Boss 302 engine locked

I

iamlance

New Member

Sep 18, 2004

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Jun 26, 2005

#1

• Jun 26, 2005

• #1

A friend of mine has a 70 Boss 302 that has been in his barn for about 12 years. Car ran fine when parked. We tried turning the motor over with a breaker bar and socket on the dampner but it won't budge. He put mystery oil in the cylinders and left it for a few days and tried again, no luck. Any suggestions??? (other than hanging him by his ba!z for letting this happen)
He's owned the car since 72. All original, no shaker, no slats, 74K miles. What a dope.

 

G

gjz30075

Member

Aug 30, 2004

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Roswell, Ga

Jun 26, 2005

#2

• Jun 26, 2005

• #2

Use some PB Blaster. Great stuff. Let it sit for a few days, then spray some more. Make sure you're in neutral, too.

 

dennis112

15 Year Member

May 15, 2005

1,561

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79

Amish Wonderland of Central PA.

Jun 26, 2005

#3

• Jun 26, 2005

• #3

gjz30075 said:

Use some PB Blaster. Great stuff. Let it sit for a few days, then spray some more. Make sure you're in neutral, too.

Click to expand...

Also, remove the starter or bellhousing lower cover and pry there instead. You should be able to get a little more leverage.

On second thought, if it is that froze up the a rebuild is in order. Pretty sure the rings will be trashed and the pistons will scuff if you run it. :damnit:

 

ashford

Member

Dec 19, 2003

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fargo ND

Jun 26, 2005

#4

• Jun 26, 2005

• #4

fill her with diesel down the spark plug holes and let it sit then tow it and let out the clutch. my brother did this to his 57 and the thing ran aferwards and killed all the mosqitoes within a 3 mile radius

 

Hack

15 Year Member

Mar 23, 2004

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Minneapolis

Jun 26, 2005

#5

• Jun 26, 2005

• #5

I wouldn't try to start it either. That engine is worth too much to do that with. It should be pulled apart as gently as possible. Hopefully he will be able to get away with a hone on the cylinders. If you break it loose I would think your odds of making a big scratch inside a cylinder are higher.

 

J

johnsstang04

Member

Jun 26, 2005

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Phoenix, Arizona

Jun 26, 2005

#6

• Jun 26, 2005

• #6

Rebuild it.... don't even think of turning it over. I have seen many engines damaged because people attempted to turn them over while they were ceased.

 

6

65stang289

New Member

Mar 5, 2003

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Fort walton Beach FL.

Jun 26, 2005

#7

• Jun 26, 2005

• #7

I would go the PB blaster way and give her hell if that does not work then take her apart

 

J

johnsstang04

Member

Jun 26, 2005

80

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7

Phoenix, Arizona

Jun 26, 2005

#8

• Jun 26, 2005

• #8

I just don't think its worth taking any chance of screwing the engine up. Clearly there was nothing wrong with it before it was put in the garage, so why mess it up now.

 

1

10secgoal

Active Member

Dec 1, 2003

2,801

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San Diego

Jun 26, 2005

#9

• Jun 26, 2005

• #9

Pull that piece of junk out and send it to my house.

 

I

iamlance

New Member

Sep 18, 2004

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Jun 26, 2005

#10

• Jun 26, 2005

• #10

It's a boat anchor!! I told him to put a small block chevy in it.

 

D

D.Hearne

New Member

Sep 29, 2000

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south louisiana

Jun 27, 2005

#11

• Jun 27, 2005

• #11

Hack said:

I wouldn't try to start it either. That engine is worth too much to do that with. It should be pulled apart as gently as possible. Hopefully he will be able to get away with a hone on the cylinders. If you break it loose I would think your odds of making a big scratch inside a cylinder are higher.

Click to expand...

I second this 100% Or just give up and hand it over to me.

 

Hack

15 Year Member

Mar 23, 2004

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Minneapolis

Jun 27, 2005

#12

• Jun 27, 2005

• #12

D.Hearne said:

Or just give up and hand it over to me.

Click to expand...

Now why didn't I think of that??

:damnit:

 

1

10secgoal

Active Member

Dec 1, 2003

2,801

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San Diego

Jun 27, 2005

#13

• Jun 27, 2005

• #13

D.Hearne said:

I second this 100% Or just give up and hand it over to me.

Click to expand...

You'll have to wait for it, I posted it first. I don't really want it at my house, but I would help him out to get it off his hands though.

 

krash kendall

Active Member

Nov 19, 2004

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Aldergrove, B.C. Canada

Jun 27, 2005

#14

• Jun 27, 2005

• #14

ashford said:

fill her with diesel down the spark plug holes and let it sit

Click to expand...

This does work well, just not completely recommended for this car/motor. A Honda civic or Pinto wagon maybe?

 

ashford

Member

Dec 19, 2003

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16

fargo ND

Jun 27, 2005

#15

• Jun 27, 2005

• #15

any way you look at it you need to free the pistons from the cylinders. the two ways of doing it is in the car or on the stand. in the car you pull it then let out the clutch in high gear or on the stand you have to pull what piston out you can then pull the crank then hammer the remaining piston(s) out. i had to do this to a 289 once, later i took it to a machinist and a .030 bore didnt clean it up a .040 barely took care of it.
doing it in the car is easier, and no you dont have to start it just turn it over once or twice. doing it on the stand is a bit more delicate, and a whoops here can cause more damage than trying to pull it.

 

mustang70

Founding Member

Nov 15, 2001

2,445

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48

San Diego

Jun 27, 2005

#16

• Jun 27, 2005

• #16

I've heard of people using ATF to help unlock pistons. Pour some into each cylinder and let it soak over night.

 

D

D.Hearne

New Member

Sep 29, 2000

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south louisiana

Jun 27, 2005

#17

• Jun 27, 2005

• #17

I've done the ATF thing lots of times, I just don't recommend it in this case, not with a rare and valuable engine as an original Boss 302. Neither would I ever contemplate "pull" starting it to free the pistons. You'll likely do irreparable damage that way to more than just the engine. Good way to damage the rearend and transmission.

 

1

10secgoal

Active Member

Dec 1, 2003

2,801

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San Diego

Jun 28, 2005

#18

• Jun 28, 2005

• #18

I guess if the block were out, you could pull the pistons thru the bottom of the motor. Won't come completely out, but far enough down you could break and remove the rings. This would give you a little more room to slide the out the top. Or if you left them down, you would have tons of room to work with the cylinder walls, to get them clean to slide the slugs out.