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Changing Cub main bearings


 
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thdrduck
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Joined: 18 Jun 2011
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PostPosted: Sat May 08, 2021 3:53 pm    Post subject: Changing Cub main bearings Reply to specific post Reply with quote

My little cub was ran without oil pressure. Don't know for how long. Doing a refresh on the engine, rod bearings are all galled but the crank journals and cylinders are good.

Can you change the main bearings without removing the crank? I haven't pulled a cap yet but suspect the mains may be galled also but I have no plans or inclination to pull the crank.
 
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MikeJM
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Location: New Jersey

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PostPosted: Sat May 08, 2021 4:46 pm    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

Are you certain you fixed the oil pressure problem?

The chances are good that you might be able to clean the bearing material off the crank and put new bearings in. Have to do one at a time to not hurt the seals. Doing it in frame is difficult, but Ive done it on an engine once before. Ive done others, but we pulled the crank.
 
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rustred
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PostPosted: Sat May 08, 2021 6:03 pm    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

first of all i dont believe the crank is good , if brgs. are toast then crank needs a turning. are you sure you know what the crank should
look like? and yes you can change the mains without removing crank. use a cotter pin in the oil gallery and roll them out. post some
pictures please of that crank and brgs.
 
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thdrduck
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PostPosted: Sun May 09, 2021 4:46 am    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

The oil pump had lost prime. I ran it for maybe 30 seconds but don't know how long it ran before I got it. Once I primed the oil pump it had good oil pressure. Valves and rings on 2 and 3 were "stuck" so it was really hard to get started and keep running so don't think it ran much. Crank journals are not perfect but not bad and within standard range and round. If I was doing a major I would of course have the crank turned but have no intention of returning this Cub to a life of hard labor.
 
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MARK ROBKE
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PostPosted: Sun May 09, 2021 9:56 am    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

You can 'roll' the mains in, but if they are galled, the crank is too.
I would also worry that the cam bearings are bad and possibly the cam
too. Mark.
 
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thdrduck
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PostPosted: Sun May 09, 2021 11:32 am    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

It's really amazing what a couple of minutes of "stupid" can do. If this was a car engine that needed to turn 3-4 thousand rpm I wouldn't be doing it this way. But a 12 hp 4 banger that turns maybe 1300 rpm, I think it will run longer then I will. Thanks for everyone's input.
 
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rustred
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PostPosted: Sun May 09, 2021 1:26 pm    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote

well i am a licenced mechanic and will not give stupid info. so if you figure its all good why ask . i know when things will work and not
work.
 
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thdrduck
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PostPosted: Mon May 10, 2021 4:23 am    Post subject: Re: Changing Cub main bearings Reply to specific post Reply with quote


Did not call anyone "stupid" or mean anyone was giving "stupid" information. The "stupid" reference was about running an engine without oil pressure.
I also have credentials.

Sorry you took it the wrong way Rustred.
 
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