LIMBACH L 1700 Maintenance Instruction

Subject: Check and adjustment of carburetor Zenith 150 CD 3
Affected engines: All engines of the following types:
Note: Position numbers in parenthesis used in the descriptions relate to the drawing of the carburetor.
Checking carburetor diaphragm
1. Unscrew damping piston (1).
2. Unscrew screws (2) and remove top (4).
3. Remove spring (5) and regulating piston (6 - 14).
4. Check diaphragm (8) for porosity resp. fissures by extending. If the diaphragm is porous, deformed or
shows fissures it must be replaced.
Replacing carburetor diaphragm
1. Assembly steps as under „Checking carburetor diaphragm"
2. Unscrew screws (6), remove ring (7) and diaphragm (8).
3. Put the new diaphragm onto the regulating piston; the boss on the diaphragm rim must be well-aligned
with the appropriate notch on the regulating piston.
4. Put on ring (7) and tighten with screws (6).
Assembly of regulating piston
1. Assembly steps as under „Replacing carburetor diaphragm"
2. Put the regulating piston into the carburetor housing; the boss on the diaphragm rim must be well-
aligned with the appropriate notch in the carburetor housing.
3. Put on spring (5), tighten top (4) with screws (2).
4. Fill damper with oil to about 5 mm below upper edge of piston guide. Use only carburetor oil p/n:
170.210.005.
5. Screw in damper piston (1).
Basic adjustment of carburetor
1. Unscrew damper piston (1).
2. Untighten screws (2) and remove top (4).
3. Remove spring (5) and regulating piston (6-14).
4. Turn adjustment screw (11) with a wrench p/n: 803.001.022 until the support of the carburetor float
spindle is even with the lower edge of the regulating piston.
5. Put in the regulating piston into the carburetor housing; the top of the diaphragm must be completely in
mesh with the appropriate sparing at the carburetor housing.
6. Put in spring (5), tighten top (4) with screws (2).
7. Put in guiding sleeve p/n: 803.001.021 into guide of the regulating piston and turn until it engages with
the chamfer of the piston guide.
8. Put the wrench through the guiding sleeve and engage adjustment screw (11).
9. Turn the adjustment screw clockwise according to the amount of revolutions listed in the following
table. Hold up the regulating piston with the guiding sleeve to prevent damage of the diaphragm.
10. Fill in oil to about 5 mm below the upper edge of the piston guide. Use only carburetor oil p/n:
170.210.005.
11. Tighten damper piston (11) with screws.
Bearb.: Stolinski
Gepr. + Freig.:
Maintenance Instruction
L 1700
L 2000
L 2400 EB, EE
Replaces edition from: 13.09.96
Edition: 18.12.02
Page: 1 of 1 Pages
Reg.-Nr.: 041 Datei:
MI10-3.DOC
10.3