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| | | Joined: Mar 2005 Posts: 6 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 6 | have a 35 1 1\2 ton flatbed with 207 six runs good , good oil pressure. over heats about every 3 miles. the radiators clean. the block has no rust and the waterpump appears to be working . can anybody give me some advice on this. thanks in advance. | | | | | Joined: Feb 2000 Posts: 769 Shop Shark | | Shop Shark Joined: Feb 2000 Posts: 769 | Do you mean that you drive 3 miles; it heats up, then cools down; you drive 3 miles, then cools down; etc. etc? Or, do you drive 3 miles, it heats up and will not cool down? | | | | | Joined: Apr 2008 Posts: 203 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 203 | Definitely sounds like you have a block in one of the cooling passages. Or maybe it's not really hot, and your temp gauge is out.
Time to rebuild...
Dave
| | | | | Joined: Mar 2005 Posts: 684 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 684 | Is the thermostat good? If the radiator is original I would have it recored. Also take the water pump off and inspect the impeller. And flush the block at the same time. | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Check the timing and valve lash too, both of those can cause overheating when they are wrong.
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