cat 3116

This topic contains 8 replies and was last updated by john-lynch 9 years 7 months ago
September 30th, 2011 2:38am
Hi Everyone, one of my techs is having trouble with this engine, he installed replacement injectors (and cut the seats) having issue with compression pushing back into the fuel system. All injectors seem to be seating properly. Any thoughts on where to go with this? He had it running for awhil;e but you could hear one cylinder misfiring. It will start, then dies, lots of air out of the return. We only have two of these in our fleet and we seem to be getting nowhere quickly. Thanks for your thoughts
December 15th, 2011 2:29am
Are you sure the seats are cut correctly? If this is in a top kick then the plactic fuel lines that go from the tank to the metal fuel lines at the motor are famous for sucking air at that connection>
December 16th, 2011 10:40pm
Hello, I have worked for a Caterpillar dealer for the last 20yrs. Most likely the seats have not been cut properly, or the in have not been seated to 135inch lbs. If that has been done it is more likely then not that the in cups are cut to their lower limit and you will need to replace the in cups at this point. If you have not cut seats or installed and synced inj before in a 3116 before I would advise you to take the engine to a Caterpillar dealer. They have the special tools and knowledge to make this engine run right. This engine is also notorious for breaking the top piston ring causing a dead cyl. Hope this helps.
December 17th, 2011 4:18am
Thank you for your comments [email protected], we are glad to have your expertise from your experience. I am sure that your comments are right on the money, but we have to wait to see they the problem is rectified.

When altfueltek corrects the situation, we need to know what he finds.
January 26th, 2012 1:43am
I agree with Bill on using the injector seating tool Cat # 173-1530. We have 13 of these engines and have gone through a few of the same compression leakage problems. If the seating tool does not remedy the problem you need to find a Cat dealer who has the seat removal and machining tools.

Check out these posts on seating injectors
January 30th, 2012 11:00pm
Thank you all for the replies. The problem was due to our inexperience in cutting the seats. We were afraid of going to deep. Third or fourth time did the trick. Not our favorite engine at this point in time! But it is up and running again, Thanks everyone.

November 5th, 2013 4:23pm
I agree with John and Bill for the most part on this issue.I have found out you need to think about how many miles/hrs on this engine,sometimes it is more economical to use a reman head from Cat if you have the equipment to replace the head with.I have had a lot of issues with over the years and it is usually cylinder 5or6 that causes this problem.The main problem I have with this is ,all of mine are pusher buses (engine in rear),cylinder 5and 6 are areal pain to replace tubes on.I am just giving info to think about.
November 10th, 2013 1:05pm
Roger, It was always #5 exhaust for us as well. We just went for the reman head for reliability. Presently we are in the process of selling the last of our pushers with 3116 engines.
November 18th, 2013 4:00pm

Some people are more privliged than others.I am happy for you.I will probally be retired before ours are gone .They are in 95-96 Thomas pushers.I have seen a lot of engines go and come,the 3116 is one I will be real glad to go.

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