Technical data

Section 04 ENGINE

Sub-Section 02 (TOP END)

040-02-17

Boring Precaution

In its stock configuration the RAVE valve guillotine

has a minimum of 0.5 mm (.020 in) clearance to

the cylinder bore measured at the center line of

the cylinder. This is the minimum production

clearance.

There is only a first oversize piston available for

the 787 engine. That piston is 0.25 mm (.010 in)

larger in diameter than the stock piston. When the

oversize is installed, the guillotine will have a min-

imum clearance of 0.375 mm (.015 in) with the cyl-

inder bore. This is the minimum operating

clearance the guillotine should be used with.

Clearance less than 0.375 mm (.015 in) will require

reworking of the guillotine to achieve the proper

clearance and radius.

Disassembly

19,20, Spring and Cover

Remove the cover of the valve by releasing the

spring.

WARNING : Firmly hold cover to valve

base. The spring inside the valve is apply-

ing a pressure against the cover.

1. Spring

21, Allen Screw

Loosen Allen screws and remove RAVE valve.

1. Allen screws

22,23,24, Valve Piston, Bellow and

Sliding Valve

Remove bellow from valve piston.

Unscrew valve piston from sliding valve.

NOTE : Hold the sliding valve to prevent it

from turning.

1. Unscrew piston

2. Hold sliding valve

;

POWER

RPM

A18C02A

F01D8IA

F01D8MA