GFB Mach 1 Blow-off Valve (part 1001) - Manual (Page 4)

Maintenance
GFB products are designed and manufactured in a way that, in most circumstances, requires little or no regular maintenance.
Cleaning and/or disassembly are only necessary if the piston does not move smoothly or if there is damage from dirt or other
foreign objects. The following is a list of symptoms that might indicate cleaning is required:
•
The venting sound becomes irregular or noticeably different
•
The piston is covered with a sticky grey film
•
The car begins to stall or idle badly where it didn’t previously
•
Physical damage (vertical score marks) can be seen on the piston surface
To disassemble the Mach 1, use
a 1.5mm hex key to remove the
grub screw at the bottom of the
valve body. Unscrew the base,
taking care as the spring is pre-
loaded with about 5kg of force,
and the valve will want to pop
apart as the base comes free.
Wipe all internal parts clean with a rag. Inspect the piston and bore for visual damage, then slide the piston into the bore dry to
check that it slides smoothly and freely. If any damage is found or the piston does not slide freely, contact GFB for advice.
Otherwise, smear the piston and bore with engine oil and re-assemble.
Accessories available
Base adaptors (screw on in place of existing base):
5020 – 20mm hose base
5025 – 25mm hose base
5030 – 30mm hose base
5035 – 35mm hose/1” pipe mount base (standard supplied base)
5038 – 38mm (1.5”) pipe mount base (compatible with Turbosmart adaptors)
Plumb back outlets (to replace trumpet):
5220 – 20mm
5225 – 25mm
5230 – 30mm (standard outlet supplied)
5233 – 33mm
Hose plugs:
5520 – 20mm
5525 – 25mm
5530 – 30mm (standard supplied plug)
5533 – 33mm
Model-specific flange adaptors:
5101 – MY99-00 WRX/Forester GT
5104 – R33/34 Skyline
5107 – MY03-04 Forester XT
5108 – MY01-07 WRX/STi, MY05-08 Forester XT
5109 – S14 & S15 200SX
This product is intended for racing use only, and it is the owner’s
responsibility to be aware of the legalities of fitting this product in
his or her state/territory regarding noise, emissions and vehicle
modifications. GFB recommends that only qualified motor
engineers fit this product.
Materials and workmanship of this product are covered by a
lifetime warranty. Moving components subject to wear are covered
for a period of one year from the date of purchase. Warranty is
limited only to the repair or replacement of GFB products provided
they are installed and used as intended, and in accordance with all
applicable warnings and limitations. No other warranty is
expressed or implied.
GFB products are engineered for best performance, however
incorrect use or modification of factory systems may cause damage
to or reduce the longevity of the engine or drivetrain components.