bigcountry1009
New member
I'm gonna have to replace the head gasket on my Farm Pro 2420 with the Jinma TY290 motor. I can't find any bolt torques for when I put the motor back together. Can any body help me out? Thanks ahead of time.
Head bolt torque numbers differ significantly between my 4 cyl YangDong (TS354C) and my 3 cylinder FeiDong (KM454). As such, I would find it surprising if the YT290 and Y385 shared a common spec. I know 95-105 is wrong for the Y385, an error that would ordinarily justify independent verfication for the TY290. But since Ron had previously posted 95-105, I think that's probably the correct set of numbers.Harrygoodwrench said:Here is a link to Johns Jinma that I believe will help. JMretorque
greg_g said:Head bolt torque numbers differ significantly between my 4 cyl YangDong (TS354C) and my 3 cylinder FeiDong (KM454). As such, I would find it surprising if the YT290 and Y385 shared a common spec. I know 95-105 is wrong for the Y385, an error that would ordinarily justify independent verfication for the TY290. But since Ron had previously posted 95-105, I think that's probably the correct set of numbers.
Note paragraph (5) though. I personally do not agree with the " do no loosen first " advice.
//greg//
greg_g said:Two reasons Dave;
1. First one's common sense. A good mechanic doesn't assume the last guy knew what he's doing. He checks for over-torque as well as under-torque. Let's say you've set your torque wrench to click at 105 ft-lbs. You don't loosen the head bolt, you just assume the bolt's ok when the wrench clicks. So what if that bolt's actually torqued to something above 105#. You'll never know.
2. Second one's science. When headbolts are tightened, the force of applied torque on elastic threads serves to "clamp" the male and female parts. Without a secondary locking device (Nylok nut, lock washer, etc) this "clamping" is all that holds properly torqued fittings together. Over time, engine heating/cooling cycles, moisture, vibration, can render the clamping force to become greater than the torque spec. To verify/reset torque, you must first overcome the clamping force. That means backing off on the existing force that hold the bolt in place, then resetting it to the specified torque spec
Loosen, retighten, set.
//greg//