Check Points

PROBLEM

POSSIBLE CAUSE

SOLUTION

Discharge pump becomes stiff to

Scale deposit build up in pump cylinder (2 or VE2)

With time, depending on salinity and temperature of the sea water, scale deposit will build up in

the discharge pump and hose. The warmer and more salty the water, the faster this deposit will

form. It can be removed by stripping the pump (see section 7.3) and chipping it off or, by soaking it in vinegar to dissolve it. Scale is best removed from the discharge hose by physically bending and "working" the pipe so that the scale is dislodged and falls out. If

it is possible to remove the hose, this task is made much easier.

Oil or grease in the pump

NEVER use oil or grease to lubricate either of the pump cylinders. It will cause the bucket washers (51 or VE51) to expand and eventually seize in the cylinder, if this happens the

bucket washers must be replaced. The best pump lubricant is liquid soap.  When replacing the bucket washers note that they are supplied over size to take up any wear on old cylinders. This

may mean the pump is stiff to operate having

just replaced the bucket washers. To remedy this situation, remove excess material from the

outer circumference - use a file or emery paper.

Flushing

Bucket washer

Replace bucket washer. It may be necessary to

pump

worn

lightly abrade the new washer to get a good

loses

sliding fit as described above. Liquid soap will

priming

act as a suitable lubricant.

Lower valve not

The lower valve (29A or VE29A) - see pages 9 or

seating

17 - is aluminium Bronze and has a ground

correctly

seating. If the seating is damaged, worn or has

debris interfering with it, it will be fairly

clear on dismantling - see pages 45 and 46.

Either clear the debris or re-grind the valve

using grinding paste - replacement of the

complete assembly may be necessary.