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north east IN | Have put several head gaskets on my 8650. It doesn’t get used much mostly packing silage and hauling some manure. It has set outside since last December went out to start it last week and the head gasket blew out again. It is always the back cylinder. Checked things to make sure everything is flat and Putin new bolts and torque them to specs. Any thoughts on this. Thanks
Edited by 260david437 8/3/2022 19:59
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Michigan | Don’t know a lot about these engine but I do know there are many different length head bolts used. Some of which are very close in length. You might not be getting the correct clamping force if the bolt is just slightly too long. |
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north east IN | I have been getting the bolts from Deere but I will have them check to make sure I am getting the right bolt |
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| You need the spec for the minimum head thickness. If it has been surfaced very many times it is scrap metal. I fought mine for years until we figured this out on mine. There could be other causes, like the block not being flat or cracked. Do you know history on the tractor or if the head has been planed in the past? Are you using new head bolts and making sure the head bolt holes are clean? |
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Mount Vernon, WA | Sounds like your liner(s) are sunk. Check liner protrusion carefully next time the head is off. The liners need to be clamped down with washers and bolts for this check. |
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Marion,ks | A poster from Iowa put fire rings in the head gasket , claimed to fix the problem . Both of 8650s have had a new gasket ,heads planed and no problems .I know we where real careful to have everthinmg spotless and we retorque our bolts the next day to the max. |
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Ludington/Manistee MI area | Brand of head gasket? |
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| Drink plenty of milk to help with the ulcers.............. |
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| Bottoming tap on the holes is especially necessary the closer the head gets to minimum IMO......................Unfortunately the frame(Or lack of it in this case) is the big issue, especially like in this case using it with a blade pushing. While the 619 seems to be fine elsewhere in the Deere's products, them seem to be nothing but trouble in the 4x4 tractors, not enough iron in them to be a piece of the frame, I often wonder what Deere was thinking there. |
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Boone, Iowa | I worked a local repair shop and we did quite a few 619 engines with head gasket issues. Yes, the counter bores crack and the liners sink, because the design of the engine mounting solid to the front frame and axle. You need to get the head machined for fire rings and a head gasket made for the fire rings. The shop has a local machine shop that can cut the grooves and he has the fire ring/head gasket set. Let me know if you want contact info. |
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S.E. Washington | 260david437 - 8/3/2022 20:06
I have been getting the bolts from Deere but I will have them check to make sure I am getting the right bolt
There are several revisions of bolts. Make sure you get the latest specification for the exact bolts you are getting.
Von and a couple others have posted the torque spec charts. Come back with a picture of your bolts and we can help check and make sure the spec you are using matches the bolts you are getting. |
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| Don't use those polishing discs to clean the head and block surfaces. They metal needs to be somewhat rough so the gasket doesn't move between the two. |
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Michigan | Biggest POS we ever had on the farm, thanks for the upcoming nightmares. |
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SW MN | Several good Suggestions, my addition would be the head and block both need the machined rough surface for a head gasket to grip and clamp correctly. Polished is NOT GOOD! |
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| 260david437 - 8/3/2022 19:58
Have put several head gaskets on my 8650. It doesn’t get used much mostly packing silage and hauling some manure. It has set outside since last December went out to start it last week and the head gasket blew out again. It is always the back cylinder. Checked things to make sure everything is flat and Putin new bolts and torque them to specs. Any thoughts on this. Thanks
You're not alone. From my understanding, the problem is that the engine was used as a structural member on the 40/50 series 4WD's, so any torsional stress is absorbed by the engine, which ultimately causes head gasket failure. Broken crankshafts are another common failure with the 619.
Edited by Bigshot 8/4/2022 23:54
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West Union IA | Don’t know why they called them boat anchors until you owned one. |
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Northeast Iowa | take the blade off the front of tractor.. with the uneven surface of silage pile you are pivoting the front axle to the stops and then puts pressure on the side frames and twisting the block |
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Can’t keep the head gasket on a jd 8650
