Piston rings rusted to bore - Page 2 - PeachParts Mercedes-Benz Forum

Clemson88 · #16 03-28-2012, 06:53 AM

Coat the cylinders with Crisco, put it back together and change the oil after you've run it long enough to get the oil hot.

pixelsblack009 · #17 03-28-2012, 09:37 AM

What about the play people? I need to know

Thanks

t walgamuth · #18 03-28-2012, 10:46 AM

there really should not be any play. you need to investigate and see if it is in the rod pins or the crank pully. Nothing good from play can I imagine if it is manifested at the piston.

Clemson88 · #19 03-28-2012, 11:11 AM

Try this.

Turn the crank and catch a piston moving down. Stop turning and push down on the piston. If you can move it downward by hand you've got a rod bearing or wrist pin problem. Try each piston with the same experiment.

Are you referring to side-to-side play of the piston?

whunter · #20 03-28-2012, 01:46 PM

Quote:

Originally Posted by pixelsblack009

If you were to sort of jiggle the crank pulley back and forth is it normal to have some play in the movement of the pistons?

* Slop in the crankshaft = bad bearings.

* Excess piston rocking = bad oval cylinder sleeve and/or damaged piston/wrist pin.

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whunter · #21 03-28-2012, 01:48 PM

Quote:

Originally Posted by pixelsblack009

Hi So I'd taken the head out on my W115 240D to do a valve seat job, and it took some time, now when I went to turn the engine over by hand at the crank shaft pulley it seemed jammed and when I applied some force it came loose and the pistons started to move, it seemed the piston rings had rusted themselves onto the bore and now there's a little lip on the bore where it had rusted itself, so my question is can anything be done besides re-boring and slewing the engine? someone said it can be rubbed off with a very fine sand paper, is this true? also there is some surface rust at the bottom of the bore where I can reach but the piston ring rides obviously

VIN# please.

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