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  1. #1
    skigolfnut's Avatar
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    Changing valve springs and retainers question?

    My brother works at a BMW/Mercedes shop locally and he was saying that if I can rotate the flywheel and move the piston up to the top of the cylinder, I can change the springs without using air to push up the valves?
    Has any one else done this with success?
    I have the air adapter for the spark plug hole but it is a 20 mile drive to the shop with the air compressor,
    thanks,


  2. #2

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    on all the 4strokes i've ever seen you need air to hold up the valve or it will fall in

  3. #3
    Fast & Loud meeper's Avatar
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    Quote Originally Posted by skigolfnut View Post
    My brother works at a BMW/Mercedes shop locally and he was saying that if I can rotate the flywheel and move the piston up to the top of the cylinder, I can change the springs without using air to push up the valves?
    Has any one else done this with success?
    I have the air adapter for the spark plug hole but it is a 20 mile drive to the shop with the air compressor,
    thanks,
    with the reliefs in the OEM pistons it just won't work... i've never ever hear of that working on any motor for that mater

  4. #4
    skigolfnut's Avatar
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    I guess a BMW with high compression and pistons with the high domes will not let the valves drop,

  5. #5
    Electronics Guru Alpheus's Avatar
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    Im not telling you to do this, but I seen the drag racers at the track put nylon rope down in the cylinder through the plug hole with the piston half a stroke down from TDC, then rotate the engine gently (making sure that its on the compression stroke) so the rope balls up and holds the valves in place. They would change the valve springs, then rotate the engine backwards and pull the rope out...

  6. #6
    monaroman76's Avatar
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    I think you can do it the way you mentioned OP, but it's not advised. The valves will bend easy and if you get a keeper stick to a retainer and press the valve into the piston, you may cause damage.

  7. #7

    Talking Yessssssssss

    Quote Originally Posted by monaroman76 View Post
    I think you can do it the way you mentioned OP, but it's not advised. The valves will bend easy and if you get a keeper stick to a retainer and press the valve into the piston, you may cause damage.
    Your brother is right,you can replace the valve without air,his solution is correct,in so many substitutions valve may be Ionly used 2 times the air. Ciao

  8. #8
    richrxp's Avatar
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    This works great,i have done mine springs and retainers this way,no problems !
    Without the rope works also,you can retrieve the valve if it drops down,but with the rope you block it.


    Quote Originally Posted by Alpheus View Post
    Im not telling you to do this, but I seen the drag racers at the track put nylon rope down in the cylinder through the plug hole with the piston half a stroke down from TDC, then rotate the engine gently (making sure that its on the compression stroke) so the rope balls up and holds the valves in place. They would change the valve springs, then rotate the engine backwards and pull the rope out...

  9. #9
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by skigolfnut View Post
    My brother works at a BMW/Mercedes shop locally and he was saying that if I can rotate the flywheel and move the piston up to the top of the cylinder, I can change the springs without using air to push up the valves?
    Has any one else done this with success?
    I have the air adapter for the spark plug hole but it is a 20 mile drive to the shop with the air compressor,
    thanks,
    I've seen it done without compressed air.......it depends on how well the valve seal (tension) holds the valve up. Personally, I'd use an air compressor. If the valve drops.....well......

  10. #10
    GRF + DashPac:) seadoo02xp's Avatar
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    You can do it this way but if you have the fitting why not use it. These engines are not in any way related to Mercedes engines, Mercedes dont typically break springs or retainers, they wear guides out so the heads always have to come off,

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