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| The 3116 injector saga if you dont know... Its a matter of when not IF you get compression in the fuel system. And these engines are getting older by the day.
To reseal you must pull the rack, rockers, and injectors, thats the easy part. Now your onto the sealing surface which is a brass/copper injector sleeve. You must ream the sleeve to get a new sealing surface with a specialty tool group. Then if you think you did a good job you can re-install the injector with another specialty tool group. Then you can set the injector height and rack with yet another tool group. Then you can fire it up and fond out your still getting combustion gas into the fuel system.
But ok you say why ream them just remove them and replace the 30 year old injector cups.
Well thats another tool group of crushing the cup and using a puller on a very soft cup. The cup breaks off inside the head. So you end up removing the head to beat out the cup from the inside out. Then you install a new injector cup which requires yet another special tool group.
Short and sweet of the story, it takes like 4 special tool groups that are not cheap. It takes skill, nearly an art form. The service procedures are probably 75 pages long. And thats if you find a mechanic that is even familiar with them and has the tools.
On top of all of that 4 cylinders are behind the firewall or access from the doghouse. In a nasty 1994 kodiak that probably smells like rat pee and poop.
Oh and 40% of the time it was cheaper to just quote a new head by the end of the job, yet nobody wants a quote of 5k+ to fix a 1994 kodiak.
The injectors and pump, pretty much bulletproof, the sealing of the injectors was poor.
The rack on the injectors is very similar to a 2 stroke Detroit, and the 3116 marine engines had stainless injector cups, later in life I found that out. Not sure why the trucks never updated to stainless cups, probably different head.
A 3116 is also a 2 valve engine and a pooch.
Now there was a rare 3116B heui engine, had oil tubes to the heui injectors, a nearly retrofit engine. Never seen one in a kodiak or topkick, only cab over hino or isuzu. Those were very good engines.
But the 3126B anyone with a set of tools can work on but diagnostic will require electronic service tool. Much easier to work on 10 fold.
Edited by TexasPecans 9/9/2025 08:17
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1994 Kodiak truck
