how or why would a clogged injector in my dads 95 302 cause a hole in the piston and would he have to replace motor or just get new pistons?

 

It was running too lean on that cylinder because there less fuel with the same amount of air intake. The decreased amount of fuel caused a hotter burning mixture .

I hope this helps

 

thats what i thought but do u think he will need to replace the motor or just the pistons?

 

Its a chain reaction when you replace pistons. You know you need to replace the one with the hole, so to get it out you must disassemble the engine. You can't just buy 1 piston and 1 set of rings so you buy the set plus related gaskets and seals. Before this you should check to see if there is any block damage an make sure the block is rebuildable (decks are straight, bores are round, etc.). If not you need to bring it to a machine shop. Then you need to replace the rings, rod bearings, and while your there main bearings, because you can't reassemble an engine with used wear components (it'll last a week tops). Now the whole bottom end is done and we haven't even talked about changing the cam or replacing/rebuilding the possibly damaged heads. Plus you might as well fix up the fuel system that created the problem.

See how an internal problem chain reacts? Of course you could just replace that piston and rings and rod bearings, but you'll have nothing but future problems. Your best bet is to find a low mileage motor and swap it in. Good Luck!

 

I would just replace the damaged piston and the injectors. I don't see how it could have hurt anything else. But I would have a mechanic look over the entire engine just to make sure nothing else was damaged. Just my 2 cents.

 

Oops. After reading crashz's post, I did'nt know you could'nt buy just one piston. Sorry. I think crashz is right, if you can find a good 302 somewhere go for it. It would be better than paying a mechanic(or doing it yourself) to tear down the engine and fix it. You would pay more for parts and labor, than if you just bought a used 302.

 

I have a 92 302 truck engine in right now that I am rebuilding. With all new components minus new injectors. you will be looking at about $1300-1500 aprox. That is if you do all the work yourself(exept machine work). If you have a shop do it it will be anywhere from $2600-3500 depending on the shop. If this truck is worth that to you then there is no question. Does the transmission shift properly or do the brakes need repaired. These are all things you will need to look at when taking on a big job like this.

If you are willing to put a used engine in then you will be taking a gamble on the other engine. I have had used engines that have lasted 25000 miles and 125000 miles. Even if you do go this way you really should look into replacing the hoses and thermostat, plugs,wires,cap and rotor, air filter, of couse engine oil, and things like that. It will be a whole lot easier to do it now.
Hope this helps.
Good luck with you choice,
Mike