How bad is it?
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Senior User
Joined: Apr 2006
Posts: 186
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How bad is it?
OK, I have a '87 f150 with the 300 I6. It's been overheating and I cant seem to fix it. The temp gauge doesent go over the halfway point but the radaitor cap will start blowing over coolant into the overflow tank and that will overflow the overflow tank. Now what I have done to the truck, replaced the water pump, fan clutch, thermostat,flushed and cleaned the radaitor, new belt and coolant. Im leaning twardes a head gasket now since I cant think of anything else and there is alot of water and steam comeing out of the tail pipe. So, if you guys can think of anything else that I may have overlooked Please let me know as I need to get this truck back on the road ASAP. thank you much.
Super Moderator
Joined: Apr 2004
Posts: 34,527
Likes: 2,830
Water and steam out the pipe. You have to ask?
Does the coolant look like a carbonated soda? Lots of little bubbles and some fuel?
Any of the plugs wet after shutdown?
If yes, that just confirms the head gasket, so as the Pontiac guys used to do, Get your Tools Out.
Does the coolant look like a carbonated soda? Lots of little bubbles and some fuel?
Any of the plugs wet after shutdown?
If yes, that just confirms the head gasket, so as the Pontiac guys used to do, Get your Tools Out.
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Do not modify an EFI head.
Polishing the exhaust ports is about as far as I would go.
If you are having overheating probloms I would install a mechanical temp gauge also.
If you are replacing the headgasket I would spend the $100 and have the valves ground and the head re-surfaced.
Polishing the exhaust ports is about as far as I would go.
If you are having overheating probloms I would install a mechanical temp gauge also.
If you are replacing the headgasket I would spend the $100 and have the valves ground and the head re-surfaced.
Lead Driver
Joined: Mar 2008
Posts: 7,195
Likes: 387
From: Near Los Angeles
Do not modify an EFI head.
Polishing the exhaust ports is about as far as I would go.
If you are having overheating probloms I would install a mechanical temp gauge also.
If you are replacing the headgasket I would spend the $100 and have the valves ground and the head re-surfaced.
Polishing the exhaust ports is about as far as I would go.
If you are having overheating probloms I would install a mechanical temp gauge also.
If you are replacing the headgasket I would spend the $100 and have the valves ground and the head re-surfaced.
