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HM100 159287P - seeking torque of bolts closing crankcase

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Juhan
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2023/11/01 11:59:53 (permalink)
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HM100 159287P - seeking torque of bolts closing crankcase

I am reassembling the engine.  Ordered parts and using Technician Manual.  Charts not clearly identifying case cover nor naming bolts with torque spec.
 
Sent message to "contact" and directed to join Forum.
 
Have diagram if more clarification needed.
 
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Thanks
 
 
post edited by Juhan - 2023/11/03 13:27:20

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    Conrad Sigona
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/03 11:29:32 (permalink)
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    What you're looking for is what Tecumseh calls a cylinder cover. Look at the table which you attached under "Mounting flange or cylinder cover.
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    Juhan
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/03 13:38:30 (permalink)
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    My problem is that comparing the two bolts, in pictures I now attached ... the larger confines the compressed explosions under the cylinder tightened to 180-210 inch lbs while the smaller squeezing a gasket confining oil in a crankcase tightened to 110-140 inch lbs ... both according to a piece of paper not referencing clear descriptions.  The torques are so close in value I question the validity while viewing their comparative size and application.
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    Conrad Sigona
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/03 16:55:35 (permalink)
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    Both are quite light as torques go, but bear in mind that we're working with small engines, not trucks. If I would be surprised by either, it would be the torque for cylinder head bolts, not for the cylinder cover bolts. Your original question, and title, asks for the "torque for the bolts closing the crankcase". I answered you that it's 115 in. lbs, within the range on your attached sheet, a number which indeed makes sense.
     
    You don't like it? What would you prefer that it be?
    post edited by Conrad Sigona - 2023/11/03 20:10:08
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    Juhan
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/04 12:16:35 (permalink)
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    All I want is to be sure is that I do not have to ultimately start drilling and using my EZouts to back out another snapped bolt holding an oil-filled crankcase.
     
    I am grateful for your input.
     
    Juhan
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    Conrad Sigona
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/04 14:15:31 (permalink)
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    I suspect that the danger of overtightening would be to strip out the aluminum, not to snap the bolt. In any case, there's not much danger of snapping a bolt by torquing it to 125 in. lbs. Note please that it's inches, not feet. That's only 14 Nm.
     
    Good luck.
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    Juhan
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    Re: HM100 159287P - seeking torque of bolts closing crankcase 2023/11/04 14:57:12 (permalink)
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    Thanks
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