454--D179----Surging at high idle, after rebuilt injectors installed

[DN-N-TN]

I replaced all three injectors on my 454, D179, and I developed a surge, or flutter at a high idle. It doesn't do it much at an idle, but I can still hear it some, and it also runs pretty well at high speeds. I rebuilt the engine several years ago, but didn't change the injectors. It has always done real well for forty years, but lately, I got the idea that I'd replace the injectors, since they had never been replaced (my mistake). I installed new injector sleeves in the head, also. I followed the procedure in the service manual, with the right tools. To me it acts like its running a little leaner than before. Do you guys think I might have created the problem with the injectors, or, should I try to adjust the pump timing a little and see what happens. I have been putting out hay with it, but it irritates me. Your response would be appreciated. Thanks, Dennis.

 

[Fritz Maurer]

Is there any white smoke during this fluttering? Will the fluttering go away when a load is put on it?

 

[DN-N-TN]

Is there any white smoke during this fluttering? Will the fluttering go away when a load is put on it?

No white smoke, but it doesn't put out as much black fuel smoke as it did on the old injectors ( that's why I thought it was running too lean). No flutter under a load----it does flutter most time at 1000 RPMs----at times worse than others. It reminds me of a gas engine jetted too small at the main metering jets.

 

[Dieseltech]

No white smoke, but it doesn't put out as much black fuel smoke as it did on the old injectors ( that's why I thought it was running too lean). No flutter under a load----it does flutter most time at 1000 RPMs----at times worse than others. It reminds me of a gas engine jetted too small at the main metering jets.

That pump is hydraulic governed, and the hydraulic head MIGHT need replaced. I'd try advancing the timing slightly first and see if that helps as parts for that pump are made of unobtanium anymore.

 

[DN-N-TN]

That pump is hydraulic governed, and the hydraulic head MIGHT need replaced. I'd try advancing the timing slightly first and see if that helps as parts for that pump are made of unobtanium anymore.

I think I'll scribe some marks on the pump flange and mounting plate as a reference to where it is set now, and like you said, move the timing slightly and see how it does. If I can get it running like it should, I'll mark the location of the pump. I'll then pull the pump and install a new seal kit I've got for it. I've rebuilt CAV pumps, but never a BOSCH pump like this one.

 

[Dieseltech]

I think I'll scribe some marks on the pump flange and mounting plate as a reference to where it is set now, and like you said, move the timing slightly and see how it does. If I can get it running like it should, I'll mark the location of the pump. I'll then pull the pump and install a new seal kit I've got for it. I've rebuilt CAV pumps, but never a BOSCH pump like this one.

The Bosch VA AR, BR, and CR versions are NOTHING like the CAV DPA pumps are and unless one has been to a Bosch service class I would not recommend one take it apart due to the risk of parts damage and Bosch has little to NO parts support for these pumps anymore.

 

[DN-N-TN]

The Bosch VA AR, BR, and CR versions are NOTHING like the CAV DPA pumps are and unless one has been to a Bosch service class I would not recommend one take it apart due to the risk of parts damage and Bosch has little to NO parts support for these pumps anymore.

It's a Bosch VA----thanks for the advice, I'll probably replace the front seal, o'rings and copper washers I can get to without complete disassembly---I'll be very careful not to go too far and damage something. The only experience I've had with any Bosch pumps was F&E schooling in the Army (1968) where I rebuilt Bosch pumps on 1492 CID tank engines. There we had test machines to set them upon and then, install back on the engine to check out our work.

 

[DN-N-TN]

An update on the tractor-----I retarded the pump timing slightly----made it worse-----advanced it slightly from original point, and it runs much better, almost perfect. It seems to have a lot better power than it normally does. I think I'll be satisfied with it now. Thanks, everyone for your comments.