M1081 Injectors

Shbennett1985

New member
16
10
3
Location
Carthage nc
Great eye on the missing bolt in the bracket under power steering pump!

I’ve got the truck back working on timing the injectors as we speak. I’m going off the spec listed on the valve cover but I’m confused. There are two data plates. One says (aluminum)3126 and the other says 3116? The aluminum plate states injector timing should be 65.39mm. Do you think this is correct?
 

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Ronmar

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Port angeles wa
Great eye on the missing bolt in the bracket under power steering pump!

I’ve got the truck back working on timing the injectors as we speak. I’m going off the spec listed on the valve cover but I’m confused. There are two data plates. One says (aluminum)3126 and the other says 3116? The aluminum plate states injector timing should be 65.39mm. Do you think this is correct?
Well that right there is a genuine Caterpillar typo. That is a 6.6L 3116, note both labels have the same serial number... Yes, 65.39MM or 2.574” is the injector height/timing setting.

So, your truck has the bracket that goes from the lower steering pump bolt to the side of the engine block? It is #17 in this drawing, they are usually green, and many trucks have been missing them, which results in a cracked timing case, usually with a little help from out of balance driveshafts...

CB9C1FD7-DC8B-4642-AB41-68557FFADF35.jpeg
 

Ronmar

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Port angeles wa
Thank you, and yes I do have the bracket, in photo below.

I’m finding some of the injectors are set at 2.60in. Would this cause issue?

Is this correct specs for valve timing?
.38mm intake valve
.64mm exhaust valve

Working on the valves as we speak.
The timing tolerance is +/- 0.2MM or .0074”, so probably not that much difference.

yes, that is the correct valve clearance.

B7A72128-FABA-4FA7-AD21-C33567203B4F.png
 

Shbennett1985

New member
16
10
3
Location
Carthage nc
Ronmar, you are amazing. Thank you so much for the encouragement. I couldn’t have
done this valve adjustment without your help! I wish you the best karma man! 🙏🏻🙏🏻

The engine runs much better now after valve adjustment and injector timing adjustment. Holds 50 mph pretty well on flat ground. Much less smoke. Over all far better power. Here is a video of the engine running without valve cover, thought it was cool!
 

Ronmar

Well-known member
1,039
827
113
Location
Port angeles wa
1 152
2 162
3 214
4 225
5 201
6 160

also, what is the switch on the pic below.
Those are still a little uneven, the racks may need adjustment, but I would run some good cleaner thru it first...

that isn’t a switch, that is a battery level tester for the old style capped wet cells. Remove cap, insert into hole and if it can touch electrolyte it will light the led. Doesn’t work with sealed batteries...
 
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