|Posted on Monday, August 25, 2003 - 04:09 pm: ||
I have a boat wich is equipped with a P55 engine.
Up until last week I never had any problems with it. The following thing happened:
The engine is stuck in reverse gear (Astern) and by no means I can get it back in neutral or forward. It feels like something is jammed inside and blocking it.
We looked at drawings, I have the original booklet, but we couldn't find the problem.
Is there anyone on the board who might have a clue what's the matter and have (a) solution(s). Any help is appreciated very much.
|Posted on Monday, August 25, 2003 - 04:14 pm: ||
Did it suffer from oil lack or seawater getting in?
From memory, the reverse gear actuation is by cones which are drawn into contact by the gear lever. The cones have a very slightly different taper to enable graduat takeup. I guess it is easy for them to get bonded together by corrosion.
The booklet has instructions on dismantling of the gearbox with the cautionary -Do this only if really necessary- perhaps it is necessary for you to get it in pieces.
That is probably a better option than getting brutal.
|Posted on Monday, August 25, 2003 - 07:51 pm: ||
Callisto..........before you start taking the gearbox out or even think about taking it to pieces try the following......engaging gear at high speed can cause the cone clutch to ''wring '' up. First try swinging the gear lever hard into opposite gear. If this fails use a wooden block and hammer against the shaft coupling,tapping it aft to free a cone stuck in forward gear and vice versa.
good luck ...
|Posted on Tuesday, August 26, 2003 - 05:55 am: ||
Based on the information in a Stuart Turner publication called Stuart Notes (No. 17, Sept 1958)the problem is called "stiction".
As Peter relates it's when the surfaces of the forward cone and the clutch body (gearbox casing) are too perfect with the result that at some time the engine will jam in gear and cannot be withdrawn without undue force to sepratae them.
In most cases, once apart the condition can be cured by adding Oil-dag or Redex. However, in limited instances, the cure may not be complete and a simple modification is necessary.
This involves reducing the length of the engaging surfaces using a lathe. Basically, it involves cutting a parallel (or undercut) face into the clutch body thus reducing the face that meets the forward cone - down to 9/16 inch (parallel face cut) on the gearboxes with a horizontal or "tram" handle gear change lever and down to 5/8 inch (an undercut) on the gearboxes with the vertical gearchange levers.
If you want more info I can post a published drawing showing specs on how the machining is to be done.
|Posted on Tuesday, August 26, 2003 - 12:42 pm: ||
Thank you all for the info.
But reading your answers I get the feeling that I misled you by giving false, well not quite right, information. An update:
As you know the gear-handle can turn 180 degrees from forward to backward, with the middle position as neutral gear. My gear is in backwards and I can turn the handle almost to the middle. But not yet all the way to neutral. As you turn the handle you can feel the engine loosen grip, but the last few centimeters fail.
We tried to get the engine into neutral at different ways:from pulling gently to give it quite a blow. I could try harder, but then i'm afraid i might break something; which I do not want to offcousre.
I hope this will shine a different light on my problem.
|Posted on Wednesday, August 27, 2003 - 08:36 am: ||
OK Callisto...........could it be that the adjustment that centers the cones is out . On top of the gear box there is an adjustment ,a brass piece with two flats on it . It has a locking screw on top . This is used to center the throwout for the cones . But if you cannot disengage the cone then ithink that a piece of wood and a big hammer are the answer . If you hit the steel flange you will be fairly safe and not break any thing . You should be able to tell by the sound of the blow if you are in danger of damaging some thing . All you are trying to do is knock the tapered cone out
|Posted on Wednesday, August 27, 2003 - 05:54 pm: ||
Wow! Some good stuff going down here.
Stuart fanciers of the world unite! All those nasty things people said about their ST engines before replacing with clunky diesels late last century may yet be avenged.
The thing about them is that they were grossly over-engineered and bomb and idiot proof.
Callisto, I hope you will tell us what it turned out to be.
PS My old steamboat had a Stuart Turner compound steam engine, and my new one has a boiler designed by the old Henley-on-Thames draftsmen. I hope to get another compound for this boat too.
|Posted on Monday, September 08, 2003 - 12:04 pm: ||
We made it !!
It is working again, and all it needed was a gently tap on the flange.
This is how we did it: after my first posts about two weeks ago we filled the gearbox with oil. We let that soak for a while and last weekend we went back to the boat to see if we could fix the problem. Having read the posts of Peter and Tim, thanxalot guys, we were equipped with a block of wood and a hammer. On the boat we had a little debate about how to start. First I tried to force the gear handle manually into neutral. My father sais that he saw the axis moving a little and supposed "it has to go back into the gearbox, maybe you can hammer it back in, carefully". As I was about to perform that trick i knocked very gently with the hammer to the flange and all of a sudden the gear was loose. I pulled the handle back and forth a few times and we let the engine run so the oil gets everywhere. Now it's no problem anymore and as good as it was before.
Karst Hoekstra "Callisto"
|Posted on Tuesday, September 09, 2003 - 08:36 am: ||
Glad to hear of your success .
Post Number: 2
|Posted on Thursday, July 29, 2004 - 08:41 pm: ||
hi i have a p55 like to no what fuel mix to use an plug lps its runing
thank you grah
Post Number: 106
|Posted on Friday, July 30, 2004 - 08:15 am: ||
The P5/P55 Manual relates the following:
Fuel mix is one third pint of oil to two gallons of petrol or 20cc of oil to 1 litre of petrol.
I presume your engine takes an 14mm plug - if so use Champion L10, Lodge C.N. or KLG F.50
Post Number: 2
|Posted on Wednesday, July 13, 2005 - 09:36 am: ||
Does any one have a manual for a Stuart Turner p55?
I have recently purchaced a second hand boat with a p55. The engine seems to be working but i have problems with the gearbox. The forward and reverse gears are slipping. I don't have an engine manual.Any information would be appreciated.