Re: [MBZ] Rubber parts replacement
After I did a long needed valve adjustment I stumbled on a disconnected ALDA pressure line and fixed it. The cars performance improved drastically, ~20 sec. for 0 - 100 km/hr to under 15 sec. Now I discovered the wastegate pressure line broken off and replaced it, but this didn't make any noticeable difference. I have a heavy foot to get to 60 mph, but rarely exceed this speed. Maybe in that range the wastegate function is not important. On 11/25/05, Marshall Booth [EMAIL PROTECTED] wrote: Hans Neureiter wrote: A while ago a discussion revolved around the 2,000 some rubber parts that eventual need replacement. I came across one I never heard mentioned: The hose that lets the waste gate know when to open. Goes from the compressor outlet to the aneroid capsule on the waste gate actuator, kind of hidden under the turbo. When I changed the motor mounts, I noticed the hose was broken at the wastegate connection. Have no idea how long the waste gate was disabled and how important this may be. Because the hose was rubber, there was a safety backup. It's called the overboost sensor on the intake manifold and when it's activated, fuel enrichment is shut off. This limits the power of the OM617.95 engine to about 70% of it's rated power so that the engine won't be damaged. It's important that primary limit be the wastegate as it provide a smooth/seemless control. When the engine is driven with a serious load at engine speeds much above 2000 rpm, the wastegate remains open most of the time, holding boost pressure to just under 1 bar and the engine is able to deliver it's full rated power. When wastegate remains closed however, the overboost control operates when boost exceeds 1 bar and there there is a sudden ~30% drop in power (from ~112 down to 80 hp in early 617.95 engines or from 120 down to 88 hp in later ones). Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D
Re: [MBZ] Rubber parts replacement
Hans, The rubber hose tells the wastegate to limit the power so with it disconnected you will be at the highest boost possible until the overboost sensor on the Intake Manifold kicks in and cuts the signal to the ALDA. Without that line connected you should actually have more power (up until the overboost kicks in above typical wastegate pressures). Andy On 11/26/05, Hans Neureiter [EMAIL PROTECTED] wrote: After I did a long needed valve adjustment I stumbled on a disconnected ALDA pressure line and fixed it. The cars performance improved drastically, ~20 sec. for 0 - 100 km/hr to under 15 sec. Now I discovered the wastegate pressure line broken off and replaced it, but this didn't make any noticeable difference. I have a heavy foot to get to 60 mph, but rarely exceed this speed. Maybe in that range the wastegate function is not important. On 11/25/05, Marshall Booth [EMAIL PROTECTED] wrote: Hans Neureiter wrote: A while ago a discussion revolved around the 2,000 some rubber parts that eventual need replacement. I came across one I never heard mentioned: The hose that lets the waste gate know when to open. Goes from the compressor outlet to the aneroid capsule on the waste gate actuator, kind of hidden under the turbo. When I changed the motor mounts, I noticed the hose was broken at the wastegate connection. Have no idea how long the waste gate was disabled and how important this may be. Because the hose was rubber, there was a safety backup. It's called the overboost sensor on the intake manifold and when it's activated, fuel enrichment is shut off. This limits the power of the OM617.95 engine to about 70% of it's rated power so that the engine won't be damaged. It's important that primary limit be the wastegate as it provide a smooth/seemless control. When the engine is driven with a serious load at engine speeds much above 2000 rpm, the wastegate remains open most of the time, holding boost pressure to just under 1 bar and the engine is able to deliver it's full rated power. When wastegate remains closed however, the overboost control operates when boost exceeds 1 bar and there there is a sudden ~30% drop in power (from ~112 down to 80 hp in early 617.95 engines or from 120 down to 88 hp in later ones). Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net
Re: [MBZ] Rubber parts replacement
You might never notice, as the fuel will be cut off when you exceed max boost by the overpressure cutout solenoid. Replace the hose, it may extend your turbo bearing life. Peter
Re: [MBZ] Rubber parts replacement
I repaired all the hoses OK. Just didn't notice any changes afterwards. I am just not clear what went on when both, wastegate and ALDA, were disconnected. ALDA disconnected = no fuelenrichment = low boost - no need for the wastegate. ALDA connected, Wastegate inop = fuel enrichment to max boost, than ALDA cuts fuel back. On 11/26/05, Peter Frederick [EMAIL PROTECTED] wrote: You might never notice, as the fuel will be cut off when you exceed max boost by the overpressure cutout solenoid. Replace the hose, it may extend your turbo bearing life. Peter ___ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- Hans Neureiter, Houston, TX '82 300SD, '95 E300D
Re: [MBZ] Rubber parts replacement
Andrew Cunningham wrote: Without that line connected you should actually have more power (up until the overboost kicks in above typical wastegate pressures). In most cases, the ALDA will let the rack go up against the full load stop before it sees 12psi, beyond that the turbo is just making backpressure in the exhaust and heat in the intake without increasing fuel to the engine. Hank wouldn't notice a drop in power when re-enabling the wastegate if the ALDA still allowed full fuel with the wastegate functioning.
Re: [MBZ] Rubber parts replacement
Hans Neureiter wrote: A while ago a discussion revolved around the 2,000 some rubber parts that eventual need replacement. I came across one I never heard mentioned: The hose that lets the waste gate know when to open. Goes from the compressor outlet to the aneroid capsule on the waste gate actuator, kind of hidden under the turbo. When I changed the motor mounts, I noticed the hose was broken at the wastegate connection. Have no idea how long the waste gate was disabled and how important this may be. Because the hose was rubber, there was a safety backup. It's called the overboost sensor on the intake manifold and when it's activated, fuel enrichment is shut off. This limits the power of the OM617.95 engine to about 70% of it's rated power so that the engine won't be damaged. It's important that primary limit be the wastegate as it provide a smooth/seemless control. When the engine is driven with a serious load at engine speeds much above 2000 rpm, the wastegate remains open most of the time, holding boost pressure to just under 1 bar and the engine is able to deliver it's full rated power. When wastegate remains closed however, the overboost control operates when boost exceeds 1 bar and there there is a sudden ~30% drop in power (from ~112 down to 80 hp in early 617.95 engines or from 120 down to 88 hp in later ones). Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi
