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Detroit 6v92 Rebuild

Old 04-25-2017, 01:26 AM
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Default Detroit 6v92 Rebuild

Like some opinions. 1997 43 hatteras xpress stbd engine cracked a head recently confirmed by our mechanic. 18k for a top end rebuild and 30k for major overhaul. The engines had top ends done before we bought it and we were told they were majored classic lying boat salesman, lesson learned. Our mechanic recommends the major since the major parts have around 4000 hours on them. We can expect issues with the stbd side at some point so plan to budget another 30k for that rebuild. Those engines push 630 hp and boat is 18.5-21 kt cruise burning 40 and hour. Is it worth looking into putting new engines in the boat cummins or cat? how much more would that be 45k per side installed? We like the boat but are on the fence about what to do facing a major repair with 20 year old engines.
Old 04-25-2017, 01:46 AM
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Hello. I think (correct me someone if im wrong), those are the souped up versions of the 6V92, I have mostly seemed them in 550hp and below, so probably the best thing is the major rebuild as apart from the high hours, the parts are quite stressed, I personally would be okay with going with the older engines, if I decided to rebuild I would go with the Cummins, very good motors, as for price, when you take into account everything that a repower entails, I would ballpark about 75k to 100k per side all in, including any fibreglassing, stringers, mounts, controls, gauges etc. etc. You might be able to get some factory rebuilds with warranty at a reduced price, ditto for the Detroits, hope this helps.
Old 04-25-2017, 04:29 AM
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Originally Posted by BCooksey View Post
Like some opinions. 1997 43 hatteras xpress stbd engine cracked a head recently confirmed by our mechanic. 18k for a top end rebuild and 30k for major overhaul. The engines had top ends done before we bought it and we were told they were majored classic lying boat salesman, lesson learned. Our mechanic recommends the major since the major parts have around 4000 hours on them. We can expect issues with the stbd side at some point so plan to budget another 30k for that rebuild. Those engines push 630 hp and boat is 18.5-21 kt cruise burning 40 and hour. Is it worth looking into putting new engines in the boat cummins or cat? how much more would that be 45k per side installed? We like the boat but are on the fence about what to do facing a major repair with 20 year old engines.
You are looking at much more than $45k per side to repower. I inquired about the cost of Cummims QSC motors for my boat and was told to budget $100k for the engines, gears and control systems. Your boat would need QSMs so I would think you would be in the $120k range before any labor to install.
Old 04-25-2017, 04:34 AM
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OK well the new engines will be out of the question then. Looks like we are leaning toward the major overhaul.
Old 04-25-2017, 05:25 AM
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A friend of mine has his boat in the yard being repowered with Cummins QSM-11/660hp. The total with gears, gauges, and controls for two stations is $140k. They are considered remans, but they are new engines, they just don't meet the current tier 3 emissions standards.
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Old 04-25-2017, 08:48 AM
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30K for a 6v92 overhaul? You must've gone through a dealer. The last 6v92 I rebuilt was a 625HP and I think it came to 3 grand a hole with heads.

If you're cracking heads, take some load off of the engine. You should see 2350 rpm fully loaded. If it only goes 2300, she's overloaded.

These motors do NOT, I repeat, do NOT like high cylinder temperatures. If you'd like a more in depth conversation about it, feel free to pm me and we can exchange contact info. I've built a bunch of these engines.
Old 04-25-2017, 09:21 AM
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18k for a top end only rebuild is high. You need to also monitor exhaust gas temps. 4000 hours is not high.But given that you are not sure about them it might be smart.

I assume this is PER engine....
Old 04-25-2017, 09:27 AM
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Default Cummins

Originally Posted by WavRidr359 View Post
You are looking at much more than $45k per side to repower. I inquired about the cost of Cummims QSC motors for my boat and was told to budget $100k for the engines, gears and control systems. Your boat would need QSMs so I would think you would be in the $120k range before any labor to install.
Depending on location this is about right. With transmissions, controls, mounts, etc, you might be closer to 150k for the QSMs, but I think that's a better investment. Also worth considering if you're ready to be attached to the boat for the long haul after that kind of investment. To me, the fresh power would be a better investment either way - either you're married to the boat in which case you'll appreciate them long term OR you'll sell the boat and have a broader market due to the new power (granted you won't recoup all your dollars, but the boat will sell much quicker)
Old 04-27-2017, 01:33 AM
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New engines are not an option because of cost. The rebuild our mechanic will perform is everything down to the main bearings quoted 28k minus core refunds about 2500$. Doing this we are committed to keeping the boat and will budget to rebuild the port side at some point.

