I believe most volvos have a raw water pump mounted on the front of the
engine. Driven by a fan belt. Generally that type of pump has a plate on
the back that you take off to replace the impeller. You may have to remove
the pump from the engine to get at the plate.

"Rob" wrote in message
m...
I have a 97 Volvo/Penta 5.7GL, with an SX Cobra Drive. I am looking
for the instructions or diagram to replace the impeller. At idle and
low speeds temp remains at about 140 -160 but once we run it the temp
spikes and returns to normal once we idle it again. I have noticed
that while on the hose with the flush ears not much water is
exhuasting thru the prop????