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Re: ticking from top of engine Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Tue, 15 Sep 2015 22:26:35 In Reply to: ticking from top of engine, rob 96 aero, Mon, 14 Sep 2015 15:52:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The valve is called the Oil Check Valve, Saab part 9167784. Also called a pressure relief valve. It is aluminum and moves inside the steel timing chain cover. Bits of wear metal can get squeezed between the check valve and the timing chair cover resulting in scratches on the check valve. In the worst case the valve can get stuck in the position where it allows oil to bypass the engine by returning to the sump. The damage is already done by the time the oil can idiot light turns on. Ticking is not a clear indicator that the engine isn't getting enough lubrication.
I replaced mine at 217K miles for peace of mind, and I replaced the associated spring with a stiffer spring made for the next generation B235 engine. The stiffer spring is Saab part number 55557232. This stiffer spring makes no difference until rpms exceed 4,000. At 5,000 rpm the stiffer spring produces an additional 10 psi of oil pressure.
I run 5w40 synthetic year round in NC where it doesn't get very cold. I'd like to say that my engine is getting plenty of oil flow (it is the flow of oil, not the pressure, that lubricates), but without an oil gauge I really don't know.
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