puking antifreez w/ new motor

cop-coupe · 10-30-2004, 08:17 PM

We just got my new 306 fired up it wont hold idel and is puking antifreez when we shut it down after only runing maybe 30 seconds. could this be a air lock or a stuck t-stat. or worse a head gasket but it isnt bubbling when it is running, one time it forced it out of the overflow with the rad. cap on, the next time we left the cap off and it really shot out. please help..

mustangII460 · 10-30-2004, 08:44 PM

Timing.

T-stat closed will puke it back out the rad. Not installed the right direction can do this. Does the upper hose get hot at all?

Correct rotation water pump?

grey88gt · 10-31-2004, 12:08 AM

A friend of mine had someone build a 460 for him and they didnt check the heads for cracks. It had a cracked head, and as long as it was running it didnt blow out any water. Had a 5.0 in an older Capri and it had a cracked block thru one of the middle cylinder head bolt holes in the block, it did the same thing your describing. Probally isnt your problem just food for thought. Hope you figure it out soon.

Dark_5.0 · 10-31-2004, 12:19 AM

If the T-stat is installed correctly and you have the correct rotation water pump then unfortunately it is a head gasket leaking compression into the coolant passage

~The Jester~ · 10-31-2004, 08:00 PM

First thing I'd check is the water pump, make sure it's a reverse rotation, and that the thermostat is working, and installed in the right direction. Second, pressure test the cooling system. Also look for water in the oil pan, that's a gimme that you're tearing her apart again.

10-30-2004, 08:17 PM	#1
cop-coupe Registered Member Join Date: Apr 1999 Location: belleville IL. Posts: 60	puking antifreez w/ new motor We just got my new 306 fired up it wont hold idel and is puking antifreez when we shut it down after only runing maybe 30 seconds. could this be a air lock or a stuck t-stat. or worse a head gasket but it isnt bubbling when it is running, one time it forced it out of the overflow with the rad. cap on, the next time we left the cap off and it really shot out. please help.. __________________ 1990 spec. serv. coupe w/306 (Indy Perf. Mustang Not Recomended), C-4 w/3000 stall, b-303, gt-40 heads and intake, 1.6rr, 1" spacer, fms valve covers, mac cold air intake, bbk equil shorties, Mac pro chamber, 2.5" flows, under drives, 65mm t.b. , fms 9mm wires, trunck mount battery, 24lb inj., 73mm C&L, 155lph pump. msd digital 6a, flex-a-lite,

10-30-2004, 08:44 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Re: puking antifreez w/ new motor Timing. T-stat closed will puke it back out the rad. Not installed the right direction can do this. Does the upper hose get hot at all? Correct rotation water pump? __________________ Frank

10-31-2004, 12:08 AM	#3
grey88gt Registered Member Join Date: Feb 2004 Location: Skiatook, Oklahoma Posts: 193	Re: puking antifreez w/ new motor A friend of mine had someone build a 460 for him and they didnt check the heads for cracks. It had a cracked head, and as long as it was running it didnt blow out any water. Had a 5.0 in an older Capri and it had a cracked block thru one of the middle cylinder head bolt holes in the block, it did the same thing your describing. Probally isnt your problem just food for thought. Hope you figure it out soon.

10-31-2004, 12:19 AM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: puking antifreez w/ new motor If the T-stat is installed correctly and you have the correct rotation water pump then unfortunately it is a head gasket leaking compression into the coolant passage __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

10-31-2004, 08:00 PM	#5
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: puking antifreez w/ new motor First thing I'd check is the water pump, make sure it's a reverse rotation, and that the thermostat is working, and installed in the right direction. Second, pressure test the cooling system. Also look for water in the oil pan, that's a gimme that you're tearing her apart again. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

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