Overheating with rebuilt engine

freakingmartin · 04-25-2016, 03:06 AM

Hey I just started noticing the coolant Reservoir boiling when I rev or drive the car really quick ...I'm gonna change the thermostat but any other ideas would be great

btwilson86 · 04-25-2016, 06:29 PM

Coolant overflow should not be getting coolant in it until the cooling system pressure exceeds the cap spring pressure (16 PSI, I believe). Verify your cap is opening at the correct pressure and not early

freakingmartin · 04-25-2016, 09:01 PM

Quote:

Originally Posted by btwilson86

Coolant overflow should not be getting coolant in it until the cooling system pressure exceeds the cap spring pressure (16 PSI, I believe). Verify your cap is opening at the correct pressure and not early

Yea I think it's early but this never happened before

Bru · 04-25-2016, 11:55 PM

If the over flow tank over flows onto the ground after shutdown, could be the head gasket going. Check the there is no air in the system and that the fluid is drawn back into the radiator when cooled. I had the hose at the radiator develop a air leak that prevented the normal fluid drawback. If you want to check the block thermostat, take it out and heat it to boiling in water. It should be fully open by 190 deg F. Water boils at 212 F. The little jiggle valve goes up when installing. Be careful not the over tighten the 2 screws (or use ones that are too long), the aluminum in the head strips easily. I use a thin layer of silicone as well here. Antifreeze should be 50/50 to 70/30 (antifreeze/water) using distilled water to dilute when 100% concentrate is used. Floating ball testers can be helpful to test what you have in the system now. Never use tap water. Walmart has distilled water for 63 cents a gallon.

cre · 04-26-2016, 01:29 AM

If it is hitting normal operating temps very rapidly and really seems to be trying to overheat then double check your timing both mechanical and ignition... start with the ignition and distributor's timing.

04-25-2016, 03:06 AM	#1
freakingmartin Stock Join Date: Mar 2016 Location: CA Posts: 3	Overheating with rebuilt engine Hey I just started noticing the coolant Reservoir boiling when I rev or drive the car really quick ...I'm gonna change the thermostat but any other ideas would be great

04-25-2016, 06:29 PM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Coolant overflow should not be getting coolant in it until the cooling system pressure exceeds the cap spring pressure (16 PSI, I believe). Verify your cap is opening at the correct pressure and not early __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

04-26-2016, 01:29 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If it is hitting normal operating temps very rapidly and really seems to be trying to overheat then double check your timing both mechanical and ignition... start with the ignition and distributor's timing. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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04-25-2016, 11:55 PM	#4
Bru Bone Stock w Upgrades ;-) Join Date: Apr 2010 Location: Tampa Bay Posts: 202	If the over flow tank over flows onto the ground after shutdown, could be the head gasket going. Check the there is no air in the system and that the fluid is drawn back into the radiator when cooled. I had the hose at the radiator develop a air leak that prevented the normal fluid drawback. If you want to check the block thermostat, take it out and heat it to boiling in water. It should be fully open by 190 deg F. Water boils at 212 F. The little jiggle valve goes up when installing. Be careful not the over tighten the 2 screws (or use ones that are too long), the aluminum in the head strips easily. I use a thin layer of silicone as well here. Antifreeze should be 50/50 to 70/30 (antifreeze/water) using distilled water to dilute when 100% concentrate is used. Floating ball testers can be helpful to test what you have in the system now. Never use tap water. Walmart has distilled water for 63 cents a gallon.