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Original Message
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| RE: hot cylinders |
| By John - 11/06/2005 1:17:33 PM; IP 142.177.81.103 |
| How very odd. You say you checked the valve lash and it was OK? Sometimes, that's not easy with Hyd lifters. I suspect a head gasket cannot be installed wrong way around, but I'm not sure. Rear cylinders will run hot due to water circulation not being great towards the rear of the engine. But an air-lock can make it worse. Suggest you loosen heater hose on manifold and top up rad until water comes out of heater hose spigot. Also, check plugs. Purplish dots on plugs indicate over heating, possibly due to too lean a mixture. Could be the whole engine is running lean (or spark too far advanced), but only the rear cylinders show the heat due to the water not circulating as well back there. Will the engine idle normally? If you can't get a low idle, you may have a vacumn leak. If your PCV valve is on the passenger side vs the carb spacer, it may be leaning out the passenger side cylinders if it's not working properly. Once again, cylinders 1 and 2 may also be affected, but better water circulation keeps them from getting as hot as 3 and 4. My best guess is an air-lock. As above, purge the water system and make sure no air is in the cylinder head. try the engine again with the heater turned on and the rad cap lossened (or off) to make sure all air gets out of heads. |
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