Diffuser ring on OMC props

[steviecops]

Hi<br />I recently bought a used OMC prop for my Johnson 55. I went from a 17 pitch to a 15 to increase my rpm. The replacement prop didn't have a diffuser ring fitted, so I tried to take the one off of my old prop to fit it to my new one. The obvious happened and I broke the ring, so I made a repair with araldite and taped the ring in place while the araldite cured.<br /><br />When I took my boat out, about 500 yards from the ramp, the engine suddenly picked up by a couple of hundred rpm for no apparent reason. When I got back in, I discovered that the diffuser ring was missing. I'm assuming that the increase in rpm happened when my repair failed and the ring came off. <br /><br />So, two questions.<br /><br />How do I fit a new diffuser ring without breaking it? And will it hurt to run my engine without a diffuser ring fitted?<br /><br />The engine ran great a the higher rpm.<br /><br />Thanks <br />Steve

 

[G DANE]

Re: Diffuser ring on OMC props

You can easily replace the ring. Reason it broke is that they get brittle over time. You will have noticeable better reverse with the ring on. I never experienced more top end without the ring, tried both.

 

[steviecops]

Re: Diffuser ring on OMC props

Thanks D DANE<br /><br />So apart from reverse, there's no harm in running without one then?<br /><br />Thanks<br />Steve

 

[G DANE]

Re: Diffuser ring on OMC props

None that I know of, I've seen many run for years without them. The stainless propellers have no diffuser ring.

 

[steviecops]

Re: Diffuser ring on OMC props

Thanks G DANE.<br /><br />All the best<br />Steve