Re: [Amel Yacht Owners] Volvo Turbos

ianjenkins1946 <>

Thanks, Jay.As I write I am actually in England, returning to Ecuador in a few weeks.I have bought my spare cam belt and my local Volvo agent here reckons he can teach me to swap it myself.Your experience makes sure I will pay very close attention to what he says! Ian Jenkins

From: Jay Jones <>
Subject: RE: [Amel Yacht Owners] Volvo Turbos
Date: Tue, 29 Jul 2003 05:13:39 -0700 (PDT)

Mr Jenkins
I can not add enough weight to what Joel said about
the Cam Belt, so let me relate a story.
We run 6 generators with this type of motor, all of
them failed from 1050 hours-1370 hours due to cam belt
failure(change of service contract long story). the
least damage done was one generator simply bent all
the valve stems so we got away with simply replacing
all the valves. One engine was a total loss and 2
required complete rebuilds, the other 2 were somewhere
in between.
Admittedly these engines have been runnining against
the stops for their whole lives because they were
right sized for a smaller project however do you
really want a cam belt failure when you are
desperately seeking all the revs you can get.
It could be worth your while to throw away the 300
hours or so and replace the belt before you go, if
there is the slightest possibility you will exceed the
1000 hours.
By the way now that we know about the cam belt
sensitivity we have not had another problem with these
motors and they are going on 7 years old.

Jay P Jones
--- Ian & Judy Jenkins <>
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
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

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
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
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
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
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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