Rebuilt a 3100

[CuttySup]

My shop teacher is making everyone in the class tear down and rebuild an engine. We have several engines to choose from, but I chose one of our 3100s. It took me about 45 minutes with an impact wrench and a dead blow mallet to tear it down to the bare block--no crankshaft, no pistons, no nothing. Today, after assembling all the parts and hardware from a plastic tote onto the workbench, I began the rebuild. This is something I have never done before. I cheated a little by taking the rings out of the pistons so they would slide up into the block a little easier. It took me less than 2 hours to assemble the bottom half of the engine: the pistons, crank, camshaft, oil pump and pan. Tomorrow I'll finish it off with the top half. I would never want to drive a car with that engine down the road, mainly because I lost some bolts along with 9 pushrods in the tear down process. It was just a very good and fun experience.

[1990lumina]

Cool!

[runt]

I'm gonna assume that the engine doesn't have to run or anything afterwards, right?

[dbtk2]

My shop teacher is making everyone in the class tear down and rebuild an engine. We have several engines to choose from, but I chose one of our 3100s. It took me about 45 minutes with an impact wrench and a dead blow mallet to tear it down to the bare block--no crankshaft, no pistons, no nothing. Today, after assembling all the parts and hardware from a plastic tote onto the workbench, I began the rebuild. This is something I have never done before. I cheated a little by taking the rings out of the pistons so they would slide up into the block a little easier. It took me less than 2 hours to assemble the bottom half of the engine: the pistons, crank, camshaft, oil pump and pan. Tomorrow I'll finish it off with the top half. I would never want to drive a car with that engine down the road, mainly because I lost some bolts along with 9 pushrods in the tear down process. It was just a very good and fun experience.

 

That and the fact that it doesn't have any rings...

 

Shawn

[no1kicker]

Nice. What class are you taking, is it an auto class at high school, or are you at a tech school or what?

[terryk2003]

I would never want to drive a car with that engine down the road, mainly because I lost some bolts along with 9 pushrods in the tear down process.

 

[White93z34]

it oughta have some killer compression

[CutThroat96]

i got auto shop in high school too. we have about 10 complete Quad 4's just laying around.

 

and putting pistons back in without the rings defeats the purpose of learning how to rebuild! your supposed to put the pistons into the top of the block.... not 'up in the block' like you said. put the ring compressor around the piston, have someone tap the piston in, and have someone guide it down so it doesnt hit the crank.

[CuttySup]

i got auto shop in high school too. we have about 10 complete Quad 4's just laying around.

 

and putting pistons back in without the rings defeats the purpose of learning how to rebuild! your supposed to put the pistons into the top of the block.... not 'up in the block' like you said. put the ring compressor around the piston, have someone tap the piston in, and have someone guide it down so it doesnt hit the crank.

The engine was upside-down on the stand, with the crankshaft in, and I put the pistons in from the bottom (top). Like I said, it was my first time, and the engine will never run again, so it didn't matter. I found out why it puked in the first place, though. Looks like someone may have run it without oil

[Bossman429]

As long as you had fun, and learned something it doesn't matter if it runs afterwards, especially if it doesn't need to.

When I took auto tech in HS I got to tear down a Caddilac 500 cube motor. It was freakin huge! I wish I could have done a 60 degree V6 though.

[Brian P]

Man, all my HS class had me mess with was a lawn mower engine....my own, at that!

[CuttySup]

I didn't know that I had to rebuild it, so I was just taking things apart, and throwing them aside. Then my teacher says, "I hope you are remembering where everything goes!"

[jeremy]

Like I said, it was my first time, and the engine will never run again, so it didn't matter.

 

sounds like a good time, but isn't the purpose of "rebuilding" an engine to get it to run again?

[CuttySup]

Like I said, it was my first time, and the engine will never run again, so it didn't matter.

 

sounds like a good time, but isn't the purpose of "rebuilding" an engine to get it to run again?

Not in this case. I think the purpose of the assignment was just to teach how an engine works inside. The engine that I used was one that he had laying in the corner of the shop. It was obvious that it hadn't been running in a long time. Besides, rebuilding it to make it run again would cost money, something that public schools don't have right now.

[Carotop]

Is this in a HS auto class? We never got to do shit like that!!!

[jeremy]

sounds like a good time, but isn't the purpose of "rebuilding" an engine to get it to run again?

Not in this case. I think the purpose of the assignment was just to teach how an engine works inside. The engine that I used was one that he had laying in the corner of the shop. It was obvious that it hadn't been running in a long time. Besides, rebuilding it to make it run again would cost money, something that public schools don't have right now.

 

that would just be a disassemble and then a resassemble then ..........but like I said before, very cool to do none the less

[CuttySup]

Is this in a HS auto class? We never got to do shit like that!!!

Yeah, it's a high school class. We do a lot of cool stuff like build a demolition derby car, rebuild engines, take cars apart, etc.