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Old 07-04-2022, 11:13 PM
Dave0131 Dave0131 is offline
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Location: Alberta
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Default K321AQS burning oil

Hey I’ve got a 1979 1450 hydro. I had a couple oil leaks I fixed over the winter, had the engine out to do it but now I’ve cut the grass I seem to be burning oil. Seems like it burns 1/2- 3/4 liter(quart) per 2-3hours of cutting. It doesn’t smoke or anything which I think is odd. I thought I’d be able to see it in the exhaust but I can’t. What would be my next go to? Re doing the top end? And if so is it fairly straight forward? I have a decent knowledge which 2 strokes have done a handful of top end 2 strokes but nothing 4 stroke. Is it similar? Are valves easy enough to figure out?
Thanks for the help
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Old 07-05-2022, 06:16 AM
R Bedell R Bedell is offline
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Oil consumption is in usually in these areas. (A) The Piston Rings, and/or (B) the Valve Guides.

It is a straight forward process, and as you would expect, it is engine tear down.

There is a Kohler Engine Service Manual (K Series) in the Technical Library Section, for download to aid in your repairs.


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Old 07-05-2022, 08:53 AM
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olds45512 olds45512 is offline
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That's alot of oil for there not to be smoke. I'd suggest looking it over real good to make sure there isn't a leak.
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Old 07-05-2022, 09:56 AM
finsruskw finsruskw is offline
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Pan gasket and or cracked pan
front and rear main seals
valve breather gasket(s) there are 2 of 'em
Governor shaft bushing (the brass one behind the adjusting lever)
Head gasket
points push rod

All area to keep an eye on.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

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