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Messages - Papster

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Listeroid Engines / Re: JP3 and PRM500
« on: November 01, 2022, 03:10:58 PM »
I fitted the cycle computer today and it worked like a charm (assuming its telling the truth!).  Seems that I am low idling around 275-300rpm, cruising between 375 to 500+.

Also, I have corrected my description from Crunch to Clunk as crunch was a bit misleading. I have found that PRMs do have a reputation for being ‘clunky’ in certain circumstances and I am currently looking into installing a soft-shift valve which purportedly often cures the problem. Expensive though at £4-500.  Beta Marine also offer an accumulator that does the same job - I am currently waiting on a response from them.

Listeroid Engines / Re: JP3 in Narrowboat Smoke and Oiling
« on: October 23, 2022, 05:46:46 PM »
Thanks Cujet,

I have been oiling the valves each morning (per advice) but actually decided to leave it for today’s 4 hr run. A bit early to tell but I think it did run slightly cleaner today.  I suspect I will be burning off the existing residue for a while.  The biggest problem is the unburnt oil that is spitting out.

Listeroid Engines / Re: JP3 and PRM500
« on: October 17, 2022, 09:12:35 PM »
Thanks Steve.

That cycle speedo idea is brilliant.  I will certainly give it a try.  I do have the specs for the PRM and I recently had work done on it so I am confident it is ok.  Trying to match the RPM as a first solution seems to be the best bet. I will order a computer soonest and let you know.

Listeroid Engines / JP3 and PRM500
« on: October 17, 2022, 03:40:45 PM »
I have a PRM500 gearbox attached to my JP3 in a narrowboat. No problems except that I have not found the sweet spot where the gearbox will go into gear without crunching. I have dropped the revs as low as I dare but even at its best, there is still some crunch, especially for reverse.  I have no tachometer so don’t really know how slow I can get it but I do find there is a spot where it just brings the revs back up a little so slowing it down further risks a stall which is not desirable as I am generally using forward/reverse when approaching immovable objects!

I am interested to hear your opinions.  Hopefully I have just missed something obvious or perhaps crunching goes with the territory!



Listeroid Engines / JP3 in Narrowboat Smoke and Oiling
« on: October 17, 2022, 03:32:34 PM »

I am running a jP3 in a narrowboat and am currently on the River Stort.  It has been shallow/weedy and places (deep draught)  so the engine has been loaded up more than normal.  This has been exacerbated by weed regularly wrapping around the prop causing even more drag (and load). The result is more smoke than usual (expected?) but also a lot of oil has been spraying out the vertical exhaust. There was actually pools of oil around the base of the exhaust (on the roof). Is this what you would expect when under heavy load?

I was advised, at purchase, to oil the rockers/valves etc and fill the cylinder head recess prior to each start, which I do. The manual only says to do this after a service/starting first time etc. Is it necessary to do this every time given that each running day is, at most, 4-5 hours and never at full revs?  I sometimes wonder whether I am giving her too much oil although I do keep an eye on the dipstick level.

Any advice/experience welcome.



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