A friend of mine has a 1993 29HP Perkins Perama
with a Hurth
On taking her out one day at the end of last season we noticed a marked drop in drive while going ahead. Revs were fine but there was not enough power to make more than a knot
or two. However there was masses of power when going astern.
We have carefully checked the gear
shift cable and the lever it connects to on the gearbox
and can see no problem or difference between forward and astern modes.
The boat is still in the water
but we have checked the prop ( 3 blade
fixed ) and can see no problem there.
At the beginning of last season we did top up the fluid in the gearbox which appeared to be very low, i.e. there was no level showing on the dip stick when we checked it. The manual called for "ATF Type A" but we could not find that so used Castrol ATF Dex II. The engine
and gearbox worked perfectly all summer until " out of the blue" the loss of drive in forward gear
occurred - it did not occur while underway / in use - so far as we can tell it was fine when she was moored up at the end of one trip but then short of power at the start of the next.
Does anybody have any suggestions as to what the problem might be?
A few years ago the boat was being moved by a yard in Scotland
and one of their engineers felt that the clutch
was slipping. The yard drained the transmission
fluid, replaced it with diesel
and then ran the engine
for a brief period, which apparently solved
the slippage problem. Is that maybe worth a try?
Thanks for your help.