Hi all, first time poster.
I've a late 80's 40hp Classic with a serial number between C159200 - C221499.
When idling it has a good strong flow of water out the telltale outlet. However, from anywhere beyond 1/4 throttle up to full throttle the water flow begins to waver, then disappear and then within seconds it begins to steam and hiss. Bringing it right back to idle sees the resumption of a good strong water flow out the telltale outlet within seconds.
Now, when it first happened a few years back I replaced the impeller, and it did it again. I then thought bugger it, and left it in the shed for a few years. I dusted it off last weekend and the same thing was still happening. So, I'm going to try a fresh impeller again, but is there anything else I should be considering?
The confusing thing is that at low revs it pumps well, but at high revs, its almost like its being starved of water.
Any advice?
DMC73
I've a late 80's 40hp Classic with a serial number between C159200 - C221499.
When idling it has a good strong flow of water out the telltale outlet. However, from anywhere beyond 1/4 throttle up to full throttle the water flow begins to waver, then disappear and then within seconds it begins to steam and hiss. Bringing it right back to idle sees the resumption of a good strong water flow out the telltale outlet within seconds.
Now, when it first happened a few years back I replaced the impeller, and it did it again. I then thought bugger it, and left it in the shed for a few years. I dusted it off last weekend and the same thing was still happening. So, I'm going to try a fresh impeller again, but is there anything else I should be considering?
The confusing thing is that at low revs it pumps well, but at high revs, its almost like its being starved of water.
Any advice?
DMC73