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GM 2.8L V6 Engine Problem



 
 
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  #1  
Old February 10th 15, 07:33 AM posted to rec.autos.tech
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Default GM 2.8L V6 Engine Problem

Hey Larry. Actually what a cooler thermostat means is that it opens to allow coolant flow through your engine at a lower temperature than the standard 190 degrees thermostat. That being so the coolant would be cycling through your engine at a safer temperature. The coolant would be colder than the engine is before the thermostat opens so if your engine is at 140 degrees when colder temperature coolant begins cycling through the engine id rather the engine be colder than 190 degrees. Its the whole idea of not using hot water to melt an icy window because the window will crack. Same thing just backwards.

Now exhaust doesnt move through the block except inside the cylinders before expelled through your exhaust valves. The exhaust then moves through separate passageways through your heads and intake manifold. If you have exhaust getting into your cooling system then you have an internal crack on the head between an exhaust port and coolant port.

Your head gaskets blowing is a result of a few different possibilities. Least to worry about would be old gasket going bad but it could also be from the head bolts not being torqued back down to OEM specifications which should be 40 foot pounds + a quarter turn on all 16 bolts. Over torquing can result in stretched bolts and warped heads and under-torquing can result in excessive head gasket failure and/or warped heads.
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  #2  
Old February 10th 15, 10:24 PM posted to rec.autos.tech
Steve W.[_6_]
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Posts: 1,161
Default GM 2.8L V6 Engine Problem

wrote:

> Hey Larry. Actually what a cooler thermostat means is that it opens
> to allow coolant flow through your engine at a lower temperature than
> the standard 190 degrees thermostat. That being so the coolant would
> be cycling through your engine at a safer temperature. The coolant
> would be colder than the engine is before the thermostat opens so if
> your engine is at 140 degrees when colder temperature coolant begins
> cycling through the engine id rather the engine be colder than 190
> degrees. Its the whole idea of not using hot water to melt an icy
> window because the window will crack. Same thing just backwards.
>
> Now exhaust doesnt move through the block except inside the cylinders
> before expelled through your exhaust valves. The exhaust then moves
> through separate passageways through your heads and intake manifold.
> If you have exhaust getting into your cooling system then you have an
> internal crack on the head between an exhaust port and coolant port.
>
> Your head gaskets blowing is a result of a few different
> possibilities. Least to worry about would be old gasket going bad but
> it could also be from the head bolts not being torqued back down to
> OEM specifications which should be 40 foot pounds + a quarter turn on
> all 16 bolts. Over torquing can result in stretched bolts and warped
> heads and under-torquing can result in excessive head gasket failure
> and/or warped heads.


And sticking a lower temp thermostat in any OBD 2 vehicle will set a
code and cause lower MPG. The engine uses the coolant temp to determine
fuel flow as the engine warms up. Lower temp coolant makes the ECM
richen the mix and after a certain time period will set a trouble code
because the engine isn't heating up to proper operating temperature.



--
Steve W.
 




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