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Username Post: Changing valve springs without removing heads. Any advice??        (Topic#191923)
IsItDoneYet? 
Senior Member
Posts: 1100
IsItDoneYet?
Age: 50
Loc: Covered in Oil N' Burnt R...
Reg: 12-14-05
06-14-08 12:33 PM - Post#1455633    

I am going to be changing the valve springs and valve stem oil seals on my BBC over the next few days.

Have the required tools but, as this is the first time I will have done this, was looking for the right and wrong way to go about it.

Any suggestions, pointers, gotchers???

P.
__________________
56 Bel Air Sedan, aka The Pumpkin. 28 Years and nearly done!
56 Chevy 3100 Big Window Stepside,aka The Pumpkin Patch Speed Shop! Moving under its own power at last...


 
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Nick P 
"8th Year" Gold Supporting Member
Posts: 5914
Nick P
Age: 66
Loc: De Queen, Arkansas
Reg: 10-15-03
06-14-08 01:38 PM - Post#1455655    
    In response to IsItDoneYet?

How fresh is everything, rings, valve job? Do you have the tools, Spring compressor, compressed air source, hose and adaptor? Pretty simple job. Are the springs the same diameter (OD)? Inners, ID? Do the seals fit inside the new springs?
Life is not the way it's supposed to be. It's the
way it is. The way you cope with it, is what makes
the difference.


 
ss57 
Senior Member
Posts: 1119
ss57
Loc: Lundsbrunn Sweden
Reg: 05-12-05
06-14-08 01:55 PM - Post#1455660    
    In response to Nick P

Not so hard to do...If everything is the same as the old set up, it will be easier!
A good tip I can give is, if you don´t plan (or don´t have the equipment) for the compressed air in the cylinder just take an old distrubitor wire and push in through the spark hole, that will stop the valve from falling down...
Stefan
www.picturetrail.com/ss57 (All cars and misc.)
www.photobucket.com/ss65 (Impala-65,and air- brushed 57)


 
IsItDoneYet? 
Senior Member
Posts: 1100
IsItDoneYet?
Age: 50
Loc: Covered in Oil N' Burnt R...
Reg: 12-14-05
06-14-08 02:18 PM - Post#1455672    
    In response to ss57

I have the spring compressor, hose and adapters and a compressor to provide the air.

I even have a new set of collets and a magnetic stick to retrieve the old ones if they go walkies!

I am freshening up the current set up using the same components etc. so I am hoping it will all just fit...famous last words...

Is this best to do with the piston at teh top of its stroke or the bottom?

Car is a manual.

Thanks

P.
56 Bel Air Sedan, aka The Pumpkin. 28 Years and nearly done!
56 Chevy 3100 Big Window Stepside,aka The Pumpkin Patch Speed Shop! Moving under its own power at last...


 
Rick_L 
Honored Member
Posts: 25626

Loc: Katy, Tx, USA
Reg: 07-06-00
06-14-08 02:49 PM - Post#1455685    
    In response to IsItDoneYet?

Do it with the piston at TDC.

The best compressor to use is the kind made from an industrial clamp that screws onto the rocker arm stud. Mine is a Mr. Gasket brand.

 
52chevybob 
Dedicated Enthusiast
Posts: 5628

Reg: 05-27-08
06-14-08 11:29 PM - Post#1455890    
    In response to Rick_L

If you're doing air method, do it with the piston at the bottom otherwise it will go there anyway.
The rope/sparkplug wire trick you want to GENTLY put the piston to the top as best you can. Don't use the starter motor to turn the engine!

 
Old Buzzard 
Contributor
Posts: 398

Loc: Madison, GA.
Reg: 10-13-07
06-15-08 05:50 AM - Post#1455936    
    In response to 52chevybob

Plug EVERY possible path for the keeper[s] you WILL manage to drop. A roll of paper towels IS your friend!!!
Chuck
Hotrodding and dragracing since 1955..
Injector inspector, and certifiable EFI nut.


 
2Loose 
"10th Year" Platinum Supporting Member
Posts: 4046
2Loose
Age: 72
Loc: Sandwich Isles
Reg: 03-17-03
06-15-08 12:48 PM - Post#1456222    
    In response to Old Buzzard

The one time I did this, having the pistons at TDC seemed to be enough. The valves didn't drop down much after the springs were removed. With the spark plugs removed, I turned the motor over very carefully by hand, and used the eraser end of a full length pencil to "feel" for the piston top to make sure it was all the way up. This was a car I bought for $50 because it was "burning oil" like a badly tuned diesel!!! Turned out the intake valve seals were gone, with pieces plugging up the oil return holes in the heads, so oil was building up under the valve covers and being sucked down the intake valves at an extremely high rate! New seals and a clean up and it quit burning oil! As Chuck said, plugging all the holes in the heads with rags or paper towels is definitely a requirement!!!
Good luck with it....
Aloha,
Willy

 
IsItDoneYet? 
Senior Member
Posts: 1100
IsItDoneYet?
Age: 50
Loc: Covered in Oil N' Burnt R...
Reg: 12-14-05
06-15-08 01:13 PM - Post#1456240    
    In response to 2Loose

Well guys I have to say a big thank you again for all the input.

Will make sure I take some pictures so you can all see how it went....

Well it will at least give you something to laugh about if it all goes a bit 'pete tong' (wrong)

I have enlisted the help of our very own Limey to help me out, will keep you posted.

Over and out,

P.
56 Bel Air Sedan, aka The Pumpkin. 28 Years and nearly done!
56 Chevy 3100 Big Window Stepside,aka The Pumpkin Patch Speed Shop! Moving under its own power at last...


 
george88gta 
"10th Year" Silver Supporting Member
Posts: 1757
george88gta
Loc: new york
Reg: 04-23-03
06-15-08 03:41 PM - Post#1456337    
    In response to IsItDoneYet?

I have done this a few times and if I can do it anyone can. I use the NAPA 775-9094 ( www.napaonline.com ) spring compressor. It is a bar type device. I have at least two of the type that sit over a spring and you turn the handle to compress the spring, but I find the bar type the easiest to use, if you have the room. I set the piston to TDC for this work. If you have a standard transmission, you can leave the car in gear to help prevent the engine from turning. Definetly plug all openings and try not to compress the spring any further than necessary to release the locks. I find that lightly tapping the top of the spring retainer, with a small hammer, helps to break the locks loose,before you compress the spring.

Edited by george88gta on 06-15-08 03:45 PM. Reason for edit: No reason given.

 
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