Adjusting Fuel Screw on DB2 pumps with pics

[saburai]

Nope, just rtv. Never had a oring

That's weird. Any ideas on what the groove is for?

 

[Dieselcrawler]

A lot of the locations on our engines that get rtv have a groove, like the top gear tower cover.

 

[pelky350]

I think it just helps the rtv seal and stay in place

 

[tbirdfiend281]

does the fuel screw stop when it has reached maximum fuel, or minimum fuel? Or is it up to the 'adjustee' to count the turns and know where max/min is?

 

[vegas39]

Never maxed mine out but pretty sure it stops each way.

 

[79jasper]

Should feel a slight resistance making it stop. Don't go any further, or bad things happen. Lol

Sent from my SM-G892A using Tapatalk

 

[chris142]

I never saw a reason to remove the oil filler. Just put a mirror there and cranked the engine over till I saw the allen wrench thing in there.

 

[tbirdfiend281]

why not just bar by hand?

 

[Thewespaul]

You can bar it by hand if you have room, I use a remote starter and get it lined up that way. The screw will bottom out once you reach the maximum adjustment for fuel

 

[Dieselcrawler]

And backing my it off it can fall out, I remove the cover, just makes it easy. No guessing. Plus most of the time the trucks I have played with the cover is seeping anyway.

As for turning it all the way in, you can snap it be careful. Also definitely not recommended on a non turbo truck, and even with a turbo you need a pyro. They get hot quick. I just replaced an engine cause the 17 year old owner cranked it all the way up. Ended up melting things down internally.

 

[chris142]

In another life I was a truck driver. After leaving the yard we would turn the fuel up. We also installed a small mirror that pointed at the stack.

Used it to watch for smoke or fire out the stack. I still do this on my idi.so far I have not burned it down

 

[Macrobb]

More or less, if you aren't smoking out the exhaust, you aren't overfueling and your EGTs will stay sane.

Also, remember to back off the "torque screw" a good 1/4" if you have it, if you are cranking the fuel up. It basically limits fuel at higher RPMs, what you want more of if you have a turbo.

 

[tbirdfiend281]

where this fuel limit screw that you are calling 'torque screw' located? I feel like the fuel limiting screw may be the saving grace on the pumps if you do turn them up a lot, to keep them from melting down.

 

[chris142]

where this fuel limit screw that you are calling 'torque screw' located? I feel like the fuel limiting screw may be the saving grace on the pumps if you do turn them up a lot, to keep them from melting down.

I dont think all pumps have one. I have never seen one

 

[sjwelds]

92.5 ish and newer, IIRC. It's in the back of the pump on like a 45 deg angle or some such. Couldn't tell you exactly where without looking, and I ain't doing that, too cold outside.

Someone will be along with a pic or diagram I bet.