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Stuck valves or scored cylinder


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#1 New.Canadian.DB.Owner OFFLINE  

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Posted January 16, 2017 - 04:37 PM

Those are my choices.  I need to replace my tiller engine (5 hp, dual output shaft).  I can choose between a 4 hp tiller engine with a badly scored cylinder wall & a broken head bolt, and a 5 hp single output engine with gear reduction box with a stuck valve & two stuck lifters.  I would need to swap the crank & cam shaft if I go with the 5 hp.  Which way would you go?



#2 ducky OFFLINE  

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Posted January 16, 2017 - 04:59 PM

What is wrong with the original engine?  Is it possible to rebuild it?


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#3 New.Canadian.DB.Owner OFFLINE  

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Posted January 16, 2017 - 07:14 PM

The existing engine was making an evil noise the last time I had it out.  Sounds like it is either rod knock or lifters smashing into bent valves.  I would tear it apart but it is still on the tiller behind a door that is frozen to the ground.  Got to love freezing rain.  These two were in my other shed.  


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#4 stiemmy ONLINE  

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Posted January 16, 2017 - 07:34 PM

Cl for a different 5hp, a freebie, or a dirt cheap garage sale special is what I'd be in pursuit of!;)
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#5 framesteer OFFLINE  

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Posted January 16, 2017 - 10:28 PM

I'd try the 5 hp first as you have a better chance of fixing the valves compared to scored cylinder.


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#6 ol' stonebreaker OFFLINE  

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Posted January 17, 2017 - 10:52 AM

  I've heard of some finding a good used block, piston, rod, and crank that the sump cover will interchange on and using it and the cam to bring it back to life. I think it was lack of foresight that came up with this design in order to have a reverse gear in that the tiller would outlast the engine and in the future no one would build replacements.

                                                                Mike


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#7 Bruce Dorsi ONLINE  

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Posted January 17, 2017 - 04:39 PM

Are these B&S, or Tecumseh engines?

 

There's really no practical fix for a badly scored cylinder bore.


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#8 New.Canadian.DB.Owner OFFLINE  

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Posted January 17, 2017 - 09:17 PM

B&S.  The 5 hp is a 130252 0049 01.  The 4 hp is a 100292 0507 01.  I am wondering if I can oversize the 4hp bore to fit the 5 hp piston.  It is a full .065 larger.  Downside to that solution is the 5 hp piston has a stuck top ring.  It feels pinched, as if the outer rim has been hit.  It isn't stuck by carbon build up, & it is only in one spot.






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