Silencer Assembly (09.01); Variable Flow Silencer Assembly - Aston Martin V8 Vantage Workshop Manual

Exhaust (09.00)

Silencer Assembly (09.01)

Variable Flow Silencer Assembly

The rear silencer assembly has a variable flow path controlled by two bypass valves.
The system is intended to enhance top end performance in motor sport applications and will not operate in most normal
driving conditions.
By directing exhaust gasses through a modified path at high vehicle speeds, exhaust back pressure is reduced and top end
performance is enhanced.
As engine speed increase from idle, the bypass valve is open until the engine speed is 1500 rpm.
From 1500 rpm to 3000 rpm, the valve is closed
Above 3000 rpm the bypass valves state is load dependent (fully open at higher loads).
Maintenance
Silencer and Bypass Valve Assembly-
Remove for Access/Refit
Repair Operation Time (ROT)
Item
Silencer and Bypass Valve Assembly-
Remove for Access/Refit
Removal
1. Raise vehicle on ramp.
2. Remove rear undertray (see Workshop Manual
procedure 01.02.PB Undertray - Rear - Renew).
3. Remove Allen bolts (x4), bumper diffuser to mounting
brackets. Remove diffuser, collect securing brackets.
4. Disconnect both by-pass valve vacuum lines.
5. Remove bolts (x4), rear exhaust pipes to silencer. Collect
springs from bolts.
6. Remove bolts (x4), securing LH and RH silencer rear
hanger brackets to body.
7. Remove bolts (x4), silencer front mountings to subframe.
8. Position suitable lifter to support weight of silencer.
With assistance, remove silencer.
9. Remove both rear rubber mountings and hanger
brackets from silencer.
October 2005
Installation
1. Clean muffler and mating faces on rear pipes.
2. Position silencer on lifter. Install silencer, position rear
hangers, install and torque tighten bolts (x4).
3. Position front mountings to subframe, install and torque
tighten bolts (x4).
4. Align silencer to rear pipes, install springs (x4), install
Code
and torque tighten bolts (x4).
09.00.KA
5. Check silencer to rear pipes for correct alignment and
clearances.
6. Connect lines to both by-pass vacuum valves.
7. Position mounting brackets, install rear bumper diffuser.
Install and tighten Allen bolts.
8. Install rear undertray (see Workshop Manual procedure
01.02.PB Undertray - Rear - Renew).
9. Lower vehicle on ramp.
Silencer and Bypass Valve Assembly-
Renew
Repair Operation Time (ROT)
Item
Silencer and Bypass Valve Assembly-
Renew
Removal
1. Raise vehicle on ramp.
2. Remove rear undertray (see Workshop Manual
procedure 01.02.PB Undertray - Rear - Renew).
Workshop Manual

Silencer Assembly (09.01)

Exhaust (09.00)
Code
09.00.KB
9-1-3