YSB!2 head bolt torque settings

[Big Joe]

YSB12 cylinder head torque spec. I just got my Yanmar YSB12 cylinder head back after a valve job. During this process my Service manual and my original Yanmar YSB12 operation guide were thrown out with the trash by a "helper".I have a new Shop manual on the way. Can anyone confirm the YSB12 head torque so I can button this thing up. The problem I have heard 28lbs , 40 lbs all the way to 90lbs. This is quite a range. Can anyone confirm the factory torque specs for the head bolt on this one lung Yanmar.Thanks in advance for any helpRegards, Big Joe

 

[Bill G]

head bolt torque settings

Big Joe My service manual for the sve 12 shows 13.65 Kg/m. I get 9.2 ft lbs.You do the math I may be wrong, 9.,2 sounds too low and is a lot less than the values you have been given.After repair on my sve 8 the mechanic came back after a few weeks and tightened the head bolts again.HTHBill

 

[Big Joe]

Thanks

Thanks for that Bill. A kilogram should equal 2.2 lbs. So 13.65 Kg should be 30.03 lbs. Doesn't sound like much huh? I found out the YSE12 is 12.4 Kg, or 27.28 lbs. Who'da thunk it?Thanks for your kindness.Regards, Big Joe

 

[Big Joe]

For YSM12 owners

This is a link to a nice .pdf of thre service / owner manual for the YSM12.It shows the head torque as 13.6 Kg.Regards.

 

[TT23844]

Cyl. head torque-Yanmar YSM

Kg/m -> Ft.lbs - multiply by 7.233Kg/cm -> Ft. lbs - multiply by .07233The spec. in my YSM manual calls for 1,360 Kg/cm or 98 ft. lbs for the 12 HPSince the YSM & YSB are virtually the same engine, you're probably OK with the 98 ft./lbs figure.

 

[Big Joe]

Thanks TT

Thanks for starightening me out on that TT.Best regards, Big Joe

 

[Rick Webb]

My Torque Wrench is marked for Both

13.6 looks to be 98 ft/lbs

 

[Big Joe]

Thanks to all

Thanks guys I really appreciate the help. I see now my torque wrench has the same markings Rick mentions. Thanks Rick for the confirmation and to TT for the formula. And Bill it seems you were off by just a decimal point. Thanks again guys.Regards, big joe

 

[Rick Webb]

Thank You

I could not find my torque wrench and realized it was at a buddies house from when we worked on his boat. I'd have never found it in another couple of months after I forgot where I last used it.