacted on the turbine side and a rebuild was mandatory. When the problem persisted with the rebuilt unit, I pulled the oil separator off (again) and checked it out. Some fouling but nowhere near plugged. The turbo units apparently don't have the flame trap like the non-turbo cars; it does have an orifice in the plastic Y that the breather line goes on. It too was fouled a little but not stopped up. Have you ever had any problems the oil separator oil return line (plastic pipe that goes under the separator, in the front hole, and takes oil back to the sump)? Mine was cracked/split and I tried to pull it out. Could only get some pieces from it; the bulk of it is still in there.
Bill