Burnt Valve?
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Burnt Valve?
I have an 87 bronco with the 302. My driver side header snapped close to the header back around November and I didn't get the chance to run exhaust back until last month. My truck started skipping real bad here lately, so I told a friend about it and he did the dollar bill to the exhaust pipe trick. Driver side pipe was trying to pull the bill in, and he said that I have a bad valve. Are those hard to replace or should I take it somewhere? Thanks in advance.
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Joined: Jan 2013
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From: Panama City
If you are mechanically inclined it is not a terrible job to perform, but not the easiest thing to do either. It involves removing most of the bolts that hold accessories on the front of the motor,removing the intake manifold, exhaust manifold and removing the head. And if you get really lucky you wont have any exhaust bolts break and have to fight them. Most likely will have to take the head to a machine shop and get valve seat either machined or replaced. And honestly since you are so far into it at this point you might as well bite the bullet and have both heads refurbished. But before you do all this you can verify whether it is a burnt valve or not. This can be done with a vacuum gauge . Do a search on the web for detailed instructions.
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An engine issue like that is such a difficult decision. You COULD just pop the head and replace the offending cyl head and a new gasket. The far better way is to pop BOTH heads and put two fresh new heads on.....but after all that work why not pull entire engine and do everything all right. I suppose it gets down to how attached to the thing you are.
A 1-side cyl head job is not that bad. #1 Biggest issue with one of these is not hyper-extending your knees and ending up a cripple. Kidding aside, one of the bigger issues is physical access to the engine. One of those step stools with the bar you can rest your belly on or something.
#2 is get Fact serv manual so you have all the torque specs to re-tighten everything properly.
#3 removing the rusty exhaust manifold bolts can be tricky, dont worry about snapping or stripping bolts. that old head is going away....but they have to come off
I did a 6 cyl on a jeep....much easier in that everything is paralell to ground and head stays in place better
A 1-side cyl head job is not that bad. #1 Biggest issue with one of these is not hyper-extending your knees and ending up a cripple. Kidding aside, one of the bigger issues is physical access to the engine. One of those step stools with the bar you can rest your belly on or something.
#2 is get Fact serv manual so you have all the torque specs to re-tighten everything properly.
#3 removing the rusty exhaust manifold bolts can be tricky, dont worry about snapping or stripping bolts. that old head is going away....but they have to come off
I did a 6 cyl on a jeep....much easier in that everything is paralell to ground and head stays in place better
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I'd judge everything by what kind of condition your bronco is in. If its got 200k miles and has rot holes in the floor boards you can put your fist through, maybe just a single head and call it done.
If its in nice shape and you want to keep it and restore it, I think just a single head you might be selling yourself a bit short. that 2nd one cant be far behind from needing some attention
If its in nice shape and you want to keep it and restore it, I think just a single head you might be selling yourself a bit short. that 2nd one cant be far behind from needing some attention
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