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1948 Cub won't turn two full revolutions with crank

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Janicholson
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Joined: 30 Jan 2004
Posts: 37121
Location: St. Cloud, MN

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PostPosted: Thu Jun 17, 2021 5:12 pm    Post subject: Re: 1948 Cub won't turn two full revolutions with crank Reply to specific post Reply with quote

Make 4 thin aluminum wedges and use them around the seat and face to put up pressure on the valve. Actually grinding the valve head flat on 2 sides
would allow getting a grip on it. Valves are not worth your time, and easily purchased. You might need one anyway. if it is .015 off the seat. grind
it before hitting it down with a hammer. Be sure it on TDC compression for that cylinder so it has clearance. Removing the keeper and spring can't
happen till it can move. Jim
 
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Stoneridge62
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Joined: 07 Jun 2019
Posts: 5


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PostPosted: Sat Jun 19, 2021 1:10 pm    Post subject: Re: 1948 Cub won't turn two full revolutions with crank Reply to specific post Reply with quote

I have been spraying KRoil through the exhaust port right where the valve stem goes into the block casting for days. That is the top of the guide correct?

I got the valve open to the point I can slip a .035" feeler gauge between the head and the seat but it won't open any further. Getting to that point took a lot of persuasion.

Is it possible I may have a bent valve? Given it won't go up the stem would have be bent at the bottom of the guide correct? That does seem odd to me as I haven't been wailing away on anything up to this point.

If it is bent, how do you go about removing it? If it was an OHV engine I would just cut off the stem at the top of the guide, press the valve out and if necessary replace the guide. Searched this forum and didn't see anything related to removing a bent valve.

Is this thing toast?
 
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old
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Joined: 12 Mar 2000
Posts: 90219
Location: Lake of the Ozarks area of MO

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PostPosted: Sat Jun 19, 2021 2:31 pm    Post subject: Re: 1948 Cub won't turn two full revolutions with crank Reply to specific post Reply with quote

When I started working on the stuck valves on the Cub I have at first I could only get them to open a little bit. I kept working them up and down and kept pouring ATF on them. Once I got them to open enough to grab them with a pair of vise grips I did so and made them turn as much as I could. 2 o them where so bad I had to remove the keepers and they pry them up to the point I could grab them and then turn and pull till they came out. I was then able to clean them up and also use a drill bit to clean up the guides. I just spent 30 minute on it cutting some weeds with the belly mower
 
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