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Old 15 October 2004, 07:46   #11
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Country: UK - England
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Boat name: JU-JU
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Quote:
Originally Posted by Dt125
........... Anyone know a quick way of bleeding the tilt rams? ive run the batteries down twice now just moving the leg up + down for ages and it still wont go all the way up on its own??? ..........
Never had a problem with bleeding the tilt rams once I got them working.

I had some remanufactured ones that were not put together correctly and they were doing the strangest things You can check operation by putting an air line on one inlet and if air comes out the other side all is not right. Having said that there is a crash valve in the ram which will blow off at high pressure (canít remember what) so you donít need lots of pressure to find the fault.

I did have a problem with the external hoses, if you donít get the runs right they can pinch. And another thought is have you got sufficient oil in the system stupid question I know but there is not a lot of reserve capacity

Des
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Old 15 October 2004, 15:53   #12
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Country: UK - England
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Hi Des, Yes there's plenty of oil in the reservoir, i tried slackening off one of the low pressure hoses on the end of one of the rams and when you switch the leg to raise it, oil flows out. Should this happen??
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Old 18 October 2004, 08:56   #13
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Quote:
Originally Posted by Dt125
Hi Des, Yes there's plenty of oil in the reservoir, i tried slackening off one of the low pressure hoses on the end of one of the rams and when you switch the leg to raise it, oil flows out. Should this happen??
If the ram isnít moving and oil is coming out then I think you have a problem.
If the ram is moving it is only the oil on the other side of the piston being forced out.
Having said that I had no problems bleeding the system I remembered over the weekend that to start with the leg went up quite slowly and I got a mate to lift it while I operated the switch maybe this is worth trying

Des
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Old 18 October 2004, 13:40   #14
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Des,
Thanks for that, i got someone to help lift it and its been working fine this afternoon, got her in the water and shes running SO much smoother than before, its great! Having said that, shes only coming up to 2000 rpm at WOT where as she used to do 2400. Possibly dirty fuel filters?? I also replaced a section of fuel line with narrower pipe which may not be letting enough fuel through. Have to see how she goes over the next few days, Cheers DT
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Old 18 October 2004, 14:08   #15
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Am i right in thinking that some jet units are transom mounted only rather than half external, half internal?

If so, then converting to such a jet unit would be feasible as it wouldnt interrupt the planing wedge of the hull and would require very little modification to the transom.

Only downside is that the jet couldnt be a Hamilton.
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Old 18 October 2004, 18:14   #16
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Country: UK - England
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The P22 with jet drive built by James Walrock was lying in Extreme Marine's yard, the hydraulic control system had expired. Looked otherwise ok, tubes tatty. Have some pics if anyone wants them.
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Old 19 October 2004, 04:06   #17
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Quote:
Originally Posted by Dt125
............. 2000 rpm at WOT where as she used to do 2400. ........... I also replaced a section of fuel line with narrower pipe which may not be letting enough fuel through............

Not good these boats have a reputation for fuel problems so I would get the right size pipe ASAP.
Assuming filters are ok it is worth air-lining the fuel lines back to the tank because at one time the Navy used a wooden dipstick and the result is that the tanks are often full of little slithers of wood .

Other things to check are that all the fuel fittings are tight especially the ones from the lift pump onwards, these use a neoprene olive and I think they can become loose equally it is difficult to know how tight they should be .
On the pump there is a pressure relief valve which holds pump body pressure at about 10 psi this will often block and is overlooked when servicing. If blocked this will knock 200-300 rpm of the engine but seams to have no other major effect.
This valve sticks out of the side of the pump and has a fuel return pipe on the other end. Des
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Old 19 October 2004, 14:54   #18
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Tried her out again today and she came straight up to 2400rpm no problem. Been playing around all day and not had any problems at all. Could have possibly been an air bubble in the fuel line??? Not sure but all seems sweet now! Not sure what size the prop is but its slightly bigger than the standard 17 3/4 x 21" and im getting 28kts no problem with just me on board, but i think thats stopping her from going above 2400rpm
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Old 19 October 2004, 18:08   #19
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Wilst on the subject of props, my P22 Prop has Michigan 032109 stamped on it,I have tried Michigan Web site and Google search no info, can anyone tell me what pitch it is, the diam is about 19 inches. It gives approx 22 Knots @2000 rpm.

Thanks Roger
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Old 20 October 2004, 08:25   #20
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Roger, I have the same problem with one of my props. Its going to Steel Developements shortly for a repair so I will ask them to measure it, but it sounds like yours is 23 - 25 inches and probably a bit tall. The best prop I have found at the moment is a 16.76 x 21 which allows the engine to reach max revs of 2600.

Pete
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