603.97 cylinder liners - PeachParts Mercedes-Benz Forum

sixto · #1 08-30-2006, 12:54 AM

I've heard that 603.97 cylinder liners cannot be replaced. What are the cylinder liners that ************************ sells for the 603.97? Cost of pistons is prohibitive and I'm sure rods too, but the liners are about $50 each.

Thanks,
Sixto
93 300SD

mbdoc · #2 08-30-2006, 08:16 AM

All MBUSA car diesel engines from 1968 can have the cylinders re-lined..even the dreaded OM603.97 series.

t walgamuth · #3 08-30-2006, 08:47 AM

there has been discussion about the 3.5 here which suggests it cannot be sleeved.

are you saying that it isnt from the factory but sleeves can be added?

tom w

TheDon · #4 08-30-2006, 10:58 AM

maybe those nutty mercedes engineers noticed on the om603 that if they left the sleeves out they would have more displacement.

DslBnz · #5 08-30-2006, 05:31 PM

What liners?

Three fissures occured starting from the outer bowl of the piston crown (originating from the cylinder wall).

sixto · #6 08-30-2006, 05:59 PM

FSM talks about pressing out the old sleeves and machining new sleeves. EPC has them for $500 each, pp.com has them for $50. I don't know how sleeves deal with the coolant slot.

Edit: I misread my notes from the EPC. I see list closer to $80.

Sixto
93 300SD

Brian Carlton · #7 08-30-2006, 06:05 PM

Quote:

Originally Posted by sixto

FSM talks about pressing out the old sleeves and machining new sleeves. EPS has them for $500 each, pp.com has them for $50. I don't know how sleeves deal with the coolant slot.

Sixto
93 300SD

Is that a coolant passage between the cylinders........or just a relief to prevent the start of a crack?

t walgamuth · #8 08-31-2006, 12:25 AM

that little barbell slot between the cylinders is a relief slot to allow expansion without distorting the cylinders. one of the nicest block details i have ever seen.

and i have never seen them on anything but a benz.

IF there are sleeves, they would be clear of the slot by virtue of the fact that they would be very thin.

tom w

TwitchKitty · #9 08-31-2006, 12:03 PM

Quote:

Originally Posted by t walgamuth

that little barbell slot between the cylinders is a relief slot to allow expansion without distorting the cylinders. one of the nicest block details i have ever seen.

and i have never seen them on anything but a benz.

IF there are sleeves, they would be clear of the slot by virtue of the fact that they would be very thin.

tom w

Seems like I have seen holes like that but without the slots on an SBC. 400 maybe? May have been a modification on a racing motor.

I agree that it is a nice detail, but I have to wonder about the movement there and how it affects the head and gasket.

gsxr · #10 08-31-2006, 01:28 PM

The sleeves are very thin... maybe a few mm? I've never seen one out of the block, but if you clean the block surface very well (I use a wire brush on the end of a drill), you can see the difference between the block and the sleeve. The sleeves are designed to be pressed in, then machined to spec. The EPC shows part number 601-011-03-10, list price of $50 each, so you should be able to get a set for under $300.

I too recall hearing something about not being able to re-sleeve the 3.5L, but I honestly don't recall any details as to why.

mbdoc · #11 08-31-2006, 04:36 PM

Take a look at this....sounds like spam doesn't it?

t walgamuth · #12 08-31-2006, 06:51 PM

now that sounds like it doesnt have them from the factory but you can bore and add them. is the second engine number the 3.5 engine?

yes, they are pretty thin. i would estimate they are 3/32 thick. they have a thicker part at the top to keep them from going too deep. i think then you deck it to remove twist in the block and make the deck parallel to the crank line, then bore so the bores are perfectly perpendicular to the crank line and then hone to a perfect fit on the pistons. follow the fsm exactly on clearance.

tom w

BenzDiesel · #13 09-05-2006, 08:03 AM

In your picture, what do you think caused the fissures on the piston to start? Isn't that a 350 OM603 engine? If so, could you detect which rod was bent by checking to see which piston didn't come all the way up to the deck? Thanks

BenzDiesel

t walgamuth · #14 09-05-2006, 09:00 AM

yes, theoretically but the amount of shortened stroke will be pretty hard to measure without taking the head off. there isnt any easy way to get a precise measurement.

tom w

riethoven · #15 09-05-2006, 09:16 AM

I know on the 603.960 engines, the FSM shows pressing out the existing liner so a new one can be pressed in. But I am now in the process of cleaning up the deck surface on the block and I can't see the liners. Maybe there are no liners unless they are retrofitted. I just read the section in the FSM about removing and replacing liners and it did not say anything about boring the block before the liner could be installed.

But the FSM does mention that not all engines have liners.