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Old 08-15-2006, 02:51 PM
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Default 3116 350 HP CAT Engines

Anyone have any comments on this engine? I'm looking at a boat that has twins built in 1997 with 650 hours.
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Old 08-15-2006, 06:53 PM
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Default Re: 3116 350 HP CAT Engines

They were not Cats best engine. The 3116 had lots of early problems, soft blocks, head, injector problems. One still running with 650 hours will probably last awhile longer. Make sure you get a complete Cat history on the motors; and get a Cat survey. No shade tree mechanics on the cheap. If anything does not check out on the "history" and then on the survey walk away. The 3116 is going to cost more to maintain because usually requires a Cat mechanic with special toosl for things like injectors. You should be able to buy the boat "right" because of the 3116 history. Oh the 3116 are discontinued motors. I think Cat shot them to bring out the 3126 (almost the same motor).
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Old 11-14-2006, 10:01 AM
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Default Re: 3116 350 HP CAT Engines

---- and had similiar problems with the 3126. Apparantly they have a good history in consruction equip. but were not up to constant marine use. late 3126s may be the exception. Check out boatdiesel.com
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Old 11-14-2006, 10:17 AM
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Default Re: 3116 350 HP CAT Engines

I have 350 hp 3116's in my 1993 34' Gamefisherman. They are right at 2,596 hours now and seem to be holding steady. I called Caterpillar with serial numbers and got history (nothing mentionable) before I committed. I also had an engine survey to work with. I don't agree with above re. costing more to maintain. No good diesel mechanic is cheap, regardless of brands they work on. Also, I would note most hourly bids I receive are less than the local Yamaha dealer! From what I have been able to learn, many of the problems were on boats where overloading the engines at cruise was common. I am fortunate in that I have a fast cruise at 2,200 rpm instead of full 2,400 rpm cruise. I am now in talks with local dealer re. repowering with 385 3126's, although I am hesitant when mine are running fine. I understand this the final year for this model - they are going exclusively to the electronic C-7. I won't hesitate to go back with Cat's. If your prospective boat has over 500 hours with no warranty work done, I don't think you would be subject to the "soft block" issue.

Good Luck!
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Old 11-14-2006, 10:28 AM
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Default Re: 3116 350 HP CAT Engines

Too risky, I wouldn't touch them with my money. Too many people I know got them with over 500 hours after cat told them the engines were good. Year later, blown engine.
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Old 11-14-2006, 11:21 AM
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Default Re: 3116 350 HP CAT Engines

check the blocks for a casting that says FASP if they have that casting walk away. If not then they are fine.



Cheers,
Will
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Old 11-14-2006, 02:10 PM
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Default Re: 3116 350 HP CAT Engines

Post50, you beat me to it! Those were the blocks that were cast in France and were considered "soft" and had bunches of problems. I recently was involved with the sale of a vessel with a 3116 and before I advised the buyer I did extensive research for him about that specific motor. I ran the serial number with my local Cat Marine dealer and asked him to tell me as much as he could about that motor and what to look for, the letters in the forward block casting was one. He also mentioned that if the motor had over 300-400 hours on it, chances are it is a good one as the problems all seemed to develop early on. I verified this with two independand marine diesel surveyors prior to reporting this to my client and advising him to continue with the surveys. In additon to this advice, make sure you have the engine surveyed by a highly qualified marine diesel surveyor, one with impecable references is always preferred.
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Old 11-15-2006, 03:26 PM
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Default Re: 3116 350 HP CAT Engines

Yes, in almost every case I know of the problems with the blocks would show themselves within 500 hours. My company had a customer last year with a 91 model (i believe) that only had 400 hours on it and it had the soft block. Even after 14 years since new, CAT supplied the guy a new short block and only asked that he pay the labor to R&R. Needless to say the owner was very happy with what CAT did.

The 3116/3126/C7 is a very popular engine and probably the single most common diesel in our area (and probably most areas). It is a good engine that runs very well. You do have to have the special tools to adjust the overhead. With proper maintenance and loads, the engine should be good for at least 4,000 - 5,000 hours.