After the eventual port rebuild the boat will have essentially two new engines.
Old 04-27-2017, 06:01 AM
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Might want to look into a reman long block as an option. They come with heads installed. I think they are available for about $14,500.
Old 04-27-2017, 08:54 AM
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18K for a top end seems WAYYY high. 30k for a total rebuild, i hope thats having the blower rebuilt, governor rebuilt, new turbo, etc. I think we were in the 20K range for an 8v92 with a new block and all new parts.
Old 04-27-2017, 10:51 AM
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Here goes. Same boat (except mine was a 1996), same engines (except mine were 550hp per) and my major was in 2010 on the port engine. These are the exact costs I paid:

HEAD $2,670.00 HEAD $2,670.00 TURBO $2,650.00 KITS $2,724.00 MISC $2,636.42 FREIGHT $220.61 SUBTOTAL $13,571.03 TAX $689.14 PARTS $13,571.03 CORE CHARGES $1,499.03 TOTAL PARTS $12,072.01





TOTAL LABOR $8,785.00 TOTAL LABOR AND PARTS $20,857.01
Old 12-16-2018, 01:21 PM
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Update on this thread for any Detroit owners. We did rebuild the stbd engine cost 30k but with no new turbo. Ended up doing 2 new heads all new kits and new turbo on the port side for 20k. Sold the boat 100hrs later. Want something newer with cats. Perhaps 48
cabo.
Old 12-16-2018, 01:29 PM
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Thank you for closing the loop. If you don't mind sharing what it sold for.

Old 12-16-2018, 09:46 PM
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Good move. High horsepower 692s are a kiss of death. There is a really nice 45 hatteras on here with qsm11s in it for 140 range. Not related to the sale at all but was impressed with the boat
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Old 12-20-2018, 05:46 AM
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We sold for 140k. I saw that Hatteras but she has 5000 hrs donít want another rebuild.
Old 12-20-2018, 09:30 AM
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Originally Posted by BCooksey View Post
Like some opinions. 1997 43 hatteras xpress stbd engine cracked a head recently confirmed by our mechanic. 18k for a top end rebuild and 30k for major overhaul. The engines had top ends done before we bought it and we were told they were majored classic lying boat salesman, lesson learned. Our mechanic recommends the major since the major parts have around 4000 hours on them. We can expect issues with the stbd side at some point so plan to budget another 30k for that rebuild. Those engines push 630 hp and boat is 18.5-21 kt cruise burning 40 and hour. Is it worth looking into putting new engines in the boat cummins or cat? how much more would that be 45k per side installed? We like the boat but are on the fence about what to do facing a major repair with 20 year old engines.
I just had the starboard engine on my 1995 43 Hatteras Convertible completely rebuilt by Detroit Diesel of Florida. They did a great job but the cost all in for parts and labor was significantly more than the $30K you are estimating. Doing some extensive maintainence to the Port engine to try and avoid the issue that caused the STB engine to fail. Completley descaled the engine, flushed multiple times, new cooling fluids, thermostat etc. Looked to repower. Labor cost to completley remove the aft bulkhead and the floor to remove the engines is pretty steep. I assume your floor over the engine is solid and completley glassed in as mine is. Cutting out the floor and everything above the engines to facilitate removal was pricey. When the new power is installed you then need to completley glass in new floors etc. I was looking at $150K+. I passed.

My 6V92 are rated at 535 hp each. Your engines are at the max rating for this engine, I would never run them above 1800 RPM. The 600 + hp versions of these engines do not last long when pushed hard. I cruise at 1800-1900 with a speed of 18-19 knots, burning about 35 gallons an hour. Fast enough for me. I love my boat and I am in the process of doing a lot of upgrades to it. Great hulls and the boat raises fish. Good luck with whatever you decide to do.
Old 12-20-2018, 08:51 PM
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If your Detroits are the 625hp version they are DDEC electronic version & are very tempermental!! A spotless clean bottom is a must before a trip
Old 12-21-2018, 06:16 AM
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Yes we had the DDEC 635hp versions. We had a freelance mechanic rebuild the stbd and top end rebuild/turbo on port. We never ran her over 1850 before rebuild. That engine was well before itís time technologically, DDEC system was very nice with all the parameters you could observe and manage. We want to move to cat power.
Old 12-21-2018, 04:40 PM
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Iím running the famed DDEC 625 hp version in a 43 Viking express thatís been meticulously maintained. Iíve read so much about them being nothing but problems if pushed but I really have no reason to run past 1850 as theyíre pushing it 25 knots and they seem to be the right power for the boat. Iím not convinced a well maintained motor wonít hold up fine and run for years.

But, Iím not repowering a new and Iíll eventually need to refresh (at 2,500 hours now) so Iíd love to know a realistic expectation when the time comes.

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