E90mlcrd

[Steviegrewit]

Trying to figure out symptoms of a motor running hot, I’m afraid the last owner unhooked the temp sensors. I have been trying to replace the thermostats but the screws are seized. I can’t tell if the thermostats are opening like they should

 

[racerone]

The first thing I would do on a crossflow from 1984 is a compression test.----Post your numbers.-----Salt water motor ?-----Next I would inspect water pump impeller.

 

[Steviegrewit]

Freshwater setup I will do a comp. Test and get those posted, water is coming out of the tale tell . It’s peeing decent, I’m concerned about the thermostats tho I have been trying to replace them but the bolts are seized , someone told me not to worry about it , I was hoping to check them out to make sure there functioning properly and no debree is in them.

 

[Steviegrewit]

Does anybody kno what the poppet valves do or what they are for ? Do they open wen the thermostats closed to relieve water pressure? Or r they like a bypass if the thermostats are not functioning properly

 

[racerone]

At idle the thermostats control engine temperature.----When engine RPM increases the pressure opens poppit valves to allow extra water to circulate.

 

[Steviegrewit]

So if the thermostats were stuck closed it may run hot at an idle but would the poppets allow it to keep cool at more higher rpms

 

[racerone]

Post compression numbers first.----If they are good you can investigate further.