50 Hour Service I got Gongoozled

I did the first 50 hour service today at 54.7 hours.  This required engine oil and filter change and three diesel filters. I havent needed to top up the engine oil in the first 50 hours so it seems its not using any. :-)

This was the water and gunk collected from the 2 pre-filters.

Not actually a great amount so thats pleasing.  The service book says to do it at 125 hours then every 125 hours but I think I will stick with doing it ever 50 hours.  Its easy to do anyway

The alternator belts needed adjusting the lower one more than the upper one.  I run out of time today and have still to do the tappets but the engine sounds pretty quiet, indeed more so after the oil and filter change. The oil was in very good condition just a very light charcol colour.

Engine mountings we checked and found to be tight and a general check of the engine found nothing loose.

I checked and toped up the oil in the generator.   This is using a bit of oil, but it runs a lot more than the engine and a lot faster, 3000rpm where as the engine seldom goes over 1200rpm.

All that done I needed to empty the toilet tank and fill with water so it was time to take the boat out solo.  A quick blast up the river to turn around and then off to the services area.

Avalon on the service point

Mission accomplished!  It takes a little over 2 hours to fill the tank, so I set it filling after doing the pump out which takes 10 minutes. 

I decided to moor on the town moorings instead of going back to the home mooring.  Inspired by my new found confidence I  decided to see if I could moor in between a NB and plastic cruiser a gap of about 70.  As usual this sort of manoeuvre attracts an audience.  A very slow and careful approach saw me in to a round of applause from the on lookers.  So now I have officially been Gongoozled.

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A Kind Of Hush

I wouldnt say our engine is particularly noisy, indeed as its getting a few hours on it it seems to be getting a bit quieter.  We had no soundproofing under the 18mm deck floor.  We have a local firm  

who specialise in acoustic and thermal insulation.  Ive know the owner for many years and contacted him for some advice.  He offered a 43mm laminated foam panel with 10kg man made lead type core wrapped in heat reflective foil as a solution.

The process started a few weeks ago with me making and supplying templates as TAP will make to exact size rather than just buying it in slabs as is the norm from chandlers.

 Starboard floorboard underside

Last week I got a call to say the panels were ready and today I fixed them under the floors.  The backing is self adhesive but I decided to add some mechanical fixing too.

Engine hatch before

Engine hatch after

I did some dB checks with the trusty iPhone db meter yesterday while we were on the move and will do some more tomorrow when we move again.  I have to say though just with the engine on tick over there is a noticeable difference.  Of course the engine is not the only noise source, a fair amount of prop against water is present too so a static test is not really valid.

On another noise note Ive had an annoying metallic buzz at 1050rmp and again at 1900rpm which can be heard in this video.

I think Ive now solved it.  Theres a plate covering the turbo and I think this is the cause of the problem.

I have put it back with a few dollops of high temperature silicone in the hope this will stop the vibration.

RESULTS

First off the vibration has stopped, so thats cured.

I wish I had done some more noise comparison tests at different RPM as the difference on general cruise RPM is measurably better:-

Before

After

But this really isnt the whole story as I later found out.  The sound proofing actually works better the louder the engine gets, so as the RPM and prop noise builds, the sound insulation damps more of it out, so its much much quieter when the RPM is higher and the prop thrashing more.  Now its much quieter when its working harder something I didnt expect.


Another test I never considered measuring was the generator.  The genny is already cocooned but with the new under deck sound insulation the difference is very noticeable.  I will be going back to TAP to see if they can help with quieting then Mikuni CH boiler.


So in conclusion:-  Well worth installing.

 

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