Perkins Perama M30

[Bulrush]

Greetings all.

I am new to this forum and I would be very grateful for some help and advice. I have a Perkins Perama M30 3 cylinder engine which is fitted to a PRM120 gearbox. The problem is that the gearbox makes a loud clattering sound in anythng up to 1800 rpm both in and out of gear. I am told that this is due to the low mass of the flywheel which does not smooth out the firing of the cylinders with the result that the whole tramsmission moves in fits and starts and makes its aweful noise. To remedy the situation I am told that the mass of the flywheel needs to be increased. I was wondering if anyone has had experience of this and can please advise me how I can go about achieving this.

If anyone else has experience of this problem and can advise on another solution it would also be appreciated.


Very many thanks

Simon

 

[david_bagshaw]

I suppose the vibration damper plate isnt broken?, or do they all do this.

 

[Latestarter1]

Greetings all.

I am new to this forum and I would be very grateful for some help and advice. I have a Perkins Perama M30 3 cylinder engine which is fitted to a PRM120 gearbox. The problem is that the gearbox makes a loud clattering sound in anythng up to 1800 rpm both in and out of gear. I am told that this is due to the low mass of the flywheel which does not smooth out the firing of the cylinders with the result that the whole tramsmission moves in fits and starts and makes its aweful noise. To remedy the situation I am told that the mass of the flywheel needs to be increased. I was wondering if anyone has had experience of this and can please advise me how I can go about achieving this.

If anyone else has experience of this problem and can advise on another solution it would also be appreciated.


Very many thanks

Simon

Person telling you this is blowing smoke.

Yes you can get torsional compatability issues at IDLE with some modern gearboxes. If you consider that engine idle speed is not truly isochronous as engine speed tends to slow very slightly as engine approaches TDC. You will never pick it up on a digital rev counter but it does happen. The result is that the gearbox teeth start to talk to each other.

This is not the case in the problem you describe as this only happens at idle.

David is on the correct track however his terms are a little out of whack. The Perama M30 does not have a vibration damper on the crank nose. Suspect your drive plate flexible element has failed, it will not be in first flush of youth. You can purchase nex flex plates direct from R&D http://www.randdmarine.com/mdamper.asp

Cheap as chips and easy DIY job.

 

[david_bagshaw]

David is on the correct track however his terms are a little out of whack. The Perama M30 does not have a vibration damper on the crank nose. Suspect your drive plate flexible element has failed, it will not be in first flush of youth. You can purchase nex flex plates direct from R&D http://www.randdmarine.com/mdamper.asp

Cheap as chips and easy DIY job.

yep you are right.....,drive plate flexible element has failed is what I was trying to refer to.