Michael
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Old 03-08-2010, 06:01 PM
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Default Help with cat 3116's

Quote:
Originally Posted by Post50 View Post
check the blocks for a casting that says FASP if they have that casting walk away. If not then they are fine.



Cheers,
Will

Where are these located on the block?
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Old 03-08-2010, 08:03 PM
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Read the Cat 3116/3126 archives at boatdiesel.com. 8+ years of comments and questions direct to your point. This will be the best $25 you have spent on boating.
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Old 03-08-2010, 08:21 PM
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I second the boatdiesel.com recommendation. I recently had to experience the learning curve with the 3126b's as part of my recent purchase. Well worth the few dollars and the handful of hours it will take to read up on these Cats. Be sure to have oil samples taken to make sure the aftercoolers haven't leaked. Also make sure you are not overpropped. Good luck.
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Old 08-06-2010, 11:44 PM
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Default Some problem with CAT 3116 350 HP

Bonjour,

I apologize about my poor English.

My name is THOMAS Frédéric . I'm French and I live in New Caledonia Island . It's a French territory not far from the east coast of Australia ( about 1500 miles ) and the same distance from New Zeland.
I have a big problem with my 2 engines Caterpillar 3116, 355 HP , fitted on a 40' FAIRLINE BOAT built in 1995 . The two engines are broken one month ago . So , I would like some informations about similar big problem. To day , I found your adress on the net but I don't know what I have to do. May be somebody can help me ?

I give my address : thomasfrederic@mls.nc
Thank you very much for your help.

Fred
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Old 08-06-2010, 11:47 PM
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They were not Cats best engine. The 3116 had lots of early problems, soft blocks, head, injector problems. One still running with 650 hours will probably last awhile longer. Make sure you get a complete Cat history on the motors; and get a Cat survey. No shade tree mechanics on the cheap. If anything does not check out on the "history" and then on the survey walk away. The 3116 is going to cost more to maintain because usually requires a Cat mechanic with special toosl for things like injectors. You should be able to buy the boat "right" because of the 3116 history. Oh the 3116 are discontinued motors. I think Cat shot them to bring out the 3126 (almost the same motoBonjour,

I apologize about my poor English.

My name is THOMAS Frédéric . I'm French and I live in New Caledonia Island . It's a French territory not far from the east coast of Australia ( about 1500 miles ) and the same distance from New Zeland.
I have a big problem with my 2 engines Caterpillar 3116, 355 HP , fitted on a 40' FAIRLINE BOAT built in 1995 . The two engines are broken one month ago . So , I would like some informations about similar big problem. To day , I found your adress on the net but I don't know what I have to do. May be somebody can help me ?
I give my address : thomasfrederic@mls.nc
Thank you very much for your help.

Fred[/size][/size]
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Old 08-07-2010, 08:46 AM
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Quote:
Originally Posted by jim316 View Post
Anyone have any comments on this engine? I'm looking at a boat that has twins built in 1997 with 650 hours.

That tells me it is something like a 40-44 SeaRay, Siverton or Cruisers, which is a bigger issue than 3116's, because those boats were just too far underpowered.

The 3116's have an interesting history - they were used extensively by Albemarle, Blackfin, Cabo, Luhrs and Tiara in their 31-33' express fishing boats and in those they have had both a good service life and few problems; they were also used in 40-44' express and bridge cruisers - and that application is the biggest source of their negative history (outside of the soft blocks that affected 500 motors (out of the more than 100,000 blocks cast) and whcih CAT replaced 100% of them under warranty).

Assuming they are in a suitable boat (31-35' under 20,000 lbs), and have been maintained, there is nothing wrong with them. The biggest downside to them is injector work, fuel timing and valve adjustments, unless you are willing to spend the $3,000 (which few diesel techs outside of CAT have) for the required special tools are not a diy items. On the plus side, for the diesel world parts are cheap and 100% available.

