Evaluation of cylinder bores

Box wrench socket, open, 17 mm, 1/2″ square for injection lines

000 589 68 03 00

Socket 27 mm, 1/2″ square

001 589 65 09 00

Socket wrench for threaded ring of prechamber

615 589 00 07 00

PUIIer for prechambers

615 589 00 33 00

Cylinder illuminating lamp

Karl Storz GmbH, 7200 Tuttlingen MotoskopTW(Kaltlicht)

with lens probes 103 26 CW (750 mm) and 103 26 CT (210 mm).

A visual checkup can be made with cylinder head in place by means of a cylinder illuminating lamp. For this purpose, the prechambers must be removed (01-417).

01.8-020/1 F2

When evaluating scored or streaky cylinder walls, it is often difficult for a workshop to decide whether the damage is already extensive and requires removal or repair of the engine, or whether the evidence is harm­less. The following instructions will help in making an expert and correct decision.

With regard to marks on cylinder walls, the first im­portant difference is between “optical streaks” and “seizure streaks”. As a rule, “optical streaks” are about 3 mm wide, they are produced by the piston ring gaps and do not destroy honing structure; “seizure streaks”, however, obliterate honing structure.

With streaks in direction of “land” (in direction of piston pin) shaft streaks or seizures are not possible, since there is no contact between piston skirt and cylinder liner.

01.8-020/2 F2