cooling system woes
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5th Wheeling
Joined: Apr 2013
Posts: 30
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cooling system woes
So, after doing a head job, I put everything back together and now I have this strange noise (in water pump) after the engine gets up to operating temp. Its like the water is boiling inside or I have air in the cooling system. I installed a new water pump and tried several times to burp the system of air, but not working. Changed from a 195 df to 180 df thermostat. Been parking it on an incline and leaving the cap off the radiator to let it burp. When I rev it up it sucks the coolant down so I know the pump is actually working. I installed an overflow tank. heater is on high and blowing hot air in cab. Never overtemps! Even went back and checked the head bolts and retorqued them. Any ideas? Thanks guys!
More Turbo
Joined: Aug 2002
Posts: 537
Likes: 17
From: Linden USA
Usually don't have air issues in these engines / trucks, but just in case lift the front of the truck with a jack, or on a hill and run with the rad cap off to burp all the air out. I would try that first.
Elder User
Joined: Jan 2011
Posts: 831
Likes: 1
From: Tanilba bay NSW Australia
umm, you havent got the head gaskets around the wrong way?
hope not. That may be airlocking the head cooling passages.
Is the thermostat correct.
may sound like a stupid question, but I've heard a lot of mistakes from parts stores giving out windsor stats and they are not right.
hope not. That may be airlocking the head cooling passages.
Is the thermostat correct.
may sound like a stupid question, but I've heard a lot of mistakes from parts stores giving out windsor stats and they are not right.
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5th Wheeling
Joined: Apr 2013
Posts: 30
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I made sure the head gaskets were in the right direction- stamped "front" on Felpro gaskets. I checked the t-stat also. Made sure it was the correct one. Did a lot of research on that too. Thanks for the reminder. I'm going to pull the water pump and replace with another new one and see if that helps. If the gasket was leaking, wouldn't I see some indication in the exhaust at the tailpipe? The noise is localized at the water pump too. ????? Puzzled! ????
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5th Wheeling
Joined: Apr 2013
Posts: 30
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No, doesn't overheat at all. The noise just makes me a little nervous. Concerned I might be starving the engine some cooling in the block. Don't want to cook something. Its really noisy when you come up to a stop or idle. You can hear it from 10' away.
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Elder User
Joined: Jan 2011
Posts: 831
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From: Tanilba bay NSW Australia
You are right bearT. But that is why That's why I asked if he had the right Tstat. 351 has a pressed thingie, while the 400 has it cast-or is it the other way around? Just make sure it isn't a windsor one
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5th Wheeling
Joined: Apr 2013
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Yeah, very certain I have the T-stat in the right way and the proper one. I read up on the peculiarities of the ford 400 and made sure I got the right one. Some members even suggested drilling one or two 1/8" holes in the stat to allow the air to escape as its warming up. Tried that also. Still the same.
Elder User
Joined: Jan 2011
Posts: 831
Likes: 1
From: Tanilba bay NSW Australia
Right-not much left then-have you tried running around without the rad cap on? Now you have said you already replaced the water pump-something rings a bell about being in reverse if you have the wrong one-someone else may be able to confirm this but A-can a windsor one be fitted, and B-does it spin the right way. I don't know but there is something needleing the memory banks about that one.
Postmaster
Joined: Mar 2011
Posts: 2,698
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From: Taxachusetts
Agreed.
Is the noise consistent...as a lifter tick type noise?
But with the replacement of the water pump, I can't help but think of the pump's bolt placements. Various dimensions.....in particular, the one by the fuel pump arm. Probably way off here...just a thought.
Posting Guru
Joined: Nov 2008
Posts: 1,937
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From: wyoming
little outside the box!
water pump check. check the clearance between plate to impellar. About .005 max. clearance should help prevent bypass within pump. On your heater hoses does one have a restricted port to heater core? checking impellar clearance can be checked with a piece of glass laid on top and use a feeler gage for reference. next the gasket thickness is figured into clearance. but if the pump has to much impellar clearance your just creating more problems. Reason I'm going this way is because of quality control these days is not so good! Assume nothing is my policy and still probably not enough! good luck!
