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14.6) Cylinder and piston - removal
See Pic. 255 and 256.
NOTE:
1
00290
Pic. 255
9
R
00291
Remove nut U and extraction tool. Remove piston. Coordi-
nate piston pin and piston with the respective cylinder.
14.6.1) Piston checking
Date
Page
2002 01 01
252
Prior to removal, mark cylinders and pistons to ensure correct
coordination at re-assembly. Cylinders are identical, pistons have
offset centres of pin to piston!
Set piston to top dead centre position and make an arrow
Q facing towards gearbox. This arrow faces on all 4
cylinders towards gearbox and serves for correct instal-
lation of the pistons with offset centres.
Withdraw cylinder carefully, support it by hand to avoid
damaging piston and piston rings. After moving circlips
W in the groove to 9 o`clock or 3 o`clock position, remove
piston pin circlips by a specially shaped screwdriver E,
see Chapter 11.4).
Push out piston pin using guide punch, part no. 877 016.
2
If the piston pin is tight, it can be withdrawn with extraction
tool R, part no. 877 090, see Chapter 11.6). Insert puller
spindle T into piston pin Y and screw nut U onto
3
spindle. By turning the spindle clockwise, the piston pin
is pulled from the conrod I into the extraction sleeve O
until the piston P can be removed.
See Pic. 257 and 258.
On engine type 914 F cast light alloy, full skirt pistons are used. The piston
axis is offset by 1 mm (.039 in.).
Remove piston rings using a pair of piston ring pliers. Make absolutely sure
to re-fit rings in their initial position. Check piston rings and ring grooves for
oil carbon residues. The best way to clean piston ring grooves is by using a
piece of a broken ring. Increased amount of residue is to be expected when
using AVGAS 100LL. Remove carbon deposits from piston crown.
Main
914 F
10
6
5
Reference
8
7
Pic. 256
Modification no.
- 4 -
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