Re: [Amel Yacht Owners] Volvo Turbos

ianjenkins1946 <>

Dear Joel, Thanks for your advice. That's good to know, because they don't put these things in the Volvo manuals.Thanks also for the tip on the cam belt.By the time we have done 1000 hours we expect to be in Southern Chile--not a Volvo agent in sight there, but if it's of any comfort to anyone else , Volvo do a workshop manual in Spanish and if I find a good mechanic down there I'll post the news as I'm sure everyone will be in a rush to join's only about 3,000 miles up wind and Humbolt current from our present berth in Ecuador...
All the best, Ian

From: "Joel F. Potter" <>
To: <>
Subject: RE: [Amel Yacht Owners] Volvo Turbos
Date: Sun, 27 Jul 2003 02:29:08 -0400

Hello Ian,

Joel Potter here. The turbo boost pop-off valve really needs A LOT of
requested power to function. To check:

1. Go about 3-4 KTS in reverse
2. Gently go to neutral, then forward to idle speed.
3. Wait 3 seconds then wide open throttle in forward. WIDE OPEN.

You will see the rod move ever so briefly. The engine is governed and you
will never get into the boost limit in cruise power conditions. Only when
asking for more than you should, like at avoiding a crash. Hope this helps.

All the best,
Joel F. Potter, Hull #400

P.S. Change your cam belt every 1000 hours. Trust me, this is important.
-----Original Message-----
From: Ian & Judy Jenkins []
Sent: Wednesday, July 23, 2003 1:36 PM
Subject: [Amel Yacht Owners] Volvo Turbos

I have SM 302 with the Volvo/Perkins TMD22p. No complaints after 800
other than replacing the key switch and the engine hour meter and rev
counter, both at crazy Volvo prices.Power output is fine and I take care
open up the revs every few hours to ensure the Turbo is properly
When the revs are high and the turbo is really being used there is a
pressure control valve that opens up if the turbo pressure gets too
I understand it the rod attached to this valve moves back against the
resistance of a spring.I have been advised to move this rod back manually
from time to time ( with engine switched off) to ensure that it is free
moving and it has always been free when I have moved it.
However, when I use full revs there is no discernible movement on this rod
possibly 1/2 mm but it's difficult to guage when the engine is flat
has been suggested to me that as Amel govern the output to 60hp the turbo
pressure doesnt reach the point where the valve opens.( this wouldn't
prevent the turbo from working ok as mine seems to be)
Has anyone any experience to suggest that the rod should or should not be
seen to move at full revs, and if it does move is this a momentary and
occasional movement or should the the valve be seen to stay open above
certain revs?
Ian Jenkins

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