3116 Cat

[Jim Fulmer]

Anyone know anything about them... ..... what does it take to turn it up... ..... I haven't even looked at it.



Jim

 

[Oasis-3]

3126

I have a 3126 CAT 250 HP and Edge makes an EZ for it.

I think the 3116 has the manc. type fuel pump on it.



Sorry not much help



Cliff

 

[mhuggler]

There is no injection pump on a 3116; what you see on the side of the engine is just the governor. Remove the valve cover. Each cyl. has it's own set of three rocker arms(intake,injector,and exh. ). The magic fuel screw is between the no. 1 and no. 2 rocker arm sets. Give 'er about . 5 of a turn counterclockwise. It takes a special tool to do this with the rockers still on(a wrench with an allen through the middle). Try removing the no. 1 rockers to use a regular wrench. Rocker bolts get torqued to 25 ft. lbs. If you want to adjust the valves it's . 015"intake and . 025"exhaust. Don't mess with the injector adjuster(also takes special tooling).

 

[CATCRACKER]

i have heard people say this engine 3116 6. 6l was not the best they ever made (very expensive to fix poor mpg)along with my 3204 (darn 2 ring piston). the old mechanical 3406 is what made cat a CAT! then engine 3116 is very heavy at 1500lbs. Also if i am not mistaken this is a perkins design painted yellow perkapillar

 

[mhuggler]

Close..... but no cigar! The 3116(3114) is 100% Cat. Anything smaller would be either a Perkins or a Mitsubishi. I can't really vouch for the reliability of the 3116; I just pulled the cover off of one that dropped a valve. Can't wait to give the guy his estimate $$$$$$!

 

[Oasis-3]

I was told that when a 3116 or a 3126 need rebuilt that it is cheeper to put in a new motor?



Cliff

 

[bgilbert]

The 3116 and 3126 have nice upgrade turbo's for our rigs.

 

[JLEONARD]

The 3116 and 3126 have nice upgrade turbo's for our rigs

Bill you have a one track mind... er, I mean you are really focused. :-laf



Maybe they use a spring somehwhere that will fit in the VE?

 

[MMiller]

You could tweak the timing, by adjusting the rockers for the injectors. I have never past the specs, except for the fact that I adjust them to the tight side of spec. This advances the timing a little, by compressing the injector spring some more. You really need the Cat tooling to tell how far you have adjusted it.



I would recommend not pulling the #1 rockers off as all the other cylinders are "synched" with number one. When you pull the rockers you *should* reset the #1 injector timing. I really work dilagently at not removing anything from #1 unless absolutely necessary. The fuel screw is in between #1 and #2 rockers. I'll bet that if you have a 1/4 drive socket set with the rachet that the screw will go through, so you can stick an allen wrench down through it, you will be able to adjust it. If it has been a long time since anybody has set the timing, and valve lash, it should be done. The last one I did the timing was retarded from spec, due to normal wear.



As far as how far you can go? Don't ask me, I just set them to spec, I don't toy with stuff that we have to warranty. The 3100 series is not my most favorite Cat engine to work on. They have dry liners, which means bore, press out the liners, or differnt block come rebuild time. The mechanical linkages under the rockers are a pain to work with, adjust, synchronize, etc. The latest model 3126b's and C-7's I think are better. The are fully electronic have better injector sleeves. I am still having some electronic problems with the c-7 in my service truck.



This is probably way more then you wanted to know about the 3116. If I had to make a choice, I would choose a 5. 9 cummins over the 3100 engine line. The 3100 is not as responsive, hard on fuel, and in my opinion not any more reliable or longer lived then the 5. 9 cummins. The one in my company truck is 230 hp and 660 torque. It runs ok. Not going to complain.



The perkins is indeed a differnt line, anything smaller then the 3100 series is perkins, or mitsus.



Michael

 

[mhuggler]

Removing the rocker arms doesn't disturb the injector rack bar. Rack sync is done separately from the fuel timing/valve adjustments. Also, the 3100 series engines are not sleeved. If you found one with sleeves in it, the engine probably had a failure and was sent to the machine shop for repair sleeve fitment. I agree with the overhead being adjusted regularly; they tend to kick pushrods if the lash goes too wide.

 

[nickleinonen]

just bypass the governor and make a set of linkage that directally controls the fuel rack... lots of extra power avalable there then... and will fuel as quick as you can move the rack. . you'd just need something rigged up to control low idle, and for governed speed, you watch the tach... no need to see that engine spin to 5k :-laf...



[i've heard about a sled pulling semi truck that had an 8v92 DDC green grenade that had 2 controls for the engine... one controlling the racks directally [foot control], and one controling the turbine side of a VGT turbocharger [mechanical hand control]. no blower on that engine [started with compressed air feed]. .

 

[mhuggler]

Am I sick in the head, or does that actually make sense?! Don't answer that!!! Really though, it's pretty easy to flog the cylinders with fuel and cause flame-out if the turbo isn't upgraded on 3116's. It's a good turbo, but the compressor wheel just isn't big enough to support a huge increase in fueling.

 

[nickleinonen]

Am I sick in the head, or does that actually make sense?! Don't answer that!!!

:-laf:-laf:-laf:-laf



i guess i would be sick in the head too... [i do this at work when starting a cold engine, but in reverse... i disconnect the fuel rack to the left side [V engines] of the engine and tie it back at 0 fuel so i don't smoke the shop out]