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Hylas Discussion / Re: Transmission/Engine Issues - Kanzaki/Yanmar
« Last post by Andrew on September 22, 2022, 04:49:54 AM »
Hi Jon,
i had a similar issue where there was vibration and revs would not increase after gear change - i believe there can be an issue with maxprop and cone clutch of the km4a gearbox setting up a feedback loop of clutch grab, prop opens, bounces off stop, clutch grabs again and repeats, setting off a similar cycle in the injector pump governor.  if that is the cause, you could try borrowing and fitting a fixed blade prop - I carry one as a spare) - if that solves it you could try a different type of folding or feathering prop,
hope that helps,
Andrew Eaglen,
Hylas 51
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Hylas Discussion / Re: Transmission/Engine Issues - Kanzaki/Yanmar
« Last post by Andrew on September 22, 2022, 04:43:48 AM »
Hi Jon,
can
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Hylas Discussion / Re: Transmission/Engine Issues - Kanzaki/Yanmar
« Last post by Matilda on September 22, 2022, 02:39:30 AM »
Hi Jon,
I have to agree with JT- check the injectors.
I don't have any info on your transmission but I recently had issues with my 4JH TE not developing power. Water got into one of the tanks (I think through a leaky deck fill) and this destroyed the injector nozzles. The mechanic bench tested the injectors and the spray pattern was way off. New nozzles and I'm back to the 2600 cruising rpm.

What was the reason for the original rebuild? The numbers looked good and you had no smoke.

Hoping that you get to the bottom of this issue.
Chris- SV Matilda H42
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Hylas Discussion / Re: Transmission/Engine Issues - Kanzaki/Yanmar
« Last post by jt11791 on September 21, 2022, 05:55:07 PM »
As far as I know, the Kanzaki KMH4A with 2.45:1 gears was the factory original on my H54 with the 4JH3-DTE.

Your lack of power problem is puzzling, but the first place I'd look for trouble is with the injectors.  I'd pull them out and have a shop spray test them.

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Hylas Discussion / Re: Edson steering cables on a 49
« Last post by Dealatis on September 21, 2022, 02:24:54 PM »
Send email for details
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Hylas Discussion / Re: Edson steering cables on a 49
« Last post by Dealatis on September 21, 2022, 02:16:43 PM »
Whitlock/Lewmar
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Hylas Discussion / Transmission/Engine Issues - Kanzaki/Yanmar
« Last post by jtedwardsen on September 21, 2022, 12:37:39 PM »
I have been dealing with engine issues after a full rebuild on my 2001 Hylas 54 #14 (Navigatio). The engine is Yanmar 125 Turbo (4JH3-DTE) with a Kanzaki (KMH4A) transmission. At this point every single item on the engine is new except for the block (transmission, turbo, fuel pumps, everything...). We have no white, blue or black exhaust at all and have not had any at any point during the rebuilds (before or after). Before I give details let me first ask a few questions to get a baseline.

1. What was the original transmission spec'ed out for the 4JH3-DTE from Hylas (yes, I have asked the factory)?
2. What should the gear ratio be for the transmission on a 4JH3-DTE from the factory?


Engine prior to rebuild was running as follows during sea trial (at slack tide):
1. 1800rpm ~7.5ktns
2. 2400rpm ~9.5ktns (cruising speed is ~2200rpm at 8ktns)
3. 3400rpm ~11ktns (Max RPM was 3400)
4. Max Prop pitch was set to 24 degrees

Engine after rebuild and was running great. Transmission was the old transmission (not yet replaced). No issues and was running as follows (at slack tide):
1. 1800rpm ~7.5ktns
2. 2400rpm ~9.5ktns (cruising speed is ~2200rpm at 8ktns)
3. 3400rpm ~11ktns (Max RPM was 3400)
4. Max Prop pitch was set to 24 degrees

After two months of running the engine, after warming up for 20 mins or so would not have any throttle if you shifted out of gear. Meaning we had full reverse or forward but after shifting into neutral and moving into another gear (either forward or reverse) we had no rpms for about 2 to 3 minutes or more then the rpms sometime would come back. At this point the mechanics replaced the fuel pump, transmission, controller, shifting and throttle cables and a second turbo (new again) after repetitive sea trials and "trial and error". Entire fuel system on the boat was bypassed using a day tank with no change.

After second rebuild was running as follows during sea trial (at slack tide):
1. 1800rpm ~6.5ktns
2. 2400rpm ~8ktns (cruising speed is ~2200rpm at 7.5ktns)
3. 2700rpm ~9.5ktns (Max RPM was 2700)
4. Transmission replaced and Max Prop pitch was set to 22 degrees (top end rpm from went from 1500 to 2700 but lost speed)

Any help would be great.

-Jon
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Hylas Discussion / Edson steering cables on a 49
« Last post by joel on September 20, 2022, 06:17:15 PM »
The steering cables and conduit come straight down from the pedestal into a metal box, turn aft 90 degrees and then exit.  Edson says they did not make the box.  It presumably has sheaves in it.  Is anyone familiar with what is in there?  Can you eliminate it and gently bend the conduit the way it was done on the 44?  Has anyone replaced the sheaves?

Joel
49#5
Rule One
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Hylas Discussion / Re: AC water circulator pump
« Last post by sjd on September 20, 2022, 11:28:39 AM »
Thanks to both responses. I spoke with a cruisair Tech yesterday. He also said there is a power relay box and that that is a good place to power check.  Since early 2000's he said the fuse requirement in the system was removed. I'm a 2010 build but i'll look behind the panel anyways. OEM (Queen Long) may have still used them.  I doubt 3 of them blew simultaneously but you never know..... it's a boat. I suspect the pump may be original and it may be time for a new one. Fortunately, it is very accessible in the top part of the bilge. Again, thanks for both suggestions and i'll post my findings/solution when I get to fixing it.
Steve   
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Hylas Discussion / Re: AC water circulator pump
« Last post by jt11791 on September 20, 2022, 03:42:26 AM »
There is no fuse that I know of.  However, when multiple AC units share a pump there is a relay box that takes the signals from the units and turns the pump on/off.  Find that box, mine is behind the instrument panel at the Nav-station, and look for possible problems there. 
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