No power/overheating problem
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Senior User
Joined: Aug 2002
Posts: 247
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From: "The Backroads"
No power/overheating problem
I have a 71 f100 4x4.It has a 360 Fe engine /np435 manual transmission/3.50 gear ratio/33” tires. When I climb steep hills it has a problem.Recently I pulled my 16' camp trailer up a grade and I have to take that hill in 2nd and third gear.Some places I was doing 20 mph. It had no power I had my foot in it most of the way and could not get any faster than 35 mph.I was the slowest on the road,I had trucks older than mine passing me pulling much larger trailers.Then the engine overheated and the transmission got extemely hot and began to leak. I did a test and climbed the same grade with just the truck and could only do 55mph with my foot in it.What could cause this problem???? Could it be my clutch is slipping and needs adjustment, or maybe my engine is just wiped out or possibly the gear ratio?? I have been told that the gear ratio is fine. Can anyone help me here??
Senior User
Joined: Jan 2003
Posts: 382
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From: Bonney Lake,WA USA
No power/overheating problem
Has it always had a problem with hills? Check your timing and dwell if you are still running points. Also, have the vac mod checked. Make sure to set the dwell first before timing it.
If any of this makes a differance I would think about purchasing a new dist and have it recurved by a dist shop. They can tune it to the specs of the trucks drivetrain and what you use it for. I had my dist recurved and it made all the differance in the world.
First, make sure your problem lies within the dist before spending the cash. Hope this helps, good luck. Greg
If any of this makes a differance I would think about purchasing a new dist and have it recurved by a dist shop. They can tune it to the specs of the trucks drivetrain and what you use it for. I had my dist recurved and it made all the differance in the world.
First, make sure your problem lies within the dist before spending the cash. Hope this helps, good luck. Greg
New User
Joined: Jul 2003
Posts: 19
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From: Bend, OR.
No power/overheating problem
There is a lot of variables here (how steep was the hill, how worn out is the motor........*G*) but I'll take a stab at it.
Check carefully for a vacuum leak at the carb or intake manifold. If you have a serious vacuum leak the engine will be running lean and running hot, and will be way down on power under load. It's possible that the 2 problems are not actualy connected even though they occur at the same time - it could be overheating because it was under a heavy load and not running well, and not much air flow through the radiator at 20 MPH. If you get the engine running right then you can make the hill at speed and it won't overheat.
Have you checked the "normal" stuff like tune-up, timing, filters, etc..?
Check carefully for a vacuum leak at the carb or intake manifold. If you have a serious vacuum leak the engine will be running lean and running hot, and will be way down on power under load. It's possible that the 2 problems are not actualy connected even though they occur at the same time - it could be overheating because it was under a heavy load and not running well, and not much air flow through the radiator at 20 MPH. If you get the engine running right then you can make the hill at speed and it won't overheat.
Have you checked the "normal" stuff like tune-up, timing, filters, etc..?
