Cummins Valve Adjustment // Simple Procedure Explained

Every 100k miles or so you will want to perform a Cummins valve adjustment procedure. In this short video I'll show you the specifics of performing this lash adjustment, It's not very complicated and easily something you could do within a couple hours.

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[sandyt]

Great!! Good and simple and by far the best I’ve seen yet. No show business no unnecessary stories just good straight facts.

[kensurf]

I really appreciate this video. straight to the point. thank you

[johnnywad]

About 20 years ago my younger brother had Kenworth with 855 big cam 2, that i and a buddy had did a inframe overhaul. We acquired heads with the biggest valves Cummins made. We installed a large 676 Sweitzer turbo. After the break in period i told my brother about reading in a old cummins generator service manual, that the injectors were set at 40lb/ inch, instead of the usual 72lb/ inch. Loosening up the engine af the injectors and reducing valve last by .001 to loosen them up also. My brother said out on the road, fully loaded, he could " go around and pass" 500 hp Cats! The jacobs engine brake worked so well my brother said it was like slamming on the brakes and used the word" violent" to describe how well the jake brake worked. If you know how it works, one can experiment and make things qork even better!

[reelfun]

Thank You . Good info . I feel more comfortable adjusting the valves.

[matthewperry]

Speaking my language with this one, performing some old school valve adjustments. 😁

[brownjamie]

That was an awesome video, Thanks! I really don't wanna pull that valve cover AGAIN but I think it's worth it at 160k with a bunch of go fast part just installed

[CarlosMerino-tsrw]

I thank very much for your excellent explanation, thank you very much, God bless you all ❤😢😅 your the best!

[joeperry]

Thanks for taking the vid while the cab off so we could see what you were doing. That valve clearance is kinda important I got a free Honda gx390 because the exhaust valve was so far out of spec it wouldn’t open 5 min and 2 wrenches later purrs like a kitten.

[mikeb]

Good video, may I suggest the you can buy the feeler gauges with the bend on them, also to confirm that all gaps are the same you can use a inch lbs torque wrench, and the jam nut for the adjuster should be done with a torque wrench

[mikeb]

Good example of cummins valve adjustment, but can I give a suggestion when your able to adjust the valves with the cab off
You can use a inch lbs torque wrench on the valve, I have been doing it for many years and this way you will know that every valve is the same. Also you should hold the adjuster when torquing the jam nut, it could move changing the valve lash, also for novices you should mark each valve adjustment so when all valves are done each valve will be marked. Even though I have been turning wrenches 🔧 for 30 plus years I still mark the valves and injectors if needed.

[CharlesSpaulding]

OK, I’ve never done this on a diesel, but it looks fairly simple. Except I’ve got one question because I’m gas engines. We pull the spark plugs so the engines easier to turn. With the compression ratio of a diesel what are you doing to release the compression so it’s easy to turn, I’m curious cause I’m wanting to do this next weekend when I get home

[joelcrowley]

How do you disconnect the 2 oil drain lines connected to valve cover. 2015 ram

[DavidJordan-qn]

Very cool channel….just retired and have a need to focus on my new lift choice and 2004 Cummings Dodge 2500. Getting pumped to start the maintenance. Nice job!!!

[jacobm]

Do you think I could do this on my own with absolutely zero motor experience besides changing the crank case filter? I’m at 141k and I think I am hearing a slight tick noise from the valves. I was planning on paying someone to do the adjustment at 150k like the manufacture recommends but I feel like it should be done sooner. Also, if I don’t do it sooner do you think I’ll be okay? I can only really hear the tick over 65mph or when I’m accelerating. The truck is deleted and I’m planning on towing a toy hauler with it next month (3k miles) so I’m slightly worried lol. Thanks.

[KennethFuimaono]

Quick question. Your crank turned pretty easily with your ratchet, did you relieve pressure somewhere.

[MM_in_Havasu]

Yep, setting valves is a way of life with solid lifters. Your Cummins uses a distributor-type injector pump instead of a PT fuel system, so no injector torque to set.

[scrawny]

How about let us know what engine it is !
I don’t want to watch a 7 min video to find out it’s a 5.9 not a 6.7 and year would be great in the description!

[kensurf]

Quick question. Since there's lots of compression in the cylinders, did you do anything to relieve pressure so the crank turns easily with a 1/2' drive ratchet like you just did.? thanks in advance. Been many years since i did one last.

[JoshuaWagnon]

I adjusted my valve lash and it is still knocking when I put a load on it. I can put my foot in it when it’s out of gear and it’s fine. As soon as I do it in gear it starts knocking. I turn it off and turn it back on and it is fine. What can be the problem?

[MrDogmeat]

What do i do if i removed the front pulley / harmonic balancer once before replacing front crank seal. Don't know if i put back the same as it came off, so my timing mark might be off from top dead center