Injection Timing Help Needed

[GDC]

I finally got my Shenniu 254 tractor back together this weekend(valve job , new head gasket, new injectors, new injection pump, new starter and battery). When i crank it over I'm getting white smoke from the stack but no start. It will start if i spray WD40 down the intake while cranking but it quits after a few seconds. The manual says to adjust the injection timing but offers no procedure. Looking for advice.

Thanks
Greg

 

[greg_g]

Which engine?

greg

 

[GDC]

Greg

Sorry for the delay in responding, between work and computer problems this is the first opportunity I've had. The engine is a 295 and I bought it new back in 1995 from China Diesel (currently Hardy Diesel). I did a search on this site and found references to other brands / engines but not to Shenniu. Are these references still a good place to start?

Thanks
Greg

 

[greg_g]

Well, the manuals that came with my Jinma/KAMA/TaiShan all contained spec and procedure for timing the respective pumps. But unfortunately mine were/are 3 and 4 cylinder engines. If you don't have the engine operations and maintenance manual for your 13 year old tractor, you may have a rough row to hoe here.

Lacking your own manual, best chance would be for another 295 engine owner to jump in here and help. Sorry

//greg//

 

[GDC]

If you don't have the engine operations and maintenance manual for your 13 year old tractor, you may have a rough row to hoe here.

Lacking your own manual, best chance would be for another 295 engine owner to jump in here and help. Sorry

//greg//

I do have the manual, but it doesn't have the procedure for adjusting the IJ pump timing. I'm thinking of marking the timing gear at it's present location and backing off a few degrees to see if I can get it to fire.

Thanks
Greg

 

[doxford jim]

I do have the manual, but it doesn't have the procedure for adjusting the IJ pump timing. I'm thinking of marking the timing gear at it's present location and backing off a few degrees to see if I can get it to fire.

Thanks
Greg

Hi Greg,

It is fairly easy to check the timing on most engines - especially if you have the inline fuel pump.

If you know when you have Top Dead Centre on the engine, you should be able to do it all easily. For TDC you need #1 piston (usually the front cylinder) at top centre, with the valve clearances under both rocker arms.

Once you have TDC, use the graduated markings in the case of the fuel pump where it bolts on to the timing gear casing. These markings will aid you with the timing and are in fact there for that purpose. There should be a long line where the TDC position would be. Try adjusting to around 18 degrees before TDC - that will get you pretty close to what you want. Maybe 15 degrees before would be better. I would guess that the larger groups of lines would be for 10 degrees,with the smaller lines being smaller spacing say 2 degrees or so.

I hope that this makes sense - once you have a look it should all fall into pplace. One thing for sure it is a pretty basic adjustment and there shouldn.t be any real trick to it.

J.

 

[GDC]

Thanks Doxford Jim

I've not messed much with diesels before as far as wrenching goes. So far everything seems pretty simple, but I wanted to make sure I wouldn't screw up the new pump or the pistons by monkeying around in the dark.

Greg

 

[Eagleview]

If the pump has been off , it could be 180* out . You may need to remove it and turn the engine one full revolution , reinstall and follow the steps posted by DJ .

 

[GDC]

I don't believe that it is 180 degrees out as I left the drive gear in place when i pulled the old pump. On this engine, the pump drive gear will not fit through the hole that the IJ pump shaft goes through. Having said that, the pump itself may be out though. It is also possible that the drive gear may have jumped a tooth or so. I will have a go to see what happens.

Thanks
Greg

 

[Eagleview]

That is what i meant , the pump being out 180* . But it is easier most times to pull the pump out of mesh while leaving most things attached and turn the engine over 1 turn to correct (but not in your case as the drive gear may jump a tooth). I think now that you are unsure weather it has jumped a tooth or not you better start from scratch , get your timing gear marks correct and proceed from there . Around 14* for the timing i'd think but check your bible . Do a Google on how to spill time the pump .