Power in highway gear

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Power in highway gear

Postby ScottyG » Sat Sep 11, 2004 7:59 am

My Cub has a slight power loss issue that occurs in 3rd gear when I'm going slighly up hill? I don't recall this happening when I drove it home the first time.

When I refurbed the machine, my compression checked out ok in each cylinder weighing in at about 110 psi if I remember correctly. However, I'm wondering if when the Cub is brought to operating temperature, whether those numbers could reduce slightly if I need a ring job? I also notice this slight loss in power in second on steep inclines of >20 degrees or so but it's not as draining as compared to 3rd.

I adjusted my carb, valve tappets, governor (there is no surging) and now I'm wondering if I'm seeing a potential engine overhaul in my future. Maybe some carbon around the valve seats? Anything I should be checking at this point to what I haven't already mentioned? Perhaps this is normal given the weight of the tractor and the size of the engine?
"Henry" 1948 Farmall Cub

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Postby FarmallCubNJ » Sat Sep 11, 2004 9:12 am

What do you mean you experience a slight power loss? If you mean the tractor slows down some when you go up a steep incline remember you have a governor which adjusts the throttle to changing power loads. Sometimes the throttle can't keep the same road speed even fully open.

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Postby John *.?-!.* cub owner » Sat Sep 11, 2004 9:31 am

Scotty, you might want to check for play in the throttle shaft where it enters the fitting at the governor. See if the rod going to the carb moves easily. There should be opposition if you try to move it with the engine stopped.

Compression checks are normally performed with the engine at operating temperature and with all spark plugs removed. If your compression is low you will normally also see oil smoke at the filler, as well as blue smoke at the exhaust when it's running.
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