Found the source of my oil leak
in [Toyota]
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From: Ray O on 28 Oct 2009 16:03 "Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:hc7vmu$7ee$1(a)news.eternal-september.org... > <snipped> > Really? Don't get it done? > > > > <JS> > Not if you're only going to get a half quart of oil per Change Interval > back. > > The oil at the front and rear main seals is pressurized at whatever the > oil pump pressurizes to -- typically about 30psi at freeway speeds. If > these seals need attention, you will have more than a missing half quart > per change interval. > > The general rule of thumb is 10psi for each 1000 rpm. So, at freeway > crusing speed, what does that give you, 30psi? Whatever the spec is, the > oil is pressurized at the main bearings and seals, so if there was a leak, > it would be pretty active. > > That's my story, and I'm sticking to it. > > </JS> > Any oil that comes in contact with the inside of the crankshaft seals is not pressurized by the oil pump in a wet sump setup. The crankshaft sits above the oil pan, which is not pressurized by the oil pump. The oil that contacts the inside of the seals are what gets splashed there by the crankshaft or, if the PCV system is not working correctly, the crankcase can become build up positive pressure instead of a vacuum and cause leaks from the crankshaft seals and oil pan gasket. -- Ray O (correct punctuation to reply)
From: Ray O on 29 Oct 2009 12:39
"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message news:hcce8e$6ii$1(a)news.eternal-september.org... > <snipped> >>>> > Good to know I'll be able to make it to 180k and get the oil seal >>>>> > done with my routine timing belt work. >>>>> >>>>> If you can tighten the filter properly and get back to the half quart >>>>> between oil changes, I'd recomment you ignore the main seal(s). Let >>>>> well >>>>> enough alone. >>>> >>>> Really? Don't get it done? >>>> >>>> ******** >>>> I think that it is worth changing the front crankshaft and camshaft >>>> seals every 3rd timing belt replacement since they will be exposed when >>>> the timing belt is replaced, and getting to the seals is the bulk of >>>> the labor. To change the seals, the front crankshaft pulley, timing >>>> belt cover, and timing belt have to come off, which is also the case >>>> when replacing the timing belt. IMO, an extra half hour or so to >>>> replace the seals is good preventative maintenance. >>>> -- >>> >>> >>> >>> I'd agree with that. If one is replacing the timing belt, it's a good >>> idea to do the seals. >>> >>> But I see no reason to go after the seals in an attempt to recover a >>> half quart of oil per change interval. >>> >> >> The OP had mentioned that he was going to have the seals changed when he >> had the next timing belt replacement. His response in reply to your post >> seemed to me like he thought that you recommended not changing the seals >> no matter what. >> > > I musta missed something. I read that he was gonna do the seals for no > other reason than he was concerned that a half quart per change interval > was a symptom of a problem. > > Yup, If you look above, I snipped all the other stuff down to where the OP said that he was going to replace the seals with the t-belt. -- Ray O (correct punctuation to reply) |