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Case Tractors Discussion Forum
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Cracked Heads or Bad Sleeves

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KevinT

03-19-2008 10:02:11




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I have a 68 680B (A267D) Backhoe which will not start without ether. Once going the #4 cyclinder takes 3 to 4 minutes to warmup and when I pull the radiator cap I can see bubbling and white smoke (exhaust). The antifreeze looks black with cabon not oil. I have no antifreeze in the oil. Thought it was a bad head gasket but now am thining it might be a cracked head around the exhaust port?? I will pull the heads this weekend but just looking for some expert advice as to what the cause might be and where these heads/sleeves have a habit of cracking.

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Joe (Wa)

03-19-2008 12:48:02




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 Re: Cracked Heads or Bad Sleeves in reply to KevinT, 03-19-2008 10:02:11  
Check around the valve seats, heads sometimes get cracked when the seats are pressed in and it doesn't show up until the warmup thermal growth.

I bought a gas 310 recently that had the same radiator symtoms. No antifreeze detectable in the oil. Previous owner had taken the head to a auto machine shop for testing, found nothing.

The #1 exh valve had a minute divot broke out in the casting near the top/under the valve seat. This is how I found it:

Backed off the lash until all the valves were closed, pulled the manifold and dumped some ATF in on top of each exh valve. Over night the ATF seeped down on one valve. Pulled the head and it was obviously seeping from under the seat as opposed to through the valve.

Joe

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