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Step by Step! Today we'll be doing a valve job on a Tecumseh HMSK80 engine, that's on a John Deere TRS26 snow blower. This snow blower would not start when it was delivered to me. With the piston passed TDC on the compression stroke (both valves closed) and using my OTC Leak Down Tester, I was able to see that there was an exhaust valve leak, as air was escaping through the muffler. Once we tear down the engine, it is clear that someone else may have worked on it previously, as shown by the exhaust valve seat looking freshly cut. After grinding and filing the valve stem tip gave us the proper Valve-Tappet clearance, we lapped the exhaust valve in, and sealed it up. With the exhaust valve now sealed up, we then realize that the intake valve is also leaking, but wasn't noticeable, as the exhaust valve leak was worse. Unfortunately, this is where we run into some complications. As much as I tried to lap the intake valve, it just wouldn't seal up. I called my customer, and we decided to refinish both valves, by cutting a new 45* valve face. I repeated the same tolerance check steps on the exhaust valve, setting the exhaust valve clearance to 0.010" cold (which should be 0.008" hot), lapped it in, and sealed it up once again. I then focused my attention to the intake valve, only to discover it had a small warp (caused by heat) and wasn't "true." I was able to source a used Tecumseh HMSK 80 intake valve, that was pulled from an engine that ran, and was able to file the Valve-Tappet tolerance to 0.008" lap it in, and finally seal it up! With the Intake Valve set to 0.008" and the Exhaust Valve set to 0.010" I installed a new STENS 425-450 head gasket, reassembled the engine, and brought it outside to test it out. The engine fired up on the 1st pull, and ran smoothly. I made a slight adjustment to the carb, and returned it to a very happy customer! _______________________________________________ If you enjoyed the video, hit LIKE & SUBSCRIBE! New videos every week! SOCIAL MEDIA: Instagram: ELMN80R / eliminatorperformance / elmn80r / eliminatorperformance DONATE: paypal.me/ELMN80R Bitcoin: 1NYgPvcvBWuhGRewsLE4Scy1cbzwndh5hZ 2ND CHANNEL: EP Vlogs: / @eliminatorperformancevlogs7690 GEAR: Camera: https://amzn.to/2HVkW9o Tripod: https://amzn.to/2HGWt4w Microphone: https://amzn.to/2J7k9DA Cheap Mic: https://amzn.to/2xCBn6z Headphones: https://amzn.to/2JeHUG9 Editing Software: https://amzn.to/2JD7OTx Photoshop: https://amzn.to/2HBY6Ez MUSIC: Intro/Outro Music: Burnt - Jingle Punks