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I have uploaded some pictures of my steering box in the gallery, it would appear not to be the Jaguar type.
There is a rubber seal (worn) around the horizontal shaft, some bolts holding a plate around that shaft and a "lid" held on by bolts. There is also a screw set in the "lid" that seems to have no effect when tightened or loosened, I suspect it may just be a filler?
The large nut underneath that connects the vertical drive from the box to the long shaft down to the engine compartment was loose which I have tightened but there is still play up & down/forward & back (1 or 2 mm) on the horizontal shaft that holds the wheel.
I hope to live with it now until the end of the season but any suggestions as to potential causes and the contents of the steering box would be gratefully received before I start dismantling it.
SeaDog Name (if owner or crew) Salia
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Philip Ellis
Aug 9, 2010 - 10:10AM
Re: Steering box - identification
Mark,
I have uploaded three photos of recently refurbished steering box for your reference.
I have replaced the seals as it was leaking gear oil althouh the front seal still does leak slightly probably as the shaft finish was less than perfect but its ok.The box is easy to strip down and inspect and if no serious corrosion is present it is possible to restore although some degree of enginneering capability will be required.
The worm wears the most in the centre where all the work is and some more play will be evident there than at the extent of travel.
I too drew a blank with the jag connection. My boat No is 35.
Some general info on "Cam and Peg Steering Gearbox
This type of steering box incorporates, in place of the conventional screw, a cylindrical shaft, supported between two angular contact ball bearings (Fig. 27.57).(See Gallery)The shaft carries a deep spiral groove, usually with a variable pitch, on its surface between the bearings. The groove has a tapered profile, which narrows towards the bottom. An integral rocker arm and shaft is placed half-way along the cam. At the free end of the rocker arm a conical peg is fitted which engages the groove. When the steering wheel and shaft rotate the camshaft, one side of the spiral groove screws the peg axially forward or backward, depending upon the direction of turning of the cam. This forces the rocker arm to pivot about its shaft axis and as a result a similar angular motion is transferred to the drop arm, which is attached to the shaft's outer end.
The spiral pitch is provided with the minimum pitch in the mid-position to increase the mechanical advantage of the cam and peg device. The progressively increased pitch towards either end of the cam provides more direct steering response using increased steering effort as the steering approaches full lock. Preload of the ball races supporting the cam is adjusted by changing the thickness of shim between the end plate and housing. Spring loaded oil seals are used at both the drop arm end of the rocker shaft as well as at the input end of the camshaft.
In low efficiency cam and peg steering boxes the peg is pressed directly into a hole drilled in the rocker arm.
A rocker shaft end play adjustment screw is made to contact a ground portion of the rocker shaft upper face to obtain the correct depth of peg to cam groove engagement. The rocker shaft rotates in a bronze plain bearing at the drop arm end and directly against the bearing bore at the cam end."
Regards
Philip
SeaDog Name (if owner or crew) Glyfada
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John Lansdell
Aug 9, 2010 - 8:11PM
Re: Steering box - identification
Twotails is No 21. The steering box is identical to that shown in Picture 23, your No 4.
On the Stbd side of the box between two bolt heads is a circular (cover?, not on mine). Below that is the head of a vertical shaft with a screwdriver slot in it, locked by a relatively thin nut. That is the adjustment. Check for any play in the vertical couplings at top and bottom of the shaft. Also check that the bottom bearing is securely attached to the bulkhead.
SeaDog Name (if owner or crew) Twotails
Eric Richardson
Aug 11, 2010 - 3:48PM
Re: Steering box - identification
Hi Mark
It is to long since I stripped the steering box down on Taliesin to remember the details, but it was definately a marine box and not from a Jaguar. The track rod ends on the drag link however could well have been Jaguar as lots of cars used the same track rod ends.
The new seals I fitted still leaked due to wear on the shaft. I solved that problem by using what we used to call solidified oil. That was a very thin type of grease which would flow and lubricate very well, it's high viscosity prevented it from running out down the shaft.
Hope that helps. Eric
Mark
Aug 13, 2010 - 10:34PM
Re: Steering box - identification
Thanks all - I feel a winter job coming on!
SeaDog Name (if owner or crew) Salia
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