Volvo penta TAMD 22 help again please.

[Timsuttle]

After reconnecting the turbo wastegate control system. The throttle is very unresponsive. In neutral it is fine picking up really quick and revving to 5000 revs but when in gear pushing the throttle forward it take ages to pick up and only revs to 3300 revs.
thanks Tim.

 

[tillergirl]

Tim, nobody has responded for a while so although I don't know about that engine I would say 'Don't rev it to 5000!' Revving in neutral tells very little but at 5000 for a marine diesel, you are over-revving it - severely. She should peak revs in gear to 2600 to 3000 revs according to the specification. I think you need some professional help.

 

[Timsuttle]

Tim, nobody has responded for a while so although I don't know about that engine I would say 'Don't rev it to 5000!' Revving in neutral tells very little but at 5000 for a marine diesel, you are over-revving it - severely. She should peak revs in gear to 2600 to 3000 revs according to the specification. I think you need some professional help.

Thank you.

 

[tillergirl]

Suggest Volvopaul. He is a professional and uses the Motor Boat forum at lot and is well regarded. Send him a PM.

 

[Tranona]

The test is how it performs under load. If the boat is in the water and firmly tied up, put it into gear and see what happens, If it is still slow to respond there is something wrong. It should pick up cleanly and you should be able to reach near 4000rpm - not the maximum as the boat is not moving. Poor response can be because of fuel or air problems or with the turbo. Judging by the state of the turbo in your earlier photos and the fact that somebody had disconnected the wastegate I would suggest that the turbo and/or the wastegate need attention.

 

[scottie]

Ages you mean years ?

Revving in neutral never seem right to my ears but seems very macho to some but does not have much mechanical benefit

 

[Bobc]

After reconnecting the turbo wastegate control system. The throttle is very unresponsive. In neutral it is fine picking up really quick and revving to 5000 revs but when in gear pushing the throttle forward it take ages to pick up and only revs to 3300 revs.
thanks Tim.

What did it do before? I assume it revved more than that? That engine goes to 4,600rpm.

If so, I suspect that the wastegate is starting to open (which it wouldn't have been doing before) and letting some of the pressure escape. This is what it is for and how it is designed to work. It stops the intake side becoming over-pressurised and blowing up.

It may be that it was disconnected by someone before in an attempt to boost the pressure and there was another problem or air escaping from the system somewhere.

I would suggest that you rev it to 3000rpm in gear, and feel/listen around all the aftercooler joints to see if pressurised air is leaking out. My aftercooler had a hole in it, where it had corroded at the front lower inside corner, allowing air to escape.

I reckon who ever removed the link, did it for a reason, and more than likely to hide another problem.

Best of luck.

 

[Timsuttle]

Ages you mean years ?

Revving in neutral never seem right to my ears but seems very macho to some but does not have much mechanical benefit

No it t

What did it do before? I assume it revved more than that? That engine goes to 4,600rpm.

If so, I suspect that the wastegate is starting to open (which it wouldn't have been doing before) and letting some of the pressure escape. This is what it is for and how it is designed to work. It stops the intake side becoming over-pressurised and blowing up.

It may be that it was disconnected by someone before in an attempt to boost the pressure and there was another problem or air escaping from the system somewhere.

I would suggest that you rev it to 3000rpm in gear, and feel/listen around all the aftercooler joints to see if pressurised air is leaking out. My aftercooler had a hole in it, where it had corroded at the front lower inside corner, allowing air to escape.

I reckon who ever removed the link, did it for a reason, and more than likely to hide another problem.

Best of luck.

thank you

 

[Bobc]

No it t

thank you

Also, is the engine producing any white/grey smoke? If it is, this would imply that the fuel isn't being burnt properly due to not enough air pressure in the inlet side.

If you look in the manual, there is a critical measurement for that bar you connected to ensure that the wastegate starts to open at the correct rpm. Check this too, but I suspect that'll be right and won't have been messed with.

 

[Timsuttle]

Also, is the engine producing any white/grey smoke? If it is, this would imply that the fuel isn't being burnt properly due to not enough air pressure in the inlet side.

If you look in the manual, there is a critical measurement for that bar you connected to ensure that the wastegate starts to open at the correct rpm. Check this too, but I suspect that'll be right and won't have been messed with.

Thank you Bob we have moved the bar a bit so we could reconnect it and it’s not back to where it was I can tell by the paint marks. There is now a shiny bit after reconnecting and the is some white smoke.

 

[Bobc]

Thank you Bob we have moved the bar a bit so we could reconnect it and it’s not back to where it was I can tell by the paint marks. There is now a shiny bit after reconnecting and the is some white smoke.

View attachment 108794View attachment 108795

Ok, adjust the bar back to where it was. What you have effectively done is to start opening the wastegate before it should be open.

I'm afraid I don't have the manual any more to tell you what the measurement is.

 

[Timsuttle]

Ok, adjust the bar back to where it was. What you have effectively done is to start opening the wastegate before it should be open.

I'm afraid I don't have the manual any more to tell you what the measurement is.

Thank you Bob I will do and report back.