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Author  [Modern View]

12-02-2018 21:21:22

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Ariens 914-012 (60" out front) Hydro 3425 hrs. This must be a miracle or it was rebuilt before I got it in 1998. The #1 head is on Cyl. 2 so at least top end likely. It ran perfectly until I hit a root which pushed the deck leading edge into the #3 blade which stopped it instantly. I knew what happened and dropped the blade clutch before the engine had reached 1/2 speed. The #3 blade is driven by a belt from the center (main) spindle. The main spindle is belted from a reduction idler (~ 10%) thence to the electric clutch. The engine ran perfectly back to the shop. I stopped the engine to check for damage. On restarting there was no compression. I removed the 1/2" pipe plug at the front which allowed visibility of the cam and governor gears. The cam was missing 5 consecutive teeth. I replaced the cam with a used one (actually looked new). I don't expect to ever know how such a gentle jerk could cause the gear strip. The rest of the engine looks like new; no ring leakage,no valve leakage. My question is the case sealant. The FSM lists a bunch of silicone sealants for the case halves and pan. The case assembly is very similar to a Volkswagen 40 HP air cooled. As a certified VW mechanic I rebuilt nearly 50 engines. I always used Permatex 300 aircraft sealant on the case halves and never had a sign of a leak. Is there any reason or experience why not to use the same on a Mag 20?

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12-03-2018 11:32:57

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 Re: KOHLER MAGNUM 20 in reply to RaymondK, 12-02-2018 21:21:22  
No reason at all being an old A&P I've used locktite gasket maker and now yamabond all work good

GB in MN

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12-03-2018 12:18:13

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 Re: KOHLER MAGNUM 20 in reply to MNGB, 12-03-2018 11:32:57  
Thanks GB

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