Kohler COMMAND CH18-745 User Manual download pdf (Page 57)

5A.10

Section 5A

LPG Fuel Systems

Impco (Beam) Regulator (See Figure 5A-20)

LPG vapor enters at point (A), then passes into

primary area (B) at point (28), where pressure is

reduced from up to 250 psi at the tank to 4.5 psi in

area (B). Fuel pressure against diaphragm (2)

overcomes spring (3) and as movement increases,

spring (5) will close lever (6). The primary diaphragm

breather (not shown in drawing) is vented to secondary

chamber so that rupture of this diaphragm would direct

fuel into the carburetor.

Fuel now moves through passage (E), past secondary

valve (25) into secondary area (C). As negative

pressure (vacuum) is created at the carburetor venturi

and is transmitted through the dry-gas hose to

chamber (C) secondary diaphragm (12) is drawn down

and contacts the secondary lever (16). Fuel will flow in

proportion to air velocity through the carburetor venturi,

ensuring an ideal mixture at all engine speeds.

Whenever the engine is operating, the vacuum

diaphragm (10) is down against the floor (H) and the

spring (11) is compressed. The idle and starting

adjustment is made with a tamper-resistant screw (17)

which regulates the whisker wire system (not shown),

opening up the secondary orifice slightly (but only

when the vacuum diaphragm is drawn down). Very

little vacuum is needed to start this vacuum diaphragm

travel: 0.2" Mercury to start and 0.5" Mercury for full

travel. The instant the engine stops rotating, loss of

vacuum in section (D) releases diaphragm (10)

causing bumper (K) to push against secondary lever

(16), overcoming action of whisker wire and ensuring

100% lock off.

This patented Beam design will lock off primary

pressures up to five times in excess of normal and

permits starting without priming or choking.

Figure 5A-20.

9 21

1) 1/8-27 NPT Plug

2) Primary Diaphragm Assembly

3) Primary Spring

4) Expansion Plug

5) Secondary Diaphragm Spring

6) Primary Lever Assembly

7) Fillister Head Screw

8) Primary Pivot Pin

9) Torx Head Screw

10) Vac Lock Diaphragm

Assembly

11) Vac Lock Spring

12) Secondary Diaphragm

13) Pan Head Screw

14) Secondary Lever Spring

15) Secondary Pivot Pin

16) Secondary Lever

Assembly

17) Adjustment Screw

18) Pan Head Screw

19) Expansion Plug

20) Diaphragm Gasket

21) Split Lock Washer

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 217 218

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Kohler COMMAND CH18-745 User Manual Page 57

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