Forum Home Forum Home > Technical Help > Engine, Gearbox, Stern Gear, etc
  New Posts New Posts RSS Feed: No thrust - intermittent
  FAQ FAQ  Forum Search   Calendar   Register Register  Login Login

No thrust - intermittent

 Post Reply Post Reply Page  <12
Richard Ritchie View Drop Down
CO32 Members
CO32 Members

Joined: 13 Jul 2009
Location: Winchester
Online Status: Offline
Posts: 69
Post Options Post Options   Quote Richard Ritchie Quote  Post ReplyReply Direct Link To This Post Topic: No thrust - intermittent
    Posted: 18 Jun 2013 at 1:46pm
Badger of Baltimore has a Yanmar 2GM20 driving a two bladed oversize prop: 15x12 inch. (The skeg cut out has been enlarged. 
This gives 6 knots optimistically on a clean bottom and no chop. Guess at 2500 rpm. (I have no rev counter.)
Down to 4.5 knots and reduced revs if a very slimey bottom/prop.
Normally cruise at about 5 knots, at about 2litre/hr of fuel.
Richard Ritchie
Badger of Baltimore
IRL 120
Back to Top
waratah912 View Drop Down
CO32 Members
CO32 Members

Joined: 17 Dec 2010
Location: Lymington
Online Status: Offline
Posts: 98
Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 2013 at 10:04am
For the record, and anyone with a Volvo 2002 with a similar problem.
We had a period where you could engage forward but got no acceleration, engine stayed at idle and would sometimes cut out. This was intermittent, and resulted in some interesting moments negotiating the lock at Island Harbour!
Solution was a £4 spring washer which holds the engine end throttle advance lever in place on the shaft. Previous washer had worn and allowed the arm to wander around and also snag the engine stop which is on the same shaft.
Paul Smith
Contact details available from the members only area
Back to Top
Poppy787 View Drop Down
CO32 Members
CO32 Members

Joined: 20 Oct 2014
Online Status: Offline
Posts: 1
Post Options Post Options   Quote Poppy787 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2014 at 9:46am
Thanks, for this. We too had a couple of incidents. One of the Suffolk coast, wind died engine on and no response from the engine, head into engine box to make sure all cables were secure suddenly forward drive no more problems for the rest of the trip. The second incident was more serious going astern in the marina I engaged forward drive to take the way off the boat; again no response from the engine result collision with another craft damage to both boats and a broken wrist. Several engineers inspected the drive train on Poppy and no one could repeat the symptoms, their suggestion the gear box was sticking; although this failed to explain why the engine sometimes remained at idol when in forward gear. Given the engine and gear box are, as far as we know, are the original Volvo Penta 2002 fitted in 1985 it was decided to replace both engine and gearbox. It has proved to be a very expensive spring washer, perhaps the potential for a serious accident to be caused by this problem should encourage anyone with an elderly Penta to check said washer. 
Back to Top
 Post Reply Post Reply Page  <12

Forum Jump Forum Permissions View Drop Down