PUMP/TIMING on 826 D,anyone been around these?

John826diesel · Mar 4, 2011

Ok,i'm really getting frustrated with this thing now.. After reinstalling the pump,{the pump shaft wasent turned,nore was the engine when they were seperated}it will barely chug at a real low idle with the shut off cable pulled half way out. I took the bolts out on the gear that runs the pump,but i put them right back in and tightened them down. I also noticed that the dot marks on the gears are 2 teeth off...which i dont understand how that could happen without taking the front cover of the engine off. Also,the slotted holes on the pump gear were cranked to the max in one direction by the previous owner... could this be to compensate for the dots being off on the teeth?? This thing has got me puzzled,even with a shop manual in front of me. Again,any help or advice would be really appreciated!

Janicholson · Mar 4, 2011

Put the timing marks where they belong. Just because a service shop was told not to turn it doesn't mean the twerp that mooved it around or set it in a box didn't turn on it even accidently. Jim

pete 23 · Mar 4, 2011

Those engines have more timing marks on the than carter has little liver pill. Here is what you do. Take the cover off in front of pump, turn engine until the number 6 shows in the lower left hand corner of opening. This will assure you that you are on number one compression stroke. Then turn engine until 16 degrees btdc lines up on front crankshaft pulley. Take timing cover off side of pump and the timing line on pump cam should line up with the bottom of the pointer. Kind of hard to see that line but it is there. . Always back engine up several degrees and turn it up to 16 degrees again in normal direction of rotation after changing pump position. It is possible someone did not assemble timing gear correctly, but if you can get that mark to line up at pump at the specified degree it is good to go.

Charlie ZUthke · Mar 4, 2011

It's been a few years since I had a Robert Bosch rotary injection pump off a german engine. If my memory is correct, I believe, that when you loosen the bolts that hold the drive hub to the drive gear, the injection pump will turn by itself because, as the drive shaft is turned near the start of injection the rollers are starting to rollup on the face cam and when the bolts are removed the plunger return spring will push the rollers back down the cam allowing the injection pump to be out of time.

Now-- about the dots on the idler gear being out of time. The idler gear has an odd number of teeth on it and if you turn the engine over many, many turns, sooner or later, the marks will align themselves again. This type of gear is called a hunting timing gear. Just follow the instructions in the service manual and time the pump correctly and she will run. I would also suggest that you check the timing of injection pump by aligning the correct mark inside the injection pump to the engine, using the marks on the flywheel insted of the front crankshaft pulley. That's my 3 cents worth. charlie

John826diesel · Mar 4, 2011

thanks everyone for the info

Icuby · Mar 5, 2011

I just removed a inj.pump from a 826. I could not see the bottom mark on the pump cam so I set it to even with the top of pointer,scribed location of pump,marked timing gear position and removed pump. I have not got the pump back yet[over 3 weeks] from repair shop to install ,so hopeing that it will be ok after installation.

PUMP/TIMING on 826 D,anyone been around these?

John826diesel

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Janicholson

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pete 23

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Charlie ZUthke

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John826diesel

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Icuby

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