Rebuild/Pistons question - Page 2 - PeachParts Mercedes-Benz Forum

leathermang · #16 01-08-2007, 09:19 PM

Quote:

Originally Posted by Chas H

I have looked at a FSM, not recently. Is there a proscription against over boring the block?
By the time you guys dick around saving old pistons, replacing and finishing to size liners, ordering special rings of unknown quality etc. you'll be money and time behind simply overboring the block and fitting oversize pistons.

Was it a FSM for a 617.952 engine ?
Have you checked to see how much turbo annular oil cooling ring pistons cost ?

Yes , there is a proscription against over boring the block.
First as hinted above concerning the cost of oversized ( or even stock ) pistons...
Second, this is a sleeved engine. It is made to have the sleeve pulled out and new sleeve pressed in... then you take each piston you have and measure it...and then bore and hone that hole to the correct size for the piston going into it. Look at the price of the sleeves.. CHEAP compared to proper machine work ... ( aside from the fact that the FSM says to replace them ) .
You sound like you are lacking in the kind of attention to detail which is required to rebuild these engines and get satisfactory life from them afterward...
We study the FSM and have them at our elbows when working on these engines... as compared to dashing off advice from ' looking' at ' A ' FSM long ago...
At the very least you are taking a chance on misleading some newbie in a serious and costly manner...

Chas H · #17 01-08-2007, 10:34 PM

What is the proscription in the FSM against boring the block?
The OP has stated that his engine has 400k mi on it and is concerned that the original pistons may not be servicable. Buying new pistons and new liners seems to me to be wasting money.
And save your pedantic lectures for someone that cares.

t walgamuth · #18 01-09-2007, 08:01 AM

wooohoooo!

tom w

t walgamuth · #19 01-09-2007, 08:03 AM

Quote:

Originally Posted by Knightrider966

A really good machine shop would come in really handy here! Do you know anyone you really trust in the business or someone who could give you a recommendation? You don't want to go cheap or just don't do it at all!

But that doesn't mean you have to go to a Mercedes Benz dealership either!

if no local shops can be found i recommend metric motors in ca. ask for mike. he has been very very helpful to me several times and i have only bought a few odds and ends from hiim that nobody else seems to stock.

tom w

leathermang · #20 01-09-2007, 09:50 AM

Quote:

Originally Posted by Chas H

What is the proscription in the FSM against boring the block?
The OP has stated that his engine has 400k mi on it and is concerned that the original pistons may not be servicable. Buying new pistons and new liners seems to me to be wasting money.
And save your pedantic lectures for someone that cares.

You are free to put my name on your ' ignore list' .... that service is available in the software ...

HOWEVER, what I am saying is not only " by the book ( FSM ) " but the only responsible action MONEY WISE.
Where you put " buying new pistons and new liners " together ( your faulty memory of the FSM you long ago ' looked at once' ?) I don't know...
If a person wanted to use the OLD PISTONS.. but new rings ( assumed ) then the way to do that is to pull the sleeves and put new sleeves.... measure those old pistons, bore and hone the new sleeves to the size of the old pistons... and go on with the project...
You are simply WAY OFF and your engine is not what I am concerned with... or whether you read or believe what I am saying.. but whether third party readers get the correct advice.