03-09-2012, 06:08 PM #1
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,
03-09-2012, 06:13 PM #2
- Join Date
- Aug 2006
- Homer Glen Il.
on all the 4strokes i've ever seen you need air to hold up the valve or it will fall in
03-09-2012, 07:12 PM #3
03-09-2012, 08:07 PM #4
I guess a BMW with high compression and pistons with the high domes will not let the valves drop,
03-10-2012, 02:44 AM #5
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...
03-10-2012, 02:56 AM #6
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.
03-10-2012, 03:26 AM #7
- Join Date
- Oct 2007
03-10-2012, 03:41 AM #8
03-10-2012, 11:59 AM #9
03-10-2012, 02:42 PM #10
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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