Main.TrailIndexPage | Engine | Cylinder

Cylinder

This component is part of Engine.

Definition

Define the component. Include, if known, the german language word for the component, as well as the English or American equivalent. Show a picture, a diagram.

  • Its technical name & common name(s)
  • part # - start year & end year
  • which area it belongs to - engine, transmission, body, injection etc, link back to the relevant section

Function

Describe, in general terms the function of this component. Meaning what is it there for and what role it plays. Describe how it works, the inside mechanism. Use diagrams to explain.

Maintenance

Describe common maintenance procedures, and common faults that may occur. Describe how these may be diagnosed and resolved. Again, include diagrams, photographs and explanations. Where possible, include measures, tolerances, weights etc.

  • Symptoms when it faults
  • How to test if it is faulty - what tools to use
  • How to fix / change
  • Resleeving Cylinders

Link to related components where appropriate.

Old Yahoo content

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Resleeving Cylinders

My engine’s cylinder bores are pitted to a depth of 0.5mm, maybe even 1.0mm. Can these engines be sleeved so that I can use existing pistons? Do you know of any stockists/part numbers/availability if these sleeves are available? Are the pistons a generic part used in a range of Merc motors? What have any of you tech guys out there done to rectify this sort of thing before? Engine number M13098322007202 if this helps.

Dan says: I've sleeved a 250 SL engine but not a 280. Not sure about them - I'll ask and see. The whole process can be more than finding a good used block. Any 280 SE of the same year would work and may cost less. There is an early and late engine which cuts off somewhere on 1970 cars. Aside from the engine number you can't really tell the difference. Engine number matching the car isn't a big deal like it is for Corvettes or Mopars.

Have since been told that M130's can't be 'lined' like others as it was an overbored engine from 230/250 anyway? Was told by Crewe Engines, "U.K.'s leading Merc engine specialist." Sound right?

Dan says: the 230, 250 and 280 engines are all very different from each other although the 230 and 250 heads can be interchanged. It is the blocks that are very different. The 280 block is bored out to pretty much maximum. If having an original block (not engine) is so important the prices paid for cars doesn't reflect this. Nor does any for sale adds. This is more in the mind of the owner than in the pocket book of the buyer - a true indication of real value. So, if you must, get a replacement block. Have the area where the serial no. is stamped machined off and re stamp your numbers in place of it. On factory replacement blocks there is no number. The dealer was suposed to have them stamped in. I've seen engines with nothing there and knew right away that it was a replacement block.

As the cylinders wear they get a taper -bigger at the top and smaller at the bottom. You can go up to about .015" of wear overall or .007 per side. The rings have to expand and contract every time the piston moves. So, they tend to break at high RPM but can handle 3,500 for years. I know this from first hand. Engine wear is about .001" per 10,000 miles on average - some better and some worse. If you have a car with lower compression and over 100,000 miles it's a safe bet that you have cylinder wear. The same wear that will break rings at high RPM.

You can sleeve them with no problems. If it's standard bore you can go up to 83mm pistons which is .040" over. This will clean out even the worst cylinder wear in most cases but not deep gouges in the wall. That will need a sleeve. The piston is always .03mm smaller than the bore in MB cars from this time period. Doesn't matter if it's 80mm or 103mm, it is still the same clearance. This is done by using a steel band which is imbedded into the piston just below the pin hole. This band controls thermal expansion so well that only minimal clearances are required. US cars from the same time period used a basic .001" per inch of piston diameter for clearances. Probably why MB cars are so smooth and quiet at hot idle.
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