Forum Topics Started
-
- Cummins Marine Forum Topics
-
-
QSM11 When to change injectors
This topic has 7 replies, has 5 voices, and was last updated by
2 years ago
December 9, 2021 at 1:47 pm I own a 2006 Tiara 42 Open with QSM11’s This summer the starboard engine was running a little rough at idle as I was flushing the engines after a 3 day trip. The temp on both engines is running 159 159 very steady all summer. I have propped the boat down 3 two years ago. I asked my mechanic to check it out and he said it was the injectors and it will run fine for a while but I should maybe consider replacing them this winter and now win…
Started by:
in: Cummins Marine Engines
7 RepliesDecember 11, 2021 at 2:46 pm I had an issue 6 years back with water in fuel, if one goes, they all go. You either pull them all and then make a rebuild versus buy new decision. Zero sense on just servicing one or twoā¦Last Post by:
posted: 2 years ago
-
QSM11 Alternators Replace?
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago March 8, 2021 at 10:56 am I recently had trouble with low voltage while under way causing my Radar to shut down. It has a 24 volt converter for it and draws 5 amps. The screen was showing 11.9 volts at the electronics screen. While underway. Tested the alternators Port was 14.2 and Starboard was 13.4. The port alternator is newer. The starboard alternator charges the house bank which the electronics are connected to. Should I replace the starboard alternator? Batteries l…
Started by:
1 ReplyMarch 19, 2021 at 5:31 am Without a DC power distribution diagram that shows all that you have, it really impossible to say what may be going on.. If you are not monitoring Battery Terminal voltage at the helm. it’s doubly impossible. Installing Digital Volt Meters (DVM) on Your Boat On the surface, maybe it’s you “converter” ??Last Post by:
posted: 3 years ago
-
QSM11 Fuel Tank Draw Problems
This topic has 5 replies, has 6 voices, and was last updated by
3 years ago September 24, 2020 at 11:31 am I have a problem can not figure it out. No help from Tiara or mechanics yet. I have only owned the boat for 8 months. 2 tanks 250 gallons each. The gen set runs off of the starboard tank. Boat has a fuel tank valves and they are set to Starboard to Starboard and Port to Port Every time I fill my tanks I top them off. The last 4 fills I took note of the gallons each side took Fill 1 Port 151 Gallons Starboard 122 Gallons (11 hours of gener…
Started by:
5 RepliesSeptember 27, 2020 at 5:39 pm Clark, You have somehow picked up 3 unbelievable sharp guys to work with you.. There is nothing I could add other than maybe make two simple diagrams.. Top view showing the general layout with approx. lengths and ID’s of all, and a side view showing the elevations the the tank level in relation to the off-engine filters and the filter on the engine Filter..Last Post by:
posted: 3 years ago
-
Fresh water flush system for QSM-11 How To?
This topic has 6 replies, has 4 voices, and was last updated by
4 years ago
December 31, 2019 at 2:23 pm Just finished with bench service on all of my coolers and heat ex changers. $$$ Meet a guy with twin 3208’s and he showed me his design of his fresh water flush system. He said he was a maintenance engineer for NASA. When he pulls into his slip after a run he just connects his boat up to the fresh water supply at the dock with the hose. Inside the engine room he has connected two lines to the fresh water system that run to a solenoid …
Started by:
6 RepliesJanuary 6, 2020 at 6:16 pm Robert/Clark, I did respond to your questions but the post failed to come up, will resend it when Im back on my computerLast Post by:
posted: 4 years ago
-
QSM-11 660 Test Results after Pitch change
This topic has 6 replies, has 5 voices, and was last updated by
4 years ago December 23, 2019 at 2:55 pm Tony here are the test results you asked for: Well we are finally finished with all of the coolers and heat ex changers bench service. We also had to replace the turbo’s. I have attached a pdf that shows my first test before the work and after. The results are amazing. The lines below are just for 1900 rpm before and after. Please see the PDF for full numbers Before Props 27×44 1900 rpm gph 22.1 Knots 25 Load 76% NMPG .56 …
Started by:
6 RepliesJanuary 5, 2020 at 5:15 pm Richard Lynch wrote: Seems there are a number of us QSM folks with Dry Exhaustsā¦ No fix seems available to me after all the reading I have found. Question 1 ā What does Cummins suggest after all of these years of common issues with the dry exhausts? Question 2 ā I have seen some threads on a Wet Exhaust Conversion. Is there hope for a resonable conversion? Thank you for your responses Any thoughts?Last Post by:
posted: 4 years ago
-
QSM11 Turbo Damage
This topic has 4 replies, has 4 voices, and was last updated by
4 years ago November 25, 2019 at 8:03 pm Please take a look at the 2 pics of my Turbo’s and let me know what you think caused the damage shown on the intake blades. The starboard is much worse than the Port. There is a movement in the shafts as well. Engine hours are 1632. There is no physical damage to the exhaust side but a discoloration a copper brown.
Started by:
4 RepliesNovember 27, 2019 at 1:10 pm Clark, let’s hope the prop pitch reduction resolves the exhaust leak issue… sure sounds like it will… for sure you’re heading in the right direction. The fuel burn numbers on sea trial will tell the story. I would recommend that you replace the Cummins OEM air filters with something aftermarket that’s much easier to maintain and is less expensive long-term. Also, as a part of the engine assessment & revamping&#…Last Post by:
posted: 4 years ago
-
QSM11-M Prop pitch change
This topic has 12 replies, has 4 voices, and was last updated by
4 years ago November 15, 2019 at 3:43 pm I have a Tiara 42 Open with QSM11-M 660 2006. 1650 hours . I just purchased the boat and we are replacing the manifolds and servicing the after coolers now. I have run an RPM WOT through all of the RPM’s 100. The boat is over propped and burning too much fuel in the cruse range 1900-2100. My prop man Willmington’s in LA says that 1inch of pitch reduction will bring about 90 RPM per inch. I told him I need to reduce the fuel b…
Started by:
12 RepliesNovember 16, 2019 at 8:46 pm “And more oil to the underside of the pistons and throughout the entire engine”.. It only took them a little over 2 decades to figure that out. TonyLast Post by:
posted: 4 years ago
-
QSM11 When to change injectors
