Wastegate - Revision history

Foo: Wikipedia link

2008-05-14T13:02:28Z

Wikipedia link

Foo: Category:Components

2008-05-10T18:34:21Z

Category:Components

Al at 14:13, 3 January 2008

2008-01-03T14:13:50Z

Al at 14:11, 3 January 2008

2008-01-03T14:11:22Z

Geoff at 17:01, 31 December 2007

2007-12-31T17:01:27Z

Geoff: /* Releasing a sticky wastegate */

2007-12-31T17:00:48Z

‎Releasing a sticky wastegate

Geoff: /* Porting the Wastegate */

2007-12-31T16:50:23Z

‎Porting the Wastegate

Geoff: /* Wastegate */

2007-12-31T16:49:07Z

‎Wastegate

Geoff: /* Porting the Wastegate */

2007-12-31T16:48:05Z

‎Porting the Wastegate

Geoff: /* Porting the Wastegate */

2007-12-31T16:44:15Z

‎Porting the Wastegate

← Older revision		Revision as of 13:02, 14 May 2008
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	See [[Porting the wastegate]]		See [[Porting the wastegate]]
		+
		+	== External Links==
		+	* [http://en.wikipedia.org/wiki/Wastegate Wikipedia's Wastegate article]

@@ Line 1: / Line 1: @@
-=Wastegate=
+__TOC__
-−
 The wastegate is involved in the release of pressure from the turbo to regulate the level of boost.
@@ Line 8: / Line 7: @@
 * Lack of boost and power (wastegate stuck open).
 * Uneven boost and power delivery (generally sticky).
 * Wheel-smoking levels of boost and power (wastegate stuck shut) usually closely followed by fuel cut-off and minimal power for 30 seconds at the most inopportune moment plus illumination of the CEL light and a code 31 - see [[Check_Engine_Light_Problems|CEL codes]].
@@ Line 25: / Line 22: @@
 [[Category:Wastegate]]
 [[Category:Turbo]]

@@ Line 13: / Line 13: @@
 * Wheel-smoking levels of boost and power (wastegate stuck shut) usually closely followed by fuel cut-off and minimal power for 30 seconds at the most inopportune moment plus illumination of the CEL light and a code 31 - see [[Check_Engine_Light_Problems|CEL codes]].
-See [[Wastegate: Releasing]]
+See [[Releasing a sticky wastegate]]
 ==Porting the Wastegate==
@@ Line 19: / Line 19: @@
 Porting the wastegate involves boring out the wastegate hole so that it is larger and can therefore release more pressure more quickly.  This can be important to prevent overboost when a large bore exhaust has been fitted.
-See [[Wastegate: Porting]]
+See [[Porting the wastegate]]

← Older revision		Revision as of 14:11, 3 January 2008
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	[[Category:HowTo]]		[[Category:HowTo]]
		+	[[Category:Wastegate]]
		+	[[Category:Turbo]]

@@ Line 2: / Line 2: @@
 The wastegate is involved in the release of pressure from the turbo to regulate the level of boost.
 ==Sticky Wastegate==
@@ Line 20: / Line 14: @@
 See [[Wastegate: Releasing]]
 [[Category:HowTo]]

@@ Line 19: / Line 19: @@
 * Wheel-smoking levels of boost and power (wastegate stuck shut) usually closely followed by fuel cut-off and minimal power for 30 seconds at the most inopportune moment plus illumination of the CEL light and a code 31 - see [[Check_Engine_Light_Problems|CEL codes]].
-== Releasing a sticky wastegate ==
+See [[Wastegate: Releasing]]
-−
-−
-The consensus of opinion on the best way of releasing the wastegate is to remove the actuation capsule. The following pictures were taken of a unit which had been removed from the engine - the turbo '''does not''' have to be removed for this operation but it makes for better photographs! The shaft to the wastegate is shown by the purple arrow, the wastegate actuation rod by the red arrow {don't worry about the threaded section, as this is non-standard} and the actuation capsule by the yellow arrow.
-−
-−
-[[Image:WastegateStickingFigure1.jpg||Turbo and wastegate mechanism]]
-−
-−
-This technique simply involves the removal of the 3 bolts (green arrows) that secure the diaphragm bracket to the turbo impeller housing (the shiny aluminium bit).
-−
-−
-[[Image:WastegateStickingFigure2.jpg||Turbo and wastegate mechanism]]
-−
-−
-This then allows you to move the whole diaphragm and rod from side to side (Wiki Wastegate Wiggle), which soon has it running silky smooth. Make sure the wastegate shaft is turned over it's full range as there is often evidence of sticking at the extremes of travel.
-−
-−
-[[Image:WastegateStickingFigure3.jpg||Turbo and wastegate mechanism]]
-−
-−
-There is not a consensus on whether to lubricate the wastegate shaft or not. One strong argument against is that, because of the extreme temperatures involved, most lubricants will degrade rapidly which may cause the wastegate to stick again and may even carbonise which can cause excessive wear. Any expert opinions would be gratefully received. [In the absence of expert opinion you'll have to make do with mine for the time being: CopaSlip type of lubricant is rated to 1500°C which should be adequate - Geoff]
-−
-−
-All that remains is to replace the three bolts; the usual problem is getting the thread on the bottom bolt (nearest the wastegate actuator rod) started. Ideally you need to curl your arm right underneath by snaking it down past the water pump. Failing this, due to fingers like pigs' tits, a 12 year old is ideal for replacing this last bolt.
-−
 [[Category:HowTo]]

