OK RFish I won't go there!Originally posted by RobaloFish:<br />To be exact -- Im blowing through the hose, which connects to the outside of the poppet valve cover. I can blow into this hose (by mouth) and it is very easy. (Dont even go there!!!!)<br /><snip><br />If i should not be able to blow into this line then this may be the key to my intermittent idle running warm problem. Not overheating just running warmer than normal.<br /><br />Thanks<br /><br />RFish >()>
<br /><br />As far as the warm idle thing goes, remember tha the t-stats control water flow at idle and the poppet controls water flow above idle (usually comes off seat around 9-11psi). How intermittant is the warm idle condition? Is there any specific running conditions that the situation occurs? Usually if the poppet is leaking, the engine will be running cold because the water doesn't stay in the block long enough to build heat. I would be more suspect of the thermostats than the poppet valve at this point.<br /><br />Good luck!OK I'll work with you on the poppet valve then. Pinching lines won't help you much, IF the poppet is sticking/not sealing then you can close it manually by drilling a hole in the cover at the rise in the center of the large diameter and manually closing the valve with a screwdriver. You will need to replace the cover ( I keep a spare one with the hole in my toolbox). The part number is 68729 1 (about $20.00). If that works, then you need to inspect the valve seat and plunger. It is possible that the seat is leaking around the outside of the seat. Check that out and let us know what you find out!<br /><br />Good luck!Originally posted by RobaloFish:<br />Stats are definitely good both have been changed; I was under the impression that if the poppet valve is sticking open this could effect the cooling at lower speeds due to the water being dumped too quickly out the poppet valve vs. through the thermostats. <br /><br />The water pressure also seems to be low at idle.<br /><br />The only other thing I can think of is to pinch off the hose or plug it and try running at idle to test no high-speed runs.<br /><br />Thanks -<br /><br />RFish >()>
OK I will try to explain. At idle, the thermostats control the water flow. When the engine is at low speed, the water pressure is relatively low (3-5psi) and the water will stay in the block and allow the engine to warm up. When the t-stats open, they allow water to flow through the hoses you are talking about, out of the engine. <br /><br />Above idle, the water pressure increases and the poppet valve control the water flow. When the water pressure reaches about 9-11 psi the valve opens and allow water to flow directly in the the exhaust flow through the adaptor plate and into the driveshaft housing (mid-section). So pinching the lines at the top of the engine will not help to determine if there is a leak at the poppet. <br /><br />I hope I was able to explain it. If it isn't clear, ask and I'll do my best to clear it up again!<br /><br />Good luck!Originally posted by RobaloFish:<br />Is the only water the poppet dumps, the water from the top of the block in the center? If so, if I block or pinch off the hose won't I be doing the same as a correctly working poppet valve at low speed. Not questioning your answer just trying to learn how it should work.<br /><br />Thank You<br /><br />RFish >()>
<br />tstat----------tstat<br />|<br />|<br />|........tell-tale<br />|<br />|<br />|adapter plate<br /><br />2) <br />output hose top of block<br />|<br />|<br />|.pressure takoff for pressure guage<br />|<br />|<br />|.poppet valve inlet<br /><br />With the 2 seperate paths I belive if I shut off the hose there is no way that the water can exit the poppet.<br /><br />??<br /><br />RFish >()> 
