The previous owner of my Sprite decided that a PCV valve was a "bad thing" and removed it as well as the hose leading from the oil separator mounted on the timing cover. (The 948cc engine has a draft tube that creates a vaccum in the crankcase when the car passes through the air, but only vents the crankcase when the car is sitting still.) Maintaining such a vacuum certainly helps prevent oil from flowing through the tight tolerances of the rear main cap/cover. Air is drawn into the engine, by the PCV system, through a calibrated orifice in the oil filler cap. The 10cc engines have a PCV system that is supposed to maintain a vacuum on the crankcase. There are kits available for installing a true rear main seal, - they are an option. If the block is line-bored, or if the cap/cover is allowed to scrape on the crank, this critical fit could easily be destroyed. The fit of the cap and cover in relationship to the crankshaft is critical for oil control. There are spiral grooves machined into the "sealing surface" to pull any escaping oil back into the crankcase. Instead, the rear-main cap / rear cap cover are machined to tight tolerances with the "sealing surface" (for lack of a better word) of the crankshaft. Sprite engines are similar in basic design to American-made motors, except that they have no rear main oil seal. If I state something that is obviously stupid, let me know so I can learn. I am not inferring that I am a Sprite expert in any way, but offer my opinions for your consideration. I am happy to say that after the first 400 miles, my engine has not leaked one drop of anything onto the white cardboard I have placed under the car when it is parked in my garage. Recently, I performed a complete overhaul on the 1275cc in the 67 Sprite I acquired 6 months ago and applied my sealing techniques during the re-build. Over the years, I developed many opinions as to how to successfully seal them against leaks. Feb 14 Making A Start On Removing Tim.Īlthough I am a Sprite novice, I have built more engines than I can recall during my tenure as a professional mechanic for American automobiles in what seems like a previous life.May 15 Repairs So Far Since Sept 2022.Sep 30 MDMGs On The Rocks British Car.Sep 23 NCBCCWNC Autumn In The Mountains.Sep 16 DEBCCD Annual Fall Car & Motorc.Sep 10 NYJaguar Invitational Concours.Sep 03 NYAutumn Sports Classic Super C.Aug 27 NYMGCC Sports Car & Auto Festival.
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