@@ Line 7: / Line 7: @@
 Porting the wastegate involves boring out the wastegate hole so that it is larger and can therefore release more pressure more quickly.  This can be important to prevent overboost when a large bore exhaust has been fitted.
-One of the first jobs is to remove the heatshields from around the manifold and pre-cat housing. On S2, Fed, some ROW Elans and a handful of SE's, there is an [[Oxygen (Lambda) sensor]] which can sometimes be difficult to remove even after frequent dousing in penetrating oil, heat and using the correct lambda socket. The top heatshield '''can''' be removed without removing the sensor however. First remove the three retaining bolts and [[media:Turbo_top_heatshield_removal_1.jpg|raise the heatshield as high as it will go]]. Gently raise the RHS of the heatshield and the [[media:Turbo_top_heatshield_removal_2+.jpg|gap will widen]] (shown by the red arrows) as the heatshield bends on the PAS mounting bolt (shown by the blue arrow). Eventually, it should be possible to pop the heatshield [[media:Turbo_top_heatshield_removal_3.jpg|over the top of the sensor]].
+One of the first jobs is to remove the heatshields from around the manifold and pre-cat housing. On S2, Fed, some ROW Elans and a handful of SE's, there is an [[Oxygen (Lambda) sensor]] which can sometimes be difficult to remove even after frequent dousing in penetrating oil, heat and using the correct lambda socket. The top heatshield '''can''' be removed without removing the sensor however. First remove the three retaining bolts and [[media:Turbo_top_heatshield_removal_1.jpg|raise the heatshield as high as it will go]]. Gently raise the RHS of the heatshield and the [[media:Turbo_top_heatshield_removal_2+.jpg|gap will widen]] (shown by the red arrows) as the heatshield bends on the PAS mounting bolt (shown by the blue arrow). Eventually, it should be possible to pop the heatshield [[media:Turbo_top_heatshield_removal_3.jpg|over the top of the sensor]] and the heatshield will spring back to its original shape.
 ==Sticky Wastegate==

← Older revision		Revision as of 16:44, 31 December 2007
Line 6:		Line 6:

	Porting the wastegate involves boring out the wastegate hole so that it is larger and can therefore release more pressure more quickly. This can be important to prevent overboost when a large bore exhaust has been fitted.		Porting the wastegate involves boring out the wastegate hole so that it is larger and can therefore release more pressure more quickly. This can be important to prevent overboost when a large bore exhaust has been fitted.
		+
		+	One of the first jobs is to remove the heatshields from around the manifold and pre-cat housing. On S2, Fed, some ROW Elans and a handful of SE's, there is an [[Oxygen (Lambda) sensor]] which can sometimes be difficult to remove even after frequent dousing in penetrating oil, heat and using the correct lambda socket. The top heatshield '''can''' be removed without removing the sensor however. First remove the three retaining bolts and [[media:Turbo_top_heatshield_removal_1.jpg\|raise the heatshield as high as it will go]]. Gently raise the RHS of the heatshield and the [[media:Turbo_top_heatshield_removal_2+.jpg\|gap will widen]] (shown by the red arrows) as the heatshield bends on the PAS mounting bolt (shown by the blue arrow). Eventually, it should be possible to pop the heatshield [[media:Turbo_top_heatshield_removal_3.jpg\|over the top of the sensor]].

	==Sticky Wastegate==		==Sticky Wastegate==