Before you buy, get a CAT dealer to run the complete history on them, and then have them do a PAR analysis.
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Old 10-13-2010, 06:34 PM
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topgun is a 11mtr sports fisher with 2 3116 300hp cats she has been in charter most of her life she has done im excess of 6700hrs burns no oil between services had both heads replaced shortly after delivery to original owner under factory warranty and a couple of years ago 1 turbo ,most of her hours have been trolling for marlin over 300 caught or tagged apart from normal replacement of belts filters and engine anodes thats it
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Old 10-13-2010, 07:33 PM
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We run 3116s in a 35' Viking, Lot's of balls, but with under 2000 hrs since new, we're being told to rebuild 1 after finding that it's using (not burning) 2 times the oil as it's twin sister. Something about too much crankcase pressure. Oils too new for analysis, just changed for a canyon trip. Also burning 10% more fuel.
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Old 10-13-2010, 07:58 PM
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Default Cat 3056

Hows this engine compared to the 3116?
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Old 10-14-2010, 07:36 AM
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Quote:
Originally Posted by sharktripper View Post
We run 3116s in a 35' Viking, Lot's of balls, but with under 2000 hrs since new, we're being told to rebuild 1 after finding that it's using (not burning) 2 times the oil as it's twin sister. Something about too much crankcase pressure. Oils too new for analysis, just changed for a canyon trip. Also burning 10% more fuel.

what is the serial number of your engines? CAT used aggressive rings up to 4KG02171. Ring material was changed from plasma facing to chrome ceramic surface "CCS" in 7/93 production at 4KG02172. Engines built prior to 4KG02171 had the potential to need overhaul a little early due to the hard rings. If your serial number is in this range, chances are the other engine isn't far behind.
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Old 10-14-2010, 07:50 AM
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.

Last edited by sclancy; 10-14-2010 at 07:55 AM. Reason: typo
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Old 10-14-2010, 07:55 AM
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I agree that you should read boatdiesel. And the post below seems to be spot on based on our actual experience. Nearly every post on this thread "warns" that 3116s are bad, had issues, are not Cats best motors....yes there is some fact buried in there but not much.

We have 1000 trouble free hours on 3116s 350hp in an 18,000lb express.

When you read boatdiesel, most issues were installs in largers boats and/or running them too hard.

We run ours at 2200/2400 rpms per Cats specs and have been very happy. They are not nearly as finnicky when it comes to bad fuel but they are also not as efficient as electronic motors.

If Cat SOS samples have not been taken every year and made available along with cat authorized service (rack/injector adjustment, aftercoooler cleaning, etc) I would probably move on. You dont want motors that were overpropped, run at wot and/or not serviced properly - BUT this goes for any diesel....Cat dealers will tell you that one SOS sample tells you very little. you need samples year after year for Cat to compare to idenify issues/problems.

Service is reasonably priced through cat dealers and parts are readily available.

So called soft blocks were all replaced by cat under warranty early on - i doubt any are left out there....watch out for 1997/1998 and older 3116s that have the old design turbo - the turbor whine is very loud. Cat redesigned the turbos around '98'99 with a built in silencer. The new turbo plus the walker airseps with silencer makes a big difference running at cruise/wot.

Three cat dealers that we have used (1 MD, 2 NJ) all told me that the failure rates of the 3116 and later the 3126 were very low considering the number of units placed in service.

Let me say it again - make sure the boat you are buying is/was not overpropped....if it doesnt turn up to 2800/2850 fully loaded that engine is being overloaded....

good luck.

Quote:
Originally Posted by LI32 View Post
That tells me it is something like a 40-44 SeaRay, Siverton or Cruisers, which is a bigger issue than 3116's, because those boats were just too far underpowered.

The 3116's have an interesting history - they were used extensively by Albemarle, Blackfin, Cabo, Luhrs and Tiara in their 31-33' express fishing boats and in those they have had both a good service life and few problems; they were also used in 40-44' express and bridge cruisers - and that application is the biggest source of their negative history (outside of the soft blocks that affected 500 motors (out of the more than 100,000 blocks cast) and whcih CAT replaced 100% of them under warranty).

Assuming they are in a suitable boat (31-35' under 20,000 lbs), and have been maintained, there is nothing wrong with them. The biggest downside to them is injector work, fuel timing and valve adjustments, unless you are willing to spend the $3,000 (which few diesel techs outside of CAT have) for the required special tools are not a diy items. On the plus side, for the diesel world parts are cheap and 100% available.

Before you buy, get a CAT dealer to run the complete history on them, and then have them do a PAR analysis.
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