Porsche 928 Workshop Manual page 151

13
Ermine. Crankshaft. Pistons 928
Engine Type M 28.11112 (928 S)
Repair size Piston dia.
(mm)
Mahle
Cylinder bore
(mm)
Tolerance group
identification
as of 4.82
Standard 96,960 96,965 97,000 0
96,970 96,975 f 0,005 97,010 ZL 0,005 1
96,900 96,985 97,020 2
1 st oversize 97,460 97,465 97,500 0 KD 1
97,470 97,475 f 0,005 97,510 t 0,005 1 KD 1
97,480 97,405 97,520 2 KD 1 a
Engine Type M 28.19/20 (USA)
Repair size
Piston dia. Cylinder bore
Kolbenschmidt
(mm)
Tolerance group
identification
Standard 96,975 97,000 0
96,985 * 0,007 97,010 * 0,005 1
96,995 97,020 2
1 st oversize 97,475 97,500 0 KD 1
97,405 ? 0,007 97,510 * 0,005 1 KD 1
97,495 97,520 2 KD 1
Note
It is recommended that the stocks of the relevant piston tolerance group are checked before machin-
ing the cylinders. If necessary, hone to the piston size available.
In some cases, certain tolerance groups may be in short supply.
13-24 Checking pistons and cylinder bores
Printed in oermrny - XXVII, ,991