RESTORATION PROJECT OF THE STRIP DOWN AND REBUILD OF BN’s 1958 DOWTY JET BOAT

Web by BN-WEBS 2012

© Copyright Old Speed Boats 2012

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Assembling the bearing box into the jet intake unit. What a pleasure to work on something reasonable clean at last. Note the pitting and marking of the alloy, little I can do though. Adjustment of the impellers is a problem as there are no instructions on how to obtain the 20 thou gap required, which is inside the intake housing. The unit will be painted blue on completion. This section is fairly self explanatory otherwise.

Jet housing showing drain holes (above left) & configuration for the seals and bearing (above right)

Before inserting the bearing pot, check that all holes aline. Also as the unit is built to aircraft specification, it has little lead indents to see if the pot has ever been removed before and mine had not. The pot then has to be replaced by turning one bolt hole right or left, but all the seals and bearings must line up inside.

Bearing pot inserted and new gasket applied. Gasket is 0.9mm. Attach ‘thrust cap (right).

Drive shaft inserted (left) drive coupling inserted (right)

Nut attached, tighten, then undo 1 turn and lock (left) Other end with cone and key inserted in shaft.

1st stage impeller attached (left) cutlass bearing bush attached (right)

Activation tube attached (left) 2nd stage impeller attached